Heaters Blog

Updates and news about Puravents range of industrial and commercial heaters, space heaters, LPHW heaters and radiant heaters.

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Puravent Holiday Arrangement

Everyone needs a break occasionally, and we are no different. To enable a staff holiday our office will be opening on a part-time basis for the 2 weeks between 12th August and 23rd August. Orders will be processed in that period albeit that there may be a slight delay in doing so depending on when the order arrives. Straight forward enquiries will be processed, however more technical enquiries will be answered when we resume full-time operation from 27th August after the bank holiday.

Thanks for your understanding and have a great summer.

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How to stay cool without air conditioning

Cooling Options.

With the weather hotting up we discuss how evaporative coolers work and investigate which of the products on the market are suited to various applications. Traditional split type Air Conditioning machines recycle cooled air within a sealed or semi-sealed environment as allowing cooled air to escape would drastically reduce the efficiency of the process. The heat is transferred to a recirculating liquid which then passes through a heat exchanger outside the building and is dispersed externally.

On the other hand Evaporative Coolers are particularly suited to environments which for one reason or another cannot be sealed or where there is a preference for ‘Fresh’ air rather than recycled air.

How it Works

Mobile Evaporative Cooler

Simplified Evaporative Cooler Diagram.

Mobile Evaporative Cooler

Exhaust exits MUST be provided for both fixed and mobile systems.

The simplified diagrams show how the process works. Fresh air is drawn in from outside the building and passed through a recirculating ‘curtain’ of water (the wet filter). A proportion of the cascading water evaporates into the air stream providing cooling in the same way as sweating cools humans and animals.

The remaining cascading water absorbs an exactly equivalent amount of heat from the air. As a result the properties of the air stream are converted from warm/dry to cool/moist.

Exhaust exits MUST be provided on both fixed and mobile Evaporative Cooling Systems in order to prevent the build up of moisture within the building.

Fixed Evaporative Coolers

Fixed Evaporative Coolers would be permanently plumbed to the water supply and might be situated as per the illustrations below. These show a small number of a wide variety of possible configurations. Internally the cooled air is then ducted to the areas required. These systems draw fresh air from OUTSIDE the building and exhaust humid air from ventilation points around the building.


Top discharge floor mount.

Mobile Evaporative Cooler

Ceiling mounted bottom discharge.

Mobile Evaporative Cooler

Bottom discharge wall mount.

Mobile Evaporative Cooler

Top discharge floor mount.

Mobile Evaporative Cooler

Internal ducting.


Smaller Mobile Evaporative Cooler

CCX4.0 Mobile Evaporative Cooler for large home / small commercial applications.
Mobile Evaporative Cooler

DuraCool Plus with 30 litre tank for domestic applications.

A Mobile Evaporative Cooler draws fresh air from INSIDE the building but humid air must still be exhausted from the building via ventilation points such as windows or open doors. A Mobile Evaporative Cooler will generally have a water tank incorporated rather than being plumbed in to a water supply.

Depending on the design it may be possible to attach a temporarily water supply via a level control system or more usually manual top up of the water tank is required. The DuraCool Mobile Evaporative Cooler has a 30 litre tank and will effectively serve an area of up to 50m2.

The CCX4.0 Mobile Evaporative Cooler for example has a 50 litre water tank incorporated into its base  and would be manually topped up with water (hose pipe or the like). This will effectively serve an area of up to 80m2.

Mobile Evaporative Cooler

Met Mann range up to 15,000m3/hour.

Mid-Range Mobile Evaporative Cooler

Met Mann’s mid-size range of Mobile Evaporative Cooler are manufactured in Spain and are cleverly designed with features to make operation and maintenance easy. Made with the same tough components and superior build quality that are found in fixed units. These Mobile Evaporative Coolers carry a 10 year guarantee for the polyamide top and base, whilst the other components are guaranteed for 2 years.

These Mobile Evaporative Coolers are designed to be a tough long-term asset. Equipped with automatic water tank level control the range offers throughput of 4,200 m3/h through to 15,000 m3/h in 5 sizes most of which are available in either fixed speed of inverter drive options. Weights range from 120kg through to 220kg at the top of the range. All units are supplied with a 25m hose so that the onboard water tank may be connected to the nearest tap/hosetail. Available in 1-Phase and 3-Phase alternatives they are ideal for Large Commercial and Small Industrial applications.

Larger Mobile Evaporative Cooler

Mobile Evaporative Cooler

Master’s BC340 – 30,000 m3/hour airflow.


Mobile Evaporative Cooler

Master’s BC180 – 18,000 m3/hour airflow.

Moving up again in size we near the practical limit for a Mobile Evaporative Cooler. Master’s range includes the BC180 and BC340. The Master BC340 Mobile Evaporative Cooler covers an area of 400m2 and also has automatic water tank level control. At peak output the Master BC340 consumes 15-20 litres of water depending on the ambient temperature and relative humidity of the incoming air.

Having a tank volume of 200 litres it will need topping up only once per 10 hours of continuous peak output. Even so it consumes only 1.1kW of power and so will operate off a single phase, 13 Amp plug. Ideal applications include Workshops, Warehouses and Manufacturing units as well as Greenhouses and Cowsheds.

Help and advice

If you would like to find out more or to get advice on reaching an ideal air circulation system for your application then email us at puravent@gmail.com or call us on +44 (0)1729 824108


Discussion of Unit Heater Types

There are a wide range of Unit Heater Types on the market today. While many are versatile enough to be used in a wide variety of ways, others are designed for niche applications.

Whereas radiant heaters, operating at a very high surface temperature are suited to ‘spot-heating’ applications (of say, a particular workbench) they are not generally a good selection for space heating. In contrast to a radiant heater, Unit Heaters use a fan to produce a high-volume flow of air which distributes the heat generated evenly and efficiently around the environment in which it is installed. Any heater will have limitations as to how widely the heat can be distributed and for larger spaces multiple Unit Heaters may be required.

