The team at Puravent very much hope that you are managing to keep clear of the dreaded Covid-19 and are coping as well as can be expected with the ‘new normal’.
During this testing period of lock down in the UK we have changed our operation and would like to emphasise the following points;
Puravent is operating remotely for the duration of the lock down. Enquiries by phone by phone and email are welcomed…
– Our office number is on divert to a home land line, or you can phone my mobile 07966 107944.
– The various enquiry functions and the ‘contact us’ page on the website continue to work as normal.
– Emails to firstname.lastname@example.org are answered picked up as normal.
Most of our supply lines are still operating albeit that in most cases the operations are scaled back and as a result are operating a little slower than normal.
We can still supply the vast majority of the products that are listed in the Puravent website although in some cases the delivery may take a bit longer than advertised.
Before ordering, please contact us to confirm the stock and lead time on the items you require.
Thank you for taking the time to visit our website and your interest in our products.
Coronavirus – Service Update Letter was last modified: March 31st, 2020 by Bill Anderson
Electric wall mounted industrial fan heaters don’t perhaps get the attention they deserve. Shame because they are a very easy and effective way of heating smaller working environments.
When most people think about wall mounted fan heaters, what comes to mind is a small domestic 1.5kw or 2kw unit with a pull string, whereas we like to think a bit bigger. In fact we don’t do domestic ones, only industrial wall mounted fan heaters where they can easily be large enough to deliver 30kw of heat.
Advantages of wall mounted industrial fan heaters versus a portable fan heaters?
Whatever the size of wall mounted fan heaters their great advantage is that they are easily installed and once on the wall and connected up, they are out of the way. Although there are plenty of different models of portable heaters, and some of them excellent, there is the ever present power lead and the chore of moving it out of the way when you need the bit of floor that it is on, for something else. Whereas portable fan heaters tend to get moved around for best effect on work areas within in larger buildings, wall mounted fan heaters are better for whole room heating in smaller working environments. This means that in workshops, small industrial units, laboratories, shops, consulting rooms and the like, electic wall mounted fan heaters are ideal.
Wall mounted industrial fan heaters – single phase
A conventional 230 v single phase electricity supply is a little limited for the purposes of heating work environments. In broad terms 230v supply limits your choice to heaters that are not much bigger than 3kw. Whilst this may be ok for very small applications, once your heating requirements demand multiple 3kw heaters, you will very quickly run into limitations on the capacity of the power circuit that you might have been planning to plug the heaters into. When faced with this limitation many customers investigate the costs of installing a 3 phase supply.
Wall mounted industrial heaters – 3 phase
As with any other electic heater type the availability of 3 phase supply opens up the potential options hugely, compared to single phase. For most industrial environments where there are electrically driven machines 3 phase is not a problem, all the machinery will operate on 3 phase and the 3 phase circuits will be in place. The existence of 3 phase not only opens up the range of heaters available but also the range of heating capacity that is available and with up to 30kw generally being the upper limit on 3 phase wall mounted heater capacity. With that size of heater available there is scope to heat really quite large industrial and commercial working environments using these heaters, but in reality when the application size is of this size running costs have much more impact and tend to outweigh the electic wall mounted heaters ease of installation and modest capital cost.
Industrial wall mounted industrial fan heaters for challenging environments.
Many working environments are challenging to heat because of dust, vibration, damp or corrosive atmospheres. The easy availability of wall mounted fan heaters specifically designed to be compatible with these type of environments make this type of heating an easy option and more attractive than more complex and expensive alternatives.
For these difficult applications we tend to look first at the Elektra range of heaters. These heaters can be either wall mounted or free-standing – the bracket doubles as a stand when on the floor, and there are sub ranges suited to damp environments/ vibration/ dusty and fire risk environments and for producing elevated heat levels. The Elektra heaters are well certified and versatile
The way the Elektra heater range works is as follows.
Investing in destratification fans pays back instantly in terms of worker comfort also pretty quickly in terms of £££s as its puts an end to wasting heat and energy. Destratification fans can be retro-fitted to almost every workplace with immediate benefit.
