Industrial Heaters

Industrial heaters are frequently used in almost all the industries today right from warehousing, manufacturing , to food processing. There is a variety of industrial heaters that serve different purposes. Being an unavoidable necessity, it is very important for business owners to install a warming solution in their factory premises to serve their purpose.

Installing them may be an easy task as you simply order the supplier or dealer to do so, yet the most challenging part lies in different types of questions and queries before installing-

Please go through the following points if you want to get the most out of your heating devices-

First of all, make an in-depth assessment of what your heating needs exactly are. Looking at the devices randomly may take you on the wrong route

The following are the most common types of heaters on the market based on fuel types

Industrial Heaters – Gas Heaters and Propane(LPG) Heaters

Gas heaters and propane heaters burn natural gas, propane, liquefied natural gas (LNG) or other gaseous fuels to generate heat. The first gas heaters were similar to the Bunsen burner in that both they used a flame to heat air locally. This heated air was spread by convection to warm an entire area. Later, the burner’s flame was used to heat a structure made of asbestos, a strong and incombustible fibre. Although asbestos structures have been replaced by fire clay and other refractory materials, modern gas heaters still operate according to this principle. Gas heaters and propane heaters often use similar designs.


Industrial Heaters

Performance Specifications

Specifications for natural gas heaters and propane (LPG) heaters include maximum temperature, heating capacity and maximum air flow. There are two parameters for maximum temperature, maximum air temperature and maximum operating temperature.

The maximum operating temperature for gas heaters is the highest temperature that the heater’s coating or protective cover may reach.

The maximum air temperature, as its words suggest, is the maximum temperature of the air exiting from the heater.

Heating capacity is the wattage that gas heaters and propane (LPG) heaters can deliver.


Gas heaters and propane heaters differ in terms of insulation. Choices for insulation include ceramic, magnesium oxide, fluoropolymer, mica, mineral and fiberglass.

Industrial Heaters – Applications

The variety of different applications for gas and propane heaters include annealing and heat treating, drying, curing and tempering, melting, and the heating of gases and vapours. Gas heaters and propane heaters are also used to heat clean water, high purity waters and process waters, lightweight oils and degreasing solutions; heavy and medium weight oils, caustic solutions and mild and severe corrosive solutions.

Industrial Heaters – Features

There are many optional features for gas heaters. Some products are indirect-fired, corrosion resistant, finned, and explosion-proof or can be controlled by a microprocessor. Others are designed to provide dynamic power regulation and for cryogenic applications. They can feature custom designs or have an encased coil for maximum heat transfer. Gas heaters can also be fitted with an internal temperature detector, a grounding wire, and multiple / independent timing controls. Other additional features may also include overheat protection, thermostat control; portability and approval by the relevant authority i.e  British standard or European Standard .certification is available from the manufacturer.

For more information of our range of gas heaters, please click here

Industrial Heaters – Oil Heaters and Kerosene Heaters

Oil and kerosene heaters burn liquid petroleum products to generate heat. They consist of metal columns with cavities and a heating element. Inside these cavities, oil or kerosene flows freely around a heating element. This element, which is located at the bottom of the heater, transfers heat through the fluid in a process called convection. The oil or kerosene acts as a heat buffer or reservoir and provides both a relatively high specific-heat capacity and a high boiling point. Because of its high specific-heat capacity, the oil or kerosene accumulates a large amount of thermal energy in a small volume. This high boiling point allows the fuel source to remain in the liquid phase, and means that oil heaters and kerosene heaters do not have to be high-pressure vessels.

Industrial Heaters -Types

There are many different types of oil and kerosene heaters. The variety include air, band, coil, and cable heaters; drum, duct, and enclosure heaters; and flexible, forced-air, immersion, and induction heaters. Cartridge, cast-in, ceramic fibre, and circulation heaters; Heat torches are forced-process air heaters that may burn oil or kerosene. Oil and kerosene heaters also include over-the-side, radiant flat panel, infrared (IR) and radiant reflective process heaters. Radiant heater elements are used with both radiant reflective and radiant flat panel heaters. Other types of oil and kerosene heaters include room or space heaters, steam injection heaters, along with strip, tubular, and water heaters.

Industrial Heaters


Oil and kerosene heaters transfer heat to a room at a slower rate and over a longer period of time. Using the liquid petroleum as a heat reservoir, they transfer heat via conduction and radiation. Typically, the columns of oil and kerosene heaters are made of metal and constructed as thin fins. In this way, the surface area is large in relation to the volume of the heat reservoir.


Specifications for the heating element include length or height, depth or thickness and width or diameter, some oil and kerosene heaters use single-phase or three-phase power. Others require AC voltage. Typically, industrial heaters use AC voltage instead of DC voltage.