Although the heat is distributed in almost all cases by an integrated fan, the heat may be generated in a variety of ways. Selection is often driven by the most readily available and economical fuel for the user.

  • Unit Heater Types – Circulating Hot Water Systems

    Unit Heater Types - Hot Water Fed, Wall Mounted

    Wall-mounted Unit heater with hot water feed

    Unit Heater Types - Hot Water Fed, Ceiling Mounted

    Ceiling mounted Unit Heater with hot water feed

    Hot water is generated by a central boiler and is then circulated to one or more low pressure hot water (LPHW) unit heaters. These LPHW unit heaters are used in many applications, such as for heating shop entrances, warehouses, industrial premises, workshops and sports halls. The fans have a low sound level and offer reliable operation. Many have optional ancillary control equipment including electronic thermostat that starts/stops the fan and opens/shuts off the water flow. If heating is not required the fan may continue to run to provide ventilation if required. Multiple unit heaters can be controlled with a single external room sensor and set point adjuster. Some LPHW unit heaters are equipped with drip pans and drains and they can be used for cooling as well as heating.

  • Unit Heater Types – Steam Fed Heaters

    Unit Heater Types - Steam Fed Heater

    Steam Fed Unit Heater

    Some boilers produce hot water but others produce steam. Steam unit heaters are in many ways similar to LPHW unit heaters, however although they have a coil and a fan to blow the air through the coil, the coil itself is of a far heavier construction. The operating principle of a steam unit heater is slightly different to a LPHW heater in that the coil is engineered to make the fluid not only transfer its heat to the air but also to change state. The steam condensing in the coil liberates more heat than just cooling the steam but maintaining its steam state.  The output of steam unit heaters is greater with larger pressure in the steam pipe and the Thermolier steam unit heaters that we supply are ideal for connection to piped steam supplies with up to 10 bar.


  • Unit Heater Types – Standard Electric Heaters

    Unit Heater Types - Standard Electric Heater

    Wall mounted standard electric Unit Heaters

    These basic units range from 3kw upwards and are targeted at the medium sized industrial premises. Models are available for both single phase ands three phase applications. The hot air ‘throw ranges from 9 – 16 metres. To comply with Ecodesign Regulation (EU) 2015/1188 these units must be installed with an external thermostat (such as TAP16R accessory). TAP16R has adaptive start, week program and open window detection.


  • Unit Heater Types – Electric Heaters for Specialised Applications

    Unit Heater Types - Specialised Electric Heater

    Wall mounted specialised electric Unit Heaters.

    Selection will depend on the environment within which the heater is to be applied. The model shown is available in 4 versions. Elektra C is intended for corrosive and damp environments, for example, car-wash halls and sewage works with an outer casing of acid-proof sheet steel, rated IP65.  Elektra F has a low element temperature and is approved for use in combustible areas, for example, joinery workshops and agricultural buildings rated IP65. Elektra V is designed to withstand vibrations on ships and offshore platforms and is approved by Det Norske Veritas. Available for single and 3 phase systems, 50 or 60Hz and rated IP44. Elektra H is designed for rooms with high temperatures, up to 70 °C and is rated IP44.

  • Unit Heater Types – ATEX Rated Heaters

    Unit Heater Types - ATEX rated

    Heater with ATEX rated fan

    These heaters can be installed where potentially explosive gases may be present. They are suitable for Zone 1 and Zone 2 hazardous areas and for gas groups 11A and 11B. They must be mounted horizontally and operated where the ambient temperature does not exceed 40 C. The heaters are stamped T3 and can be used in areas designated T1, T2, or T3. These heaters are widely used in installations such as oil refineries, waste water treatment plants and paint storage areas. ATEX certified with robust 2mm thick epoxy coated steel cabinet, adjustable air direction louvres, over temperature protection, vacuum charged fluid-to-air heat exchanger  and built-in contactor.


  • Unit Heater Types – Oil, Diesel, LPG and Propane Fired Heaters

    Unit Heater Types - Marquee Heater

    Marquee packages can be Diesel, Oil, or Gas powered.

    Unit Heater Types - Duct Adaptor


    These are available in both fixed and mobile designs. For fixed systems it is likely that a large external fuel storage facility would be provided to facilitate economical bulk fuel deliveries. Mobile systems often include a small built-in fuel cell. Mobile systems are partticularly applicable to construction sites where permanent electrical connections are yet to be completed or for ‘Marquee’ events such as temporary concert venues, festival arenas, large weddings and other similar applications. A single heater may be ducted to multiple areas using a variety of duct-adaptors.

    Unit Heater Types - Oil Fired HeaterIndirect Oil Fired Heaters have become increasingly popular in recent years; designed for horizontal or vertical suspension, the units are used extensively in horticultural and agricultural applications, and are often used in conjunction with suspended, perforated ducting, for maximum heat penetration. These units can also be floor mounted, using an optional trolley kit is available to facilitate movement between sites. The pictured unit has an output of 81kW (280,000 BTUs / Hr), with an airflow of 7,100 m³ / Hr.


  •  Unit Heater types – Solid Fuel Heaters

Unit Heater Types - Solid Fuel Heater

Solid fuel Unit Heater

Ideal for industrial situations which produce large amounts of combustible waste. The heater pictured is designed to burn waste wood or logs to produce industrial quantities of heat delivered onto an air flow via its integral heat exchanger. The result is a space heater that looks a bit like a cross between a large wood stove and a conventional ‘bullet’ style space heater. Once installed will provide years of heat from waste wood for the cost of powering the fan.The tube heat exchanger in the top of the heater ensures that once lit, heat can be delivered quickly and easily on the air flow through the tubes. Fitted with a centrifugal fan it is suitable for connection of ductwork, to distribute warmed air to specific locations or even through to adjacent rooms.

  • Unit heater Types – Biomass Heaters.