Frico 9kW wall mounted fan heater
We recently quoted for a couple of Frico 9kW unit heaters to a client to heat his small manufacturing unit.
We also quoted for a thermostat to control the heaters and help to minimise his energy bills.
Airius destratification Fan
To complete the offering we quoted for a small Destratification Fan to further minimise the bills by returning rising hot air from the ceiling of the factory to the working area (i.e. where the people are).
The client went ahead and bought the heaters and thermostat but did not proceed with the Destratification Fan.
A few weeks later we got a message to the effect that the heaters were working flat-out, the ceiling space was toasty (wasting heat and energy), but the workers were still cold! After some discussion the client decided to buy and install the Destratification Fan albeit with a little scepticism.
Today we got the following message and photographs…..
Two heaters and a destratification fan in use in a small manufacturing unit
You will be happy to know that the Airius 15 destrat fan is working a treat !
Heating is actually switching off now. Fingers crossed the bills reduce too.
Appreciate the help and advice. Attached photo which you can use if you want.
…and here is the photo they sent, with the two heaters wall mounted with isolator switches towards the right of the photo and the fan hanging from the ceiling joist near the centre.
We have hundreds of heating and ventilation options available on our website so if you require any assistance please do call us to discuss your requirements on 01729 824108. Alternatively email through your enquiry to email@example.com or follow us on Facebook or Linked In
Are you Wasting Heat and Energy? was last modified: February 13th, 2020 by Bill Anderson
To achieve biologically and, or chemically clean air, UV air purifiers are the answer. In this post we reproduce (with minor updates) our article that was originally published in MBS magazine in 2008. It is as relevent now as it was then. In the meantime if you need help with engineering a system based on UV air purifiers then call us 01729 824108 or our UV products are here.
“In North America, UV air purifiers for preventing fouling on cooling coils and drip pans and for the treatment of odours and micro organisms in ducted air has been common place for 15 years or more. Not only is the technology a specified requirement for air handling units entering service within American public sector buildings, it has even been tested and found to be effective by the US National Homeland Security Research Centre, at defending building occupants against bio-terrorism. Now that the technology is detailed in the ASHRAE handbook, it warrants closer examination in Europe.
Technical Rudiments Within the UV light spectrum, the wavelength 254nm is known to be particularly effective at killing or inactivating micro-organisms. It is utilised by ultraviolet genocidal irradiation (UVGI) systems, where the effect on micro-organisms, including bacteria, viruses and spores, is that it penetrates the organism’s cell wall and damages the DNA, preventing cell division reproduction; certain doom, given their short lifespan. Another useful UV wavelength is 187nm, which is sometimes known as UVV and is used for UV photo oxidation of airborne chemicals and odours. UVV produces ozone, oxygen singlets and hydroxyls (O3, O and OH), which although excellent for treating airborne odours and other chemicals, can leave harmful concentrations of residual ozone being supplied to occupied spaces. For this reason UVV is only used if followed downstream by and interlocked with, a UVGI system which acts as a catalyst reverting residual O3 safely back to O2. Within ducted systems, UV comes in two main guises.
Two UV air purifiers used in series, UVV and UVC combined for both biological and chemical challenges
For treatment of odours and chemicals UVV and UVGI lamps must be used in combination.
Coil Cleaning Firstly UV lamps arranged to bathe the cooling coils and drain pan of an air handling unit in UVC light is used to prevent the build up of mould and slime. Left unchecked the cool, wet surfaces present an ideal breeding ground for biomass, blocking fins and reducing thermal efficiency, and creating a source of biological contamination easily picked up and vented to rooms. UV coil cleaners prevent this biomass with the economic benefit that the initial efficiency of the coils is maintained and the costs and down-time associated maintenance and coil cleaning are eliminated.”
UV Air Purifiers was last modified: January 15th, 2020 by Bill Anderson
Your essential guide to drying rooms and buildings after a flood disaster.