There are a variety of different applications for oil and kerosene heaters. Examples include;

  • Drying,
  • Melting,
  • Annealing or heat treating,
  • Curing or tempering
  • Operations with gases and vapours,
  • Clean water heating

Oil and kerosene heaters are also used to heat process and high-purity waters, lightweight oils & degreasing solutions, heavy &  medium weight oils, mild & severe corrosive solutions, caustic solutions, and liquid paraffin. Depending on the application, insulation options are also important to consider when selecting an oil or kerosene heater.


For more information of our range of oil heaters, please click here

Industrial Heaters – Electric Heaters

Common electric heating coil Electrics heaters generate heat by passing an electric current through a high-resistance material. These heating devices have been adapted for commercial, industrial and consumer applications.

Electric heaters radiate heat with the use of a flat panel emitter, radiant reflective element, tubular element, flexible heater element or other type of heating element. A heating element is usually made up of a coil, ribbon (corrugated or straight), or strip of wire that gives off heat similar to a lamp filament. When an electric current passes through it, it glows red hot and converts electrical energy into heat.


Heating elements are mostly either iron-based or nickel-based.  Nickel-based heating elements are typically made of nichrome, an alloy that consists of about 80% nickel and 20% chromium. Nichrome is a popular and common material for heating elements because of its high melting point of 2,550°F (1,400°C)

It also will not oxidize at high temperatures and does not expand much when it heats up. It also retains a consistent resistance of about 10% between ambient temperature and maximum operating temperature.


Industrial Heaters


Some key features of electric heaters are portability, precision temperature monitoring & control and design flexibility

Industrial Heaters – Applications

Electric heaters are commonly used throughout industrial and consumer products to heat all types of liquids, gases, vapours, and solids. In consumer products, electric heaters are commonly used for heating water, air and even flooring. Industrial applications can utilize much higher wattages and industrial electrical heaters can be used for applications such as heat treating, annealing, melting, and the heating of all types of process fluids.

For more information of our range of electric heaters, please click here

Industrial Heaters – How to calculate how much heat you require

Once you have determined the type of heater for you building you then need to work out which size you require. This can be achieved in the form of a simple heat loss calculation. The most important factors to consider are the dimensions of the building, the length, width and average height. There are a number of online calculators that you can use to work out the heat requirements. Below you can download our heat loss calculation sheet which shows you how simple it is

Download Heat Calculator

Workshop Heater

Military Grade Warm Air Mobile Heaters

Military Grade Warm Air Mobile Heaters – Here at Flexiheat UK, not only do we don the standard mobile warm air heaters , for construction sites , the rental industry , marquee heating etc , but we also do more demanding requirements , that you often find that the armed forces require. These tend to be that the units have to be able to dropped from height, thus ensuring that they can resist so many “G” force , can run on jet fuel , as well as the standard gas oil  / kerosene or natural gas / LPG Gas . Whatever the requirements , we can supply warm air mobile heaters to for-fill these tasks . We keep our client list confidential as you can appreciate , but if you require any military grade mobile warm air heaters , then we are the people to deal with.

Military grade mobile warm air heater


The picture above , shows one of the mobile warm air units that we have produced for an armed forces nation , and shows one the bespoke things that we can do , for example the colour , which you can specify etc.

To be honest , our standard warm air indirect mobile heaters , the “M “range, have many of the features of the military grade units which are designated as our “MM” range, in that they can be used down to temperatures as low as minus 20° C etc , and our “MM” range of Military grade warm air mobile heaters are just adaptations of these units  , with bespoke requirements suited to each individual customer.

Below you can see one of our military grade warm air mobile heaters, coupled up with two warm air flexible air hoses on the outlet side , and two re-circulation air inlet hoses on the inlet side. This configuration will ensure that the area being heated , will not only heat up faster , but will mean that fuel requirements can be 25 – 30% lower compared to units working with fresh air taken from the environment

Military grade mobile warm air heaters



For more information on our range of warm air heating solutions, please click on our main products page here .  Alternatively, please give us a call on 01202 822222 and our dedicated sales team will be happy to offer advice and assistance or contact us by mail by clicking here

Commercial Dehumidifier

Take Advantage of Our Garage Heater Knowledge

Garages aren’t known for being warm, comfortable spaces to work, but that doesn’t mean they can’t be. With the help of a garage heater, your commercial or industrial environment can become a warm, dry place to work.

Garages can often feel quite cold and damp, especially during cold weather but it needn’t be that way. As they are quite confined spaces, often lined wall to wall with spare parts and tools.