Unit Heater Types - Biomass heater

Biomass Unit Heater

These are totally self-contained systems which are ideal for space heating industrial type environments. They run on biomass pellets and the pictured range has nominal heat outputs ranging from 43 to 300 kW. Each system has 5 principal parts; The burner housing and combustion chamber; An automatic pellet burner; Control panel and burner programmer; Pellet screw conveyor; Pellet container tank. The combustion chamber with piped exchanger is designed to achieve performances higher than 92%. The pellet container which may be attached to either side of the heater has a standard capacity is 190kg but larger capacity containers are available if required.

  • Unit Heater Types – Cabinet Heaters.

Unit Heater Types - Cabinet Heater

Cabinet Unit Heater

There is a huge range of cabinet heaters on the market with a variety of fuels and electrically driven fans. The pictured heater is in fact oil-fired and is supplied with an integral day-tank and power cord enabling plug-and-play operation in both fixed and temporary applications.


  • Unit Heater Types – Sizing Your System.

Selection of the most applicable size and quantity of Unit Heaters to gain optimum cost effectiveness in any particular situation is complex. There are a number of other variables that contribute to the overall calculation including:-

  • Ambient temperature outside

    Unit Heater Types - Destratification fan

    Destratification Fans will add to Unit Heater efficiency in high ceilinged buildings

  • Materials of construction and how well insulated the building is
  • The efficiency of the heating system
  • The control accuracy of the heating system
  • Fuel preference
  • The height of the space to be heated will determine whether destratification fan(s) would add to overall efficiency

Help and advice

If you would like to find out more or to get advice on reaching an ideal air circulation system for your application then email us at puravent@gmail.com or call us on +44 (0)1729 824108




HVLS Destratification Fans

HVLS Destratification Fans – A Guide

High Volume Low Speed destratification fans (better known as HVLS destratification fans) are able to provide great improvements in working / customer animal environment and better operating conditions for many types of machinery. Due to their whisper-quiet operation (<60dBa) the Evel HVLS destratification fans are applicable across a wide range of environments including for example – restaurants, hotel lobbies, large open plan office places, atriums, warehouses, manufacturing environments and livestock buildings.

What is ‘stratification’ of air?

Evel HVLS destratification fans

HVLS Destratification Fans ranging from 2.5m to 7m diameter are available

Stratification of air is due to the fact that hot air rises, leading to the temperature at ceiling level being higher than at ground level. It is generally accepted that in rooms with stratified air, the temperature differential is typically 2-3°C per 5m height but can be as much as 1°C/m height in some circumstances.  In the worst case, this means that in a 10m high room the difference between temperature at floor level and ceiling level would be 10°C. To achieve a comfortable working environment of say 18°C therefore entails heating the ceiling to 28°C in this circumstance and the higher the ceiling the greater the potential temperature differential, and the greater the likely savings from implementing effective thermal destratification fans.

How do HVLS destratification fans work?

HVLS destratification fans take in the warmer ceiling air and transport it to the floor in a slow-moving column to create a better working environment and greatly reduce total energy consumption. In winter the most significant benefit is a considerable reduction in the cost of heating to create the optimum working/storage environment. During summer months HVLS destratification fans provide low-cost ventilation, reducing or eliminating the need for air conditioning.

When are HVLS destratification fans used?

Evel HVLS Farming 1

HVLS Destratification Fan in use in a livestock application

These fans come into their own in larger applications where there is an economic advantage to using HVLS fans rather than typically up to 7 smaller conventional destratification fans. The increased cost per fan of HVLS fans will be offset by lower installation costs (particularly power and control cabling), lower ongoing operating costs (due to far more efficient motors and responsive control systems) and lower future maintenance costs (due to lower speed and automated, variable speed operation).

Where are HVLS destratification fans used?

In retail or manufacturing situations it is necessary to maintain a comfortable environment to maximise customer enjoyment and / or employee productivity. In high-tech environments a stable controlled environment is required for efficient operation of electronic equipment.

In warehousing it is often necessary to maintain certain air quality standards including temperature and humidity in order to maintain the quality of the stored materials. Similar requirements apply to indoor sports arenas. HVLS destratification fans are ideal for such applications as they are able to respond rapidly to changing environmental conditions.

Enclosed or semi enclosed livestock buildings such as poultry sheds, livestock wintering buildings and cow milking parlours will enjoy the benefits of energy savings and enhanced productivity and improved animal welfare when HVLS destratification fans are put in place.

‘Evel’ range of HVLS destratification fans

All Evel HVLS destratification fans incorporate brushless motor technology with integrated inverter to give optimum efficiency and also allowing remote control and/or monitoring of more complex environments. Fans may be controlled remotely as individual units or may be grouped together as a system and controlled by a central controller.

  • The ‘WD’ range – This range is particularly though not exclusively applicable to the Hotel / Restaurant / Small Commercial markets. These have  5 ‘Selig’ profile fan blades with a diameters of  2.5 – 4 metres rotating at between 160 and 250rpm. These are suitable for ceiling heights up to 7 metres.
  • The ‘WZ’ range – This range is aimed at the Industrial / Large Commercial / Farming markets. These have  5 ‘Naca’ profile fan blades with a diameters of 2.5 – 7 metres rotating at between 38 and 250rpm. These are suitable for ceiling heights up to 12 metres.

Sizing your system

Selection of the most applicable size and the correct quantity of fans to gain maximum cost effectiveness in any particular situation is complex, because there are a number of other variables that conribute to the overall calculation.These include,

  • Ambient temperature outside
  • Materials of construction and how well insulated the building is
  • The efficiency of the heating system
  • The control accuracy of the heating system
  • The actual temperature differential pre destratification
  • The effectiveness of the destratification fans
  • The running costs of the destratification fans
  • The pricing structure of the running cost to your heating system

Help and advice

If you would like to find out more or to get advice on reaching an ideal air circulation system for your application then email us at puravent@gmail.com or call us on +44 (0)1729 824108

Cabinet heater

Confort Cabinet Heaters Evolve

The oil-fired Confort cabinet heaters range has been revised.