Extreme weather events are increasingly leading to costly flood damage to domestic and commercial properties
The rain lashes down, drains block with fallen leaves and silt. The flood waters rise and search for new destinations. Houses, businesses, shops, offices, schools – the flood water does not discriminate between building types, only what ‘level’ they are at. Although these days flooding can arise at any time of year it is still a particular problem in autumn. Buildings affected can be anything from a bit damp to massively damaged by flood water. Here we provide our top tips for drying out buildings and rooms affected by flooding. These top tips are as useful for drying up after a burst pipe, or bath overflow as they are for a rainwater flood, and should help you get dry in quick time.
1. If insured, discuss your claim and drying requirements with your insurer. They may hire a contractor to do the drying for you, in which case you can concentrate your attention on saving your contents and making sure that those you are responsible for are accommodated somewhere else. If it is a small drying job, perhaps one that is uninsured, or one that is not worth claiming for then the next 9 top tips are good to go, so long as you can establish that it is safe to do so by first consulting an electrician and perhaps a plumber.
2. Whats wet? No, it’s not a stupid question but the answer will affect how you dry the building and what equipment you use.
Say you have a traditional British type constructed building and the masonry walls and the suspended floor, complete with carpets is wet, then what you are looking at is potentially using a puddle pump (to pump out any remaining flood water from under your floor), a carpet dryer fan to blow air under the carpet, dehumidifier and a radiant heater.
Puddle pump – Good for pumping out flood water from under suspended floors
Big building dryer, otherwise known as an industrial mobile dehumidifier
Mobile radiant heater ideal for warming walls
carpet dryer designed for blowing air under a carpet so that the air gets a chance to dry the floor underneath and underside of the carpet
Alternatively – If you have a modern solid floor with tiles, timber or laminate flooring, then the chances are that it has been laid with an insulation layer which is saturated and needs to be dried before it can again be an effective insulating layer. For this you will need a restorative drying unit (to suck water out from the insulation layer under the floor), a dehumidifier and a radiant heater.
Restorative dryer, designed to dry out insulation layers under floors and in other difficult places.
Big building dryer, otherwise known as an industrial mobile dehumidifier
Mobile radiant heater ideal for warming walls
3. Use as big a dehumidifier as you can afford. Basically a little domestic plastic cased machine will not be up to it. You will need a big mobile dehumidifier – consider 30 ltr/day extraction rate as the bare minimum for drying a flood damaged small room. Bigger is better and quicker. More than one room to dry ? Then consider using extra dehumidifiers.
With only about 11 or 12 ltr/day removal rate @ 20 °C, it will take a long time, but is better than nothing
A bit bigger and a bit better
Bigger yet, even better and quicker
4. When using a dehumidifier make sure to minimise air ingress into the building. Close all doors and windows and trickle vents (if you have them). The idea here is that by keeping the building air sealed, that the air in the building can be made as dry as possible with the dehumidifier, without giving it the extra burden of drying extra air from outside.
5. Ensure the dehumidifier is positioned so that it can treat the air without any obstructions. Placement in the middle of the room is best. If you have a large room and a number of dehumidifiers working simultaneously, spread them evenly in the room and away from walls.
6. Use portable radiant heaters for heating up surfaces, such as plaster work. Warm walls will evaporate water far quicker than cold walls. Either use conventional portable radiant heaters or use radiant masonry drying panels. Don’t put them too close to the wall otherwise you will get a hot spot, but place them a distance away so that a greater area is gently warmed.
Set back from a wall it will provide heat to a large area of wall to speed drying
Masonry dryers are ideal for drying plaster and for drying out walls after flooding
7. Add extra heat. Radiant heaters when used will also (in time) warm up air in the building, but if it is still cold in the room or building put in electric space heaters to raise the air temperature. Don’t use direct fired oil or gas heaters for this purpose as they will deplete the oxygen in the building. If you need more heating power, beyond what the mains supply to the building can safely provide via electric heaters, then use indirect fired oil or gas heating, with the heater located outside and warm air ducted in, ideally on a recirculation system so that heat is not wasted to the outside. Ideally the building air temperature needs to be raised to at least 20°C. The warmer the air is the more moisture it can hold, the more water will evaporate from surfaces, and the more efficiently the dehumidifier(s) will work.