However, it is essential that your garage interior is kept warm and dry to protect all those parts, tools and vehicles that you may have stored in there, let alone your staff . That’s where investing in a heater that’s specific to the environment can come in handy. Providing reliable warmth and helping to keep the air within your garage dry and moisture free, our range of heating systems is perfect for all types of garages or workshops.

No matter whether you own a small one-vehicle garage or a larger, warehouse-like commercial car garage, we have a selection of gas and oil heaters for you to choose from which suit a variety of needs and requirements.

We know that many businesses and individual customers are working to a tight budget, which is why we aim to provide a selection of products that covers a wide range of budgets. No matter how big or small your budget is, we are sure that we will have a product to suit both your budget and your needs.

There are four main types of garage heaters available: electric, natural gas or propane gas and oil. Electric heaters are easy to install, efficient, and require little maintenance. You simply plug them in when needed, adjust the thermostat to the desired temperature, and unplug when you’re done, but the larger outputs output units require 3 phases /400Volt supply.

Gas heaters and oil heaters are often the most inexpensive option, but they require access to a natural gas supply. Propane heaters need a propane tank, and oil require an oil tank



                                                           Suspended  Warm Air Heater  – Gas or Oil Fired                                                                                                     

Garage Heater



                                                        Stationary Warm Air Heater – Oil or Gas Fired


Garage Heater



                                                      Industrial Electric Heaters                                                                                                                                                

Garage Heater


                                                  Larger Industrial Electric Heaters  


Garage Heater



Or you can utilise one of our waste oil heaters, either manual fired, or fully automatic operation, and use your waste oil!

Garage Heater

W401K Manual Fired Stationary Heaters


Benefits of Installing a Garage Heater

When you choose the right type of heater for your garage, it’s relatively inexpensive to run and much cheaper than insulating the whole space.

For garages that house workshops, a heater is essential. It’s hard to get anything done if you have to bundle up in winter gear just to stay warm. Instead of shivering your way through every project, you can turn on the garage heater and work in comfort.

Finding the most suitable heating solution for a garage or outhouse may seem like a difficult task, but with the help of the experts that we have working with us here at Flexiheat UK, it’s much easier than you think! You’ll be feeling the benefits of your brand new gas or oil heater in no time!

Small Waste Oil Burners – Regulations

We have received notification from the Department for Environment Food and Rural Affairs (DEFRA) that they intend to consult on whether the revised guidance in respect of Small Waste Oil Burners (SWOB) is clear.

Existing guidance allowed local authorities to consider them on a case by case basis and in most cases exempt them from the regulations and issue a simple permit costing less than £100 per year. This was generally referred to as being “exempt from the WID” (EU Waste Oil Directive).

The new guidance explicitly states that Small Waste Oil burners ARE within the scope of the Environmental Permitting (England & Wales) Regulations 2010. This clarification means that in order to continue to burn waste oil in a SWOB after 31st March 2016 it will be necessary to have a permit under Schedule 13A of the Environmental Permitting (England & Wales) Regulations 2010.

Although these will still be issued by local authorities, the fees will be set by DEFRA with an initial application fee of £3218 and an annual fee of £1,384. There is also likely to be additional monitoring requirements which will further increase costs.

This is likely to be cost prohibitive for most garages and the only alternative will be to burn non-waste fuel. It is important to note that the consultation does not ask whether SWOBs should continue to be exempt, only whether the revised guidance is clear.

NOTE: This change to the guidance affects England and Wales only, current guidance in Scotland and Northern Ireland already states that SWOBs are within the legislation.

If you currently have a permit issued by your local authority, it is likely that you will receive a letter from them shortly advising you of the changes.

Waste oil heaters, which really should be called multi oil heaters as they can operate on various alternative oils which do not require a licence from Defra. These units can be operated on 35 second heating oil, diesel, processed fuel oil (PFO) and bio oils such as rapeseed, linseed and other certain refined vegetable oils.

Our W401K small waste oil heater, which is manual ignition, does not require any adjustment to burning the above oils.

Our automatic SZ range of waste oil heaters requires a simple adjustment to the compressed air pressure and the temperature settings of the pre-heat oil thermostat.