Confort cabinet heaters - Old style

Confort cabinet heaters – Old style

Confort cabinet heaters - new style

Confort cabinet heaters – new style

The original Confort range of oil-fired cabinet heaters were notable when they first arrived 3 years ago because they had an on board oil tank which meant that the hassle and expense of installing a piped connection to a bunded fuel tank was avoided.

The new range also has an on board tank but the tanks are bigger and much more part of the heater as opposed to sticking on the front of the unit. Old Confort cabinet heaters or new revised range, the main feature is the same – they are as close to ‘plug and play’ as it is possible to get with a cabinet heater. The relative ease of installation and their small footprint make them ideal for numerous industrial applications, such as workshops, industrial units, car showrooms and more rustic retail outlets.

Previously, the Confort range featured the 1G and 2G models, which gave a heat power output of 31kW and 61kW, respectively. Looking at the new 35, 70, and 100 models, they give a heat power output of 35kW, 70kW, and 100kW, respectively. The new range offers an extra model at the top end and greater output across the range.

Confort Cabinet Heaters Compaison with the old range

Take a look at the table below for a further comparison and what the new models have to offer:

Old models New models
Rated heat power [kw] 34.8 69.8 34.76 70.78 100.48
Output heat power [kw] 31.3 62 32.64 65.96 93.65
Heat efficiency [ % ] 90 90 93.4 93.2 93.2
Air flow [ m3/h] 2400 4 2.7 6 7.8
Available static pressure [ mm H2O] 10 10 15 15 15
Fuel consumption [kg/h] 2.93 5.88 2750 5600 7950
Tank capacity [ l ] 65 65 70 110 110
Power consumption 230V [ W ] 677 1550 680 1350 1750

A further comparison shows a few extra features …

The old 1G/2G models The new 35/70/100 models
X ERP compliant
X Electronic flame control
Built-in room thermostat (+5°/+30° C) Built-in electronic room
thermostat (0°/+40° C)
FAN-LIMIT bi-thermostat with manual reset FAN-LIMIT bi-thermostat with
automatic and manual reset
Air outlet head with adjustablelouvres, revolving at 360° Option for air outlet head
with adjustable louvres,
revolving at 360°, or a static plenum
box with output of 360°
Summer-winter switch for use as a fan X


The new style of control pad on the Confort cabinet heaters range

The new style of control pad on the Confort cabinet heaters range

Old style Confort cabinet heaters with  knobs and switches

Old style Confort cabinet heaters with knobs and switches

Cosmetically, the design and look has received a major upgrade. The new models move away from the white and red to a more industrial looking metal-grey.

Functions are now controlled with touchpad buttons which give a much newer look, compared to the switches and knobs on the older models.

Overall, the new models bring a fresh look and more powerful performance to the Confort cabinet heater range. If you have any further queries on the units or their applications, please contact our UK based office on 01729824108, or at info@puravent.co.uk


Spot Heating with FireFlo FFHT32 Ductable Fan Heater

New to the market from September 2018 is Broughton’s new FireFlo FFHT32 industrial ductable fan heater. This heater is capable of ducting long distances and delivering high volume airflows with a differential temperature of 75°C. Built to withstand the knocks of day-to-day site use, the FFHT32 is ideal for use in factories, spot heating applications, and events.

Spot heating: Introducing the New FireFlo FFHT32 industrial ductable fan heater

The FFHT32 spot heater features not only an on board thermostat but also a remote thermostat. Simply plug in the remote thermostat and that disables the on board thermostat.


  • Heat capacity 18kW
  • 32A 400V 3ph supply
  • 960m3/hr Airflow
  • 75°C Temperature rise though the heater
  • Ductable to 10m
  • Two Heat Settings
  • On board thermostat (0-40°C)
  • Includes remote ‘plug in’ thermostat (0-40°C)
  • Square to round adaptor

Overview of applications

Spot heating is a bit of a niche area in the industrial heating market but these heaters do find a number of applications. One such use is the pre-heating of raw materials before handling and use in production processes.  In these type of operations the FFHT32 would be ideal for delivering and circulating warm air between and around the containers of the raw materials, eliminating the need for heating belts and the associated wires trailing around the room and less work on handling the drums. A non-invasive method to evenly heat the contents. Another ideal application would be for delivering hot air into process applications such as might be found in production lines and drying tunnels.  Brilliant for delivering hot air for drying or curing various coatings and adhesives or prewarming raw products as they are transported down the line.  The FFHT32 is a well designed, portable, yet durable spot heater that is easily deployed for use in the a wide range of applications.

Old vs. new: FF29 and the FFht32

Spot heating: Introducing the New FireFlo FFHT32 industrial ductable fan heater

Specs Spot heating: Introducing the New FireFlo FFHT32 industrial ductable fan heaterFF29 Spot heating: Introducing the New FireFlo FFHT32 industrial ductable fan heaterFFHT32
Airflow rate 2034m³/hr 960m³/hr
Fan type BC impellor Axial
Heat output 14.5/28.9 kw 12kw/18kw
Max Delta T 55°C 75°C
Max duct length 20m 10m

Both heaters excel in their own right. The FF29 will always stand out, with its high airflow rate and heat output. However, the FFHT32 brings new capability to the field, with an outstanding temperature lift and a new axial fan.

In short, if you are looking for a space heater then the higher heat output and airflow make the FF29 is the better bet, but if you are looking for a spot heater solution then the FFHT32 is a winner.



Suitable for Bed Bugs?… A Qualified maybe.

It should be noted however, that despite the high differential temperature the FFHT32 is not suitable for ‘in room’ bed bug treatment although it is ideal for ducted hot air supply into rooms being treated. In order to use it for bed bug applications it would need to be used in conjunction with a higher range remote thermostat which is not yet an offering.