ArcothermEC32 indirect oil-fired heater can deliver about 29kw of heat to a building. This model can not be fitted with a recirculation duct
Kroll HM200 indirect gas-fired heating plant for large heating and drying jobs. This model is fitted with a recirculation duct
FireFloFF3 portable fan heater, ideal for putting extra heat into a room that is being dried
8. Work out what happens with the condensate collected by the dehumidifier. If it collects in a tank, remember to frequently empty the tank. If you do not do this the dehumidifier will stop to prevent it spilling the condensate on to the floor. If it has a continuous drainage arrangement make sure that it can flow by gravity to a suitable drain. If the dehumidifier has a condensate drain that is great, because it means that you can get the condensate to a drain more or less anywhere within reach of the hose that you attach to the dehumidifier and means you can leave the machine to work for long periods. If necessary slightly elevate the dehumidifier on blocks of some sort so that the gravity drain will operate successfully.
9. Consider putting air circulator fans into the building. If there is not enough air movement from the various machines in the building, the dehumidifiers, heaters, carpet dryers etc., you may discover that some areas are holding air pockets which are being left by the general air circulation. In this situation use fans to move the air in these areas.
10. Use a moisture meter to track drying progress. With active drying there is a danger that walls and floors appear to be dry when they are still damp under the surface. 2 pin or 4 pin moisture meters can be purchased for as little as £10 and they tell you what is happening in the wall rather than what is happening on the surface. If you don’t get this right, you might think your building is dry and as soon as you remove the dehumidifiers and drop the heat to normal levels, damp will reappear. Also use feel to determine how the building is drying. Drying of walls will start at the top of the wall and dry towards the base. As you run your hand over what appears to be a dry wall, top to bottom you will probably notice the temperature of the wall cool, part way down. This will be roughly where the wall has dried down to.
These Top 10 Building Drying Tips are designed to give a brief overview of the challenge drying a building or perhaps a room. The Guidance and standards for drying flood damaged buildings provides a really comprehensive guide to the subject and has much more information.
For more information or want to hear from one of our specialists, visit our websitefor further details.
Flood Damage – Top 10 building drying tips was last modified: January 24th, 2020 by Bill Anderson
For industrial zone heating it is difficult to better the quick heat up times and economy of gas plaque heaters
Gas Plaque Heaters: Application
Gas plaque heaters are perhaps the most effective and economical method of providing quick warming zoned radiant heating to large buildings. Gas as a heating fuel, particularly mains natural gas has long been seen as a cost-effective fuel, and when used in a radiant zone heating format provides for true efficiency.
Zone heating is ideally suited for large industrial building because typically one air space will have several areas with differing (if any) heating requirements. For example there will typically be areas put over to raw materials and finished product storage which don’t necessarily need heating, areas where there are sitting staff needing heat to one temperature and areas where there are other staff moving about doing more strenuous work which need heating but to a lesser extent.
With radiant heating you can discriminate between these areas, even leaving some areas within the same air space, unheated. Moreover the area heated can be narrowed by the choice of gas plaque heaters and the height at which the radiant gas plaque heaters are mounted. Generally the higher the plaque heater is mounted the greater the area heated beneath, and the greater the heating power required from that heater. Contrast the selective nature of zone heating with radiant heaters with the all or nothing method of space heating the air in the complete building. No wonder gas plaque heaters are so popular in our industrial buildings.
Puravent’s Range of Gas Plaque Heaters
At Puravent we supply the Infraglo Flamrad range of heaters, which have 6 sizes ranging in output from 3 kw to 27kw. Not that they all run on natural gas – for each size there is a variant which will burn propane for the applications where natural gas is not an option.