For more information please don’t hesitate to contact us via email or on 01202 822221

Industrial Dehumidifier – The Flexiheat Way

Here at Flexiheat UK, we have an extensive range of Industrial Dehumidifier or Dehumidifiers as we should correctly state. We have a full range that goes from 30 litres per day all the way up to 120 litres per day. The smallest of our range is our T24 model, the baby of the range, which is really a light commercial dehumidifier, but will still extract up to 30 litres per day. It is perfectly suited to household dehumidification, or small offices, storage rooms etc. Some of its features include –

  • Integrated hygrostat
  • Two speed fan
  • Timer (power off) function
  • Temperature & Humidity display Tank ‘FULL’ indicator & auto shut off
  • 6 litre Water tank
  • Permanent drain option (with 1m hose supplied)
  • Removable filter
  • Castors for easy mobility (removable)
  • Compact & light weight design

Small Domestic 30L 24hr Dehumidifier

Next we have our TK Range Industrial Dehumidifier, which has two units within the range –

The TK30 Unit – 30ltrs/24hrs and the TK60 Unit – 60ltrs/24hrs (at 30°C/90% relative air humidity)

These are only available as a 240 Volt Dehumidifier (we do dual voltage dehumidifiers -please see below) and  come as standard with hours counters and an integrated hygrostat, as well as hot gas defrost which ensures higher efficiency, with less down time. Of particular interest to the rental market, is that the TK dehumidifier is stackable, saving you valuable storage space and making them easier to transport. The Kroll TK range of dehumidifiers are designed to cope with demanding site conditions, spending their time on hire.

TK main features are ;-

  • Integrated hygrostat
  • Steel casing, powder-coated
  • Hours counter
  • Drip pan
  • Hot gas defrosting
  • Stackable
  • Drip pan
  • Modularly extendible

TK Range Industrial Dehumidifier

Then we have our “TEIndustrial Dehumidifier range, one of the biggest problems with refrigerant dehumidifiers is that when the temperature in the area being dried drops, then the performance of the dehumidifier drops quite severely. Kroll being a German manufacturer and renowned for its technical expertise has come up with a solution to boost extraction rates at lower temperatures that we tend to see in the UK and Northern Europe. That engineering solution is to add a 2 kW electric heating element prior to the evaporator, which increases the air temperature, allowing it to hold more water vapour which is then removed by the evaporator. This makes the TE range of dehumidifiers extremely efficient, often removing the need to add additional heating to the area being dried, and cutting down on the time required to do the job of drying the area. The drying capacity of this range is from – 30ltrs/24hrs To -120ltrs/24hrs (at 30°C/90% relative air humidity)

TE main features are –

  • Steel casing, powder-coater
  • Hours counter
  • Hot gas defrosting
  • Drip pan
  • Hygrostat connection

TE Dehumidifiers

And last of our Industrial Dehumidifier range is our Dual Voltage Dehumidifier, which is available in two models, The T20D is a 20/ltrs a day unit and the T40D is a 40/ltrs a day again  at 30°C/90% relative air humidity. With their unrivalled versatility these Kroll dual voltage dehumidifiers are a popular choice throughout the hire and flood restoration industries where they help reduce the speed of drying times and reduce water damage. The come as standard with hours counters

Dual Voltage Dehumidifier

So as you can see Flexiheat UK has a full range to cover all your dehumidification needs.  For more information on industrial dehumidifier systems, please click on our products page here. Alternatively, please give us a call on 01202 822222 and our dedicated sales team will be happy to offer advice and assistance or just contact us by mail by clicking here.


Pest Control Heat Treatment Systems

Kill Bed Bugs & Termites Without Pesticides

The call from consumers today has changed in recent years. Today’s pest customers have been educated by the ongoing news of bedbugs in the media and the benefits of using pest control heat treatment systems or ‘Thermal Treatment  as the most efficient method to the eradication of  infestations

They specifically request to have heat instead of chemical insecticide treatments.

Heat does not have many limitations with respect to the number of items treated and the area to be treated. There are no chemical residues to consider and, compared to gas fumigation of areas, margins for safety are considerably greater.

With Flexiheat UK’s E18SH high temperature electric heater or our M range warm Air heater you don’t just enjoy the best return on investment in the industry, you get the original developers and a team that truly cares and is passionate about this technology as an alternate to insecticides to eradicate indoor insects.

Pesticide-based indoor bed bug control methods raise concern over the safety of occupants. Our affordable heat treatment systems offer you the ability to perform bed bug control work without relying on toxic chemical residues.

Heat is a proven technology. Our state-of–the-art tested technology developed and perfected by Kroll Energy means our equipment is designed to be a complete Pest Control Heat Treatment System without sacrificing quality or capability.

Basic Guidelines To Bed Bug Heat Treatments


Pest Control Heat Treatment Systems


Every Living Organism Has A Thermal Death Point
Bed bugs exposed to 45°C will die if they receive constant exposure to that temperature for 90 minutes or more. However, they will die within 20 minutes if exposed to 48°C. Interestingly, bed bug eggs must be exposed to 48°C for 90 minutes to