If you have any queries on the heater or its use in certain applications, please contact our UK based office on 01729824108, or at info@puravent.co.uk

industrial building

Heating Industrial Workplaces

The Inside Track On Heating Industrial Workplaces

The temperature of heated industrial workplaces has a bearing on some aspects of health and safety, but also on productivity, the integrity of the building and indeed, whats inside it. It is not law, but it is widely recognised that workers perform best between 16°C and 24°C, depending on what kind of work is being done. Higher physical activity levels, i.e. manual labour, is performed best at lower temperatures and incurs less risk of heat related stress. Conversely office work and fine, dexterous work will require a slightly higher temperature.

According to the Chartered Institute of Building Services Engineers, (CIBSE) different working environments require differing temperatures. For example:

  • Heavy work in factories: 13°C
  • Light work in factories: 16°C
  • Hospital wards and retail: 18°C
  • Offices and dining rooms: 20°C

In addition to the obvious consequences of not enough heating, occasionally there are instances of badly specified, designed or poorly controlled heating resulting in overheating, where issues can include low levels of employee concentration, dizziness, fainting, or even heat stroke. This oddity can arise where the fabric of an old building has been upgraded to modern standards but the old and consequently over sized heating system retained.  Apart from the social consequences, carbon footprint and energy costs will be far higher than required. Not only can this be attributed to the use of the wrong heaters, but also lack of proper heater control as well as poor ventilation and air circulation.

Types of Heating

Gas fired

Direct Gas Heaters

heating industrial workplaces gas fired heater

Arcotherm GP105M 108kw Direct Gas Fired Heater

Direct gas heaters are useful for heating workplaces with large open spaces, such as warehouses and industrial site environments. To use mobile gas direct fired heaters, sufficient ventilation of the room is essential to prevent a deficiency in ambient oxygen levels, and to prevent humidity levels getting too high. Direct fired gas heaters have been traditionally used to heat workshops, warehouses, construction sites and foundries, and for many years have been the automatic choice of the hire industry.


Indirect Gas Heaters

indirect gas heaters

indirect gas heaters

These heaters have the added ability to dry buildings during construction, or after flooding, by pumping large volumes of warm, clean, dry air into the space without increasing the relative humidity of the workplace – indeed the %RH will fall as the temperature is increased. With all the convenience of easy mobility but without concerns about ventilation and oxygen supply, these mobile indirect gas heaters are a very versatile way of delivering larger volumes of hassle free heated air into marquees, building sites, industrial and agricultural buildings.

Fixed Gas Radiant Heating

Gas Plaque Heater

Gas Plaque Heater


With remarkably fast warm up times gas plaque heaters are really useful for heating industrial workplaces. They tend to find their application in industrial buildings where the heating requirement is more ‘occasional’ than ‘full time’. There are various small portable products up to about 36 kw which are fuelled from bottled gas, and also fixed plaque heaters which can run on natural gas. The nature of these heaters is that they create CO2 so as with direct fired heaters, there is a requirement to ensure that there is sufficient ventilation to ensure that there is no build up of CO2 and humid air.

Oil Fired Heaters

Indirect Oil Fired Heaters

vwigm_ec32-1 These are most commonly used in the marquee / event / temporary structure industry to provide clean, dry, thermostatically controlled heat inside the structure, with the heater standing safely outside. They are also widely used in construction, horticulture and agriculture and for general space heating.

heating industrial workplaces

Arcotherm EC32 indirect oil fired heater

The Arcotherm indirect heaters are a popular choice for marquee applications where it is important to control the temperature to a pleasant setting to ensure that guests are comfortable. Heaters such as halogen heaters, patio heaters, cabinet heaters, and table heaters are not suitable for the application as neither have internal fans, and in addition can pose a trip hazard due to trailing power cables. The Arcotherm heaters however, are placed outside and out of the way, leaving a clean aesthetic feel inside whilst providing warm, clean, dry air into the space.

Electric Heaters

heating industrial workplaces

Elztrip EZ20831 800w 400V ceiling (3-10m) mounted radiant heater

Radiant Electric Heaters

Industrial radiant heaters are ideal for applications where rapid warm up times are required and open buildings require zone heating that would be impossible with space heating technologies. Smaller portable radiant heaters are available in both 230v and 110v, whilst for installed radiant heaters there is a choice of ceiling and wall mounted heaters. Electric radiant heaters are even available for mounting heights up to 20m – ideal for high bay loading areas and covered yards.  However, the application is most suited to just heating specific work areas within a larger, relatively cold building. Radiant electric heaters also provide a rapid warm up time which can make them an ideal choice for buildings that get occasional use e.g. commumity halls.


Frico Elztrip Heaters in a Hot Yoga Application

Electric radiant heaters find an ideal application in Hot Yoga studios. Radiant Heating for Hot Yoga places significant demands on a heating system because not only does the heating system need to be able to bring the temperature up to around 40°C. It also needs to be able to maintain that temperature within a relatively tight control band. The best heaters to meet the demands for temperature and of controllability are ceiling mounted electric radiant heaters. The Frico range includes a model called Elztrip which has the advantage of having a clean white finish, which suits a studio environment. Levels of controllability are enhanced with a control system where the power to the radiant heaters is rapidly pulsed on and off, and where the duration of the off and on parts of the cycle are altered to suit the temperature resulting in a much smoother temperature control especially when compared to a basic thermostat.

Electric Fan Heaters

Tiger fan heater - ideal for heating industrial workplaces

Tiger fan heater

Industrial electric fan heaters bring the advantage of readily portable, easy ‘plug and play’ to heating industrial workplaces. There is a huge range of types and capacities. Some smaller ones are 230v or 110v, whilst larger ones are 415v 3 phase. Some are built to be ductable, allowing warm air to be directed to where it is need, possibly a drying process or into a room.  Some are wall mountable and have variants that are designed for dusty environments or very wet or corrosive environments or for creating hot environments. But the overall, industrial electric fan heaters are all about cost effectiveness and versatility.