These automatic gas plaque heaters have spark ignition and flame monitoring. In the event of flame failure, lockout of the appliance will ensure complete safety; the unit can be reset by interrupting the mains supply. The heaters lend themselves to control by time clock, thermostats or energy management systems.
Infraglo Flamrad gas plaque heaters features
As well as the single burner models in the Flamrad range there are also double head gas plaque heaters. These heaters typically find their application in areas of the building away from the side walls, and are hung to cast radiant heat on the staff work areas that are out of reach of wall mounted heaters.
Like any direct fired heating system used inside a building, it is essential that the minimum ventilation requirements are met in the building. When these units are installed by a Gas Safe registered fitter, they will ensure that there is sufficient fixed ventilation for heater and that the minimum fixed ‘free area’ of ventilation grills is at least met and preferably exceeded.
Gas Plaque Heaters was last modified: January 15th, 2020 by Bill Anderson
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.
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.
Mark GSX, ideal for heating industrial workplaces using gas
Often known as gas unit heaters, these indirect heaters are almost the standard installed heating solution in industrial buildings. They produce clean dry heat and combustion gases are expelled via a flue to outside. They are efficient for a number of reasons but one is that they are designed to use a balanced flue. This means that the combustion air is drawn from outside rather than warm indoor air. It means keeping the warm air inside and the outside air to the outside. Conversely if air was drawn from inside the building then the it would result in an outflow of air via the flue from building which would result in a lower pressure in the building meaning that outside air would use any pathway into the building (cracks, window seals, door seals etc) and drafts. Using indirect gas heaters for heating industrial workplaces is reasonably cost-effective, but the cost of equipment and installation is a bit higher than electrical heating
Fixed Gas Radiant Heating
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
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.
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.
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.
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.
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
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 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, 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 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. The suitability of stream radiant panels for ATEX zoned areas will depend on the temperature class requirements of the zone, and the surface temperature of the panel and indeed the steam pipe will depend on the steam pressure. It means that the heater itself is dumb but the amount of heat it produces and indeed the temperature of the heater is down to the clever control of pressure in the piped steam. Any control system for the heaters whether it be based in zone or out of it, must have fail safe features to ensure that a maximum pressure in the steam pipe is not breached, so that the pipework and heaters do not stray beyond the required temperature class.
This is just a very short overview of just some of the general methods of heating industrial workspaces. There are a number of other methods and a vast range of products available from Puravent. If you need any help whatsoever to find your industrial heating system, let us know.
Heating Industrial Workplaces was last modified: January 15th, 2020 by Bill Anderson
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
Wall-mounted Unit heater with hot water feed
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
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
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
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
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
Marquee packages can be Diesel, Oil, or Gas powered.
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.
Indirect 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
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.
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.
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
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
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 firstname.lastname@example.org or call us on +44 (0)1729 824108
Discussion of Unit Heater Types was last modified: February 25th, 2019 by Bill Anderson
High Volume Low Speed destratification fans (better known as HVLS destratification fans) are able to provide great improvements in working environments, customer environments and livestock housings, 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, conferance centres, warehouses, manufacturing environments and livestock buildings.
What is ‘stratification’ of air?
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.
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.
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).
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.
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 email@example.com or call us on +44 (0)1729 824108
HVLS Destratification Fans – A Guide was last modified: October 22nd, 2019 by Bill Anderson
The oil-fired Confort cabinet heaters range has been revised.
Confort cabinet heaters – Old 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:
Rated heat power [kw]
Output heat power [kw]
Heat efficiency [ % ]
Air flow [ m3/h]
Available static pressure [ mm H2O]
Fuel consumption [kg/h]
Tank capacity [ l ]
Power consumption 230V [ W ]
A further comparison shows a few extra features …
The old 1G/2G models
The new 35/70/100 models
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
The new style of control pad on the Confort cabinet heaters range
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 firstname.lastname@example.org
Confort Cabinet Heaters Evolve was last modified: November 7th, 2018 by Bill Anderson