The Tiger range of electric fans heaters, for example, has ratings between 2 kW and 30 kW, each with on board thermostat control. The fans are ideal for use wherever temporary but effective heating is required, such as on building sites, in warehouses, workshops, shops, exhibition halls, assembly halls and garages. You can even attach them to a wall.



LPHW Heaters

heating industrial workplaces

Frico SWH02 12kw LPHW fan heater with intelligent control

Low pressure hot water (LPHW) is a flexible means of distributing heat to various zones or parts of a building. In a commercial or industrial setting, LPHW fan heaters or LPHW radiant panels are used and can be easily connected to the piped infrastructure. A piped LPHW system is a long-term investment – part of the building. The heat source (boiler, heat pump etc. ) and indeed the heat emitters (fan heaters, radiators, radiant panels etc) are easily changed and upgraded from time to time, when required.

LPHW Fan Heaters

Where heat is available in this form then the use of LPHW unit heaters fed on hot water is invariably the most cost-effective and indeed versatile method of space heating a room or building.  LPHW is ideal for all commercial and industrial applications: retail outlets; leisure centres; exhibition halls; warehouses; factories; garages; workshops; plant rooms.

LPHW Radiant Panel Heating

recessed LPHW radiant panels

Ceiling recessed LPHW radiant panels

Heating industrial workplaces with LPHW can also be delivered in the form of ceiling mounted LPHW radiant panels. They create a clean look and come in various sizes to suit a variety of commercial and industrial workplaces.  They can be fitted within a suspended ceiling grid or suspended from a solid ceiling. The effect is that the heater blends to be part of the ceiling and it is very clean and neat. No surprise that this variety of radiant panel heaters are popular in schools, municipal buildings, and commercial spaces.



suspended LPHW radiant panels

Suspended LPHW radiant panels

Suspended LPHW ceiling panels are seen when the ceiling is the roof line and particularly where the roof itself is a feature of the building, these radiant panels can add to the effect. Without the constraints of a ceiling grid they are available with a wider array of widths and again come in various lengths.  All ranges have a system of jointing that ensures that panels can be combined to form a seamless run. These type of heaters are normally used in larger rooms such as sports halls and assembly rooms, and often feature ball covers to prevent balls getting caught on the top of the heater. This type of heater is also becoming increasingly common in ‘clean’ manufacturing settings.




Steam Heaters


123L-S-H steam 13.2kw fan heater

Steam, which is often viewed as a means of powering the industrial past, is in fact still a feature of some of the larger industrial buildings. Where there is a steam infrastructure there are two heating options – fan heaters and radiant panels.

Steam fan heaters

Thermolier fan heaters are an industrial heating stalwart and are widely used on steam applications. Efficient heat transfer from steam to air and strategic placement of the heaters gives exceptionally fast warm up and practical heat control in large spaces. Requiring little or no maintenance, these heaters are tough and efficient, and are typically hung from the roof structure of from wall mounting brackets. There are vertical airflow versions available which are suited for mounting in the mid area of large buildings away from walls, where they can provide destratification as well as heating.

steam radiant heater
steam radiant heater


Steam Radiant Panels

Steam radiant panels are a niche line but can be useful in providing heat in zoned areas where the expense of putting electrical ATEX certified equipment is prohibitive. Depending on the heat requirement and steam pressure available in the pipework, we can work out the most cost-effective sizes and array of steam radiant heaters to deliver that requirement.


Drum heating: 6 Tips for Preheating Raw Materials

When looking at drum heating barrels of raw materials, there are a number of different methods and a bit more to it that meets the eye. Here are our drum heating tips.

 6 tips on pre-heating raw materials

  1. Choosing what heating method.
    – A belt drum heater is a common way to provide viscosity control, freeze protection, and melting of solids and maintaining materials at high temperatures.

    Belt drum heater

    However, it is not always possible to apply a belt across a drum as sometimes they are placed too close together or it just won’t reach. Furthermore, having trailing wires and the process of covering an uncovering barrels can become time-consuming.  Although in some cases it is a workable solution, it is not a ‘silver bullet’ solution for all drum heating problems. It could become expensive depending on how many barrels need to be covered. Belts do however use the barrel as a conduit of heat which means that heating is gentle and, to an extent, even.

    Cartridge ‘stick’ heater

    – A cartridge heater, a less common way to approach drum heating, is dipped into each individual barrel. This can create numerous problems. The process of opening up each barrel to dip the heater in invites oxygen and air into the drum, which could spoil the contents. The limited surface area of the heater means that to get effective heating performance the surface temperature may be become considerably hotter that the liquid being heated particularly if the heat can not quickly move through the barrel contents. If not controlled closely the heater can get sufficiently hot to adversely affect the contents. Furthermore, the barrels cannot be stacked as the top of the drum needs to be accessed and kept clear for the heater. With numerous barrels being heated the a tangle of wires is an ever-present likelihood.

    Radiant heating. This would typically involve heating the barrels using mobile radiant heaters. Not a bad idea but it still involves treating each barrel in turn and it relies on the skin of the barrel carrying the heat evenly to the contents. However, unless you heat from at least two directions there will be a cold shadow area on the drum, and the contents will warm unevenly.

    Heating the room involves less handling of the barrels, and has the advantage that there is no equipment specifically for each drum. Used in conjunction with fans that circulate air between and arround the drums and building insulation to minimise heat loose, each barrel’s surface area will be warmed gently and evenly heated. No need for wires trailing around the room and no need for the handling of each drum to put on and take off a belt, and a non-invasive method to evenly heat the contents.

  2. Finding the correct heater for your application.
    Depending on your desired nominal room temperature, finding the right heater is key. For a room needing to be at a hotter setting, a ‘high temperature’ heater is required. Normal temperature heaters are typically controlled from an onboard thermostat that is ‘comfort range’ meaning that it will have a setting range from say 5°C to 30°C or 35°C, which is obviously no good for getting a room up to say 60°C. Even if you disengage the thermostat, there are more problems – an overheat cut out will as likely as not start tripping if the heater elements compartment gets to 80 or 90°C, which it most definitely will if the heater is left to run. Bypassing the thermal cutout will then leave you with problems such as component failure and potential fire risk. So the short cuts aren’t worth the risk when it comes to your drum heating  by space heating a warm room.
  3. Insulation is key.
    As mentioned earlier, minimising the influence of the outside temperature is the most critical factor in achieving and maintaining the desired indoor temperature for drum heating. The best high-powered heater may be wasted if the heat generated escapes the room before the desired temperature is reached. Remember that the greater the difference between the inside temperature and outside temperature the more the heat will be inclined to pass through the wall. In other words, for warm room applications where temperatures are greater than normal room temperatures, insulation is even more critical. Moreover, lack of insulation is the number one reason why a ‘high temperature’ heater will not elevate a room  to the set temperature.In technical speak – you want the room to reach the desired temperature before it reaches the ‘thermal equilibrium temperature’. You influence the ‘heat in’ by your choice of heater and you influence the ‘heat out’ by your rooms insulation. The more heat in (control issues aside) and the less heat out, the higher is the thermal equilibrium temperature, where heat in and heat out are equal.
  4. Keeping moisture at bay.
    Desiccant dryers are no stranger to storage and drying applications, but they also can play a role in drum heating. When drums are in storage at whatever the ambient temperature happens to be, it is often desirable to prevent corrosion on the drums, and for thisa desiccant dryer is ideal. They work efficiently at low temperatures but when the heaters are turned on to elevate the temperature and the dryer can be switched off, it means that the heating process is more efficient because the air in the room is already relatively dry.

    V flo fan for air mixing in warm rooms

    V Flo fan for air mixing in warm rooms

  5. Take the drums off the floor.
    A simple yet overlooked advantage to keeping an even temperature of the barrels is to place them on a pallet to ensure warm air can reach every part of it. This allows and extra level of air circulation to ensure there are no cold spots within the drum and maintains an even warmth.Keeping air circulated.
  6. Move the air about.
    Through the use of ceiling fans, air movement ensures that warm air can be evenly distributed around the room, reaching all corners within the room. Assuming the drums are on pallets, the use of ceiling mounted V flo fans is perhaps the best way of distributing the heat and thus avoiding areas with stagnant air.


Range of High Powered Heaters to Help with your Drum Heating

drum heating

Elektra high temperature heater ranges to 70°C

drum heating

Broughton FF3HT-15, a 3kw fan heater has an external thermostat that ranges to 60°C

drum heating

Fire-Flo heaters all have thermostats to 40°C

drum heating

KillMann high temperature electric hot air heater can generate an adjustable thermal difference between 20 and 120°C

For more information on what unit would suit your application, or for any other questions regarding our range, please see our website, or call our office on 0845 6880112

Jumbo heaters

Jumbo Heaters Even Better Than Before

jumbo 145M diesel fired mobile heater

Jumbo Heaters – A long-established stalwart of the hire trade and in marquee companies gets a make over.

New Range of Jumbo Heaters

Jumbo Heaters, which have been a mainstay of the Puravent heater range for years, have had a bit of a make over. The old range which was composed of the 115, 150 and 200 models has been superseded. The new range has a 5 model line-up and now has Jumbos 85M, 110M, 145M 185M and 235, with nominal rated outputs of 85kw, 110kw, 144kw, 185kw and 235kw respectively.

Here at Puravent we always thought that the range of Jumbo heaters were pretty good, but apparently there was room for improvement. With a larger number of models an a wider range of options, the new range ticks a lot of boxes.

The new Jumbo heaters look  good from any angle

The new Jumbo heaters look good from any angle

Jumbo Heaters Protection

The Jumbo indirect diesel fired heaters have been updated with a box frame chassis. New body features lifting eyes and bumper rails to protect the vitals. The box frame chassis allows the body panels to be removed for inspection of the heaters innards and for easy cleaning.

And the body panels are not just tin trays.  They have been stiffened with cross braces to add further rigidity to the heaters and to offer more protection from handling impacts. The burner is now much better protected and enclosed in a box that has an over reaching bumper bar above. Likewise, the inlet fan is protected not only with a grid over the impeller but a bumper round the motor. The controls are securely protected by a steel protective box to prevent tempering and  to guard against damage to the switch gear.

jumbo 85M diesel fired mobile heater inlet side

Jumbo heaters have the controls in the protective steel box and the fan motor is protected by a bumper

Jumbos Like Rain

The electrical control gear that lurks in the protective box is IP65 protected. It really does not matter what the weather is doing outside, the Jumbo will keep on sending the warm air inside. And the fan is IP55.  This means that it is ‘dust protected’ as well as protected against water ingress to the extent that it is protected against  ‘heavy seas’. From the IP coding descriptions you could easily deduce that the Jumbo heaters are suitable for use in a ship.

Jumbo Heater Puffer

The fans on the range of Jumbo heaters are 7 bladed axial units which have been chosen for their low noise characteristic. The fan on a Jumbo heater will deliver 200Pa . This is enough to push the warm air along flexible ducting to where it is needed, and it will still only generate 67db of noise at 2m. The bumper bar that protects the fan motor is detachable. When it is removed it enables the fitting of an inlet ducting adaptor. With an adaptor, flexible ducting can be fitted to the inlet of the fan. This enables the heater to reheat air that has been returned from the room or building. Compared to just heating fresh air, this facility of re heating the return air ensures that running costs are kept to an absolute minimum.

 Jumbo Heaters Extra Bits

But it is the accessories that make the Jumbo a winner. Each of the 5 models in the range comes with a single outlet duct connector and a tiger loop on the oil supply side. The tiger loop prevents air pockets interrupting the fuel supply. In addition, there are optional bits and bats including a twin duct connector or ‘splitter’ as they are sometimes known. On the larger models there is even an option to have a 4 duct connector outlet.

jumbo 85M diesel fired mobile heater single outlet adaptor

Single duct outlet

jumbo 85M diesel fired mobile heater two way outlet adaptor

Twin duct outlet

jumbo diesel fired mobile heater 4 way outlet adaptor

4 duct outlet

jumbo 85M diesel fired mobile heater single inlet adaptor

Inlet duct adaptor


Operation Of The Jumbo Heater

jumbo 85M diesel fired mobile heater operation

The Jumbo is indirect fired so the combustion gases are exhausted to the flue, whilst the air is warm and clean.

The Jumbo heaters have a similar internal layout to other heaters of their type. It is interesting to note, however, that the new Jumbo heaters are more efficient than the outgoing models. This suggests that the new range has some improvements to the design and construction of the burner and heat exchanger. The new models all return a thermal efficiency of at least 92%.

What’s not to like?


About 50Hz And 60Hz Machines

50Hz or 60Hz?

The majority of power outlets across the world operate 50Hz (220–240 V), ranging from majority of Europe and Asia, Africa, Australia, Russia, and South-Southern America. However, Northern America, and Nothern South America, operate a frequency of alternating current at 60Hz (100–127 V). To most, this is not new information, but how many can actually answer- why the difference?

The waveform of 230 volt, 50Hz compared with 110V, 60Hz

The waveform of 230 volt, 50Hz compared with 110V, 60Hz

When looking at the choice of grid frequency (assuming both voltage levels are the same), there can be seen to be no particular major advantages between either frequencies, with both being quite similar from an electrical perspective. Where they differ, however, is from a design perspective. Simply, 60Hz supplied to a motor makes it rotate faster compared to it being supplied by 50Hz.

It used to be easy, insofaras machines with motors would be able to work on either 50 or 60Hz, however as electric motors have developed over the years to become increasingly efficient, it seems that they are also more fussy about the frequancy or the supply. These days a machine that can run on both frequencies is a rarity and it is typical that they either run on 50Hz or 60Hz, but not both.

Historical Influences

Choices over frequencies does however have historical reasons. Early on in the history of electricity, the norm was set with Thomas Edison’s General Electric company distributing direct current (DC) electricity at 110 volts in the United States (U.S). With this, Nikola Tesla introduced three-phase alternating current (AC) at 240V. This allowed for three slightly out of phase alternating currents (AC) to combine and even out great variations in voltage occuring in AC electricity. With this, Tesla conclued that 60 cycles per second (60Hz) was the most effective frequency. However, due to safety reasons, reduced the voltage down to 120V. With this, 60Hz became the standard for the United States and Americas.

Over in Europe, German company AEG invested in generating electricity at 120V/ 50Hz instead of 60Hz to better fit their metric standard, and the result became the norm in mainland Europe. Post World War II, Europe switched to 220V for better efficiency in electrical transmission, and simulatensously, Great Britain changed from 60Hz to 50Hz to follow the European lead. What could have been an expensive switch-over was averted because few people possessed electrical appliances at this stage. However, at this stage a large portion of U.S consumers possessed electrical appliances and such a switch-over would not be viable. A comprimise was concluded with 240V being able to be introduced to a house where it could be split to 120V to power most appliances, whilst certain household appliances such as the electric stove and electric clothes dryer, would be powered at 240V.

Today, there are still a small minority of countries split between the two. For example, all of Japan runs on the same voltage, however the frequency differs from region to region. Eastern Japan (including Tokyo), uses 50Hz after purchasing electrical generators from the German company AEG in 1895. A year later, American company General Electric, provided 60Hz generators for cities in western Japan (including cities such as Osaka and Kyoto).

electricity_map jap

Japan’s (in)compatable power supply grid

Brazil faces a similar situation- despite the country running primarily on 60Hz, most states run between 110V and 127V AC electricity, whilst the northeast of the country run 220-240V (along with majority of the hotels spread all over the country)

Interested in products catered to 60Hz?

There seems to be a slight bend in the rule however. Majority of offshore vessels and platforms run off 60Hz, no matter where they originate or are manufactured. Ranging from oil rigs in the North Sea to the ships deployed by the Royal Navy (*excluding DC ships*), most of these run off 60Hz. The offshore market for 60Hz fans and other 60Hz machines has ensured that we have adjusted our product range to meet this requirement.

Here is a highlight of some of the products ranging from 60Hz fans, 60Hz fan heaters, 60Hz basket fans and 60Hz recirculation fans. The range of 60Hz that are either available in a 60Hz variant, or can be built to order for connection to a 60Hz supply.

60Hz fan options and 60Hz fan heaters available from stock

DVG-T/H Roof 60 Hz Fan

DVG-T/H Roof 60Hz Fan

DVV-EX Roof 60 Hz fan

DVV-T Roof fan

AJR jet 60 hz fan

60Hz AJR jet fan

BF-W Wall mounted 60 Hz fan

BF-W Wall mounted fan

Elektra 60Hz fan heater

Elektra 60Hz fan heater

Panther wall mounted fan heater can be supplied with a 60Hz fan

Panther wall mounted 60Hz fan heater

130cm basket 60 Hz fan

Vostermans Basket fan

Multifan Recirculation 60 hz fan

Multifan Recirculation fan

vflo fan available in 60hz

60Hz V FLo fan

water fed fan heaters available in 60 Hz

60Hz LTHW Unit Heater

AXCBF-EX ATEX certified bifurcated medium pressure axial 60 Hz fan

AXCBF-EX bifurcated axial fan

Multifan Tube mounting 60 Hz fan

Multifan Tube mounting fan


Machines which can be built to suit 60Hz supply

VRF range of desiccant dehumidifiers can be built as a 60Hz version

60Hz VRF Desiccant dehumidifier

MCM air conditioners are available in 60 Hz

60Hz MCM air conditioner

AD range of evaporative coolers can be built as 60Hz verions

60Hz Evaporative coolers


With that in mind, if you have any questions on purchasing a product that runs on 60Hz from this list or more from our range, (including its application), contact our specialists at info@puravent.co.uk or call our UK based office at 0845 6880112.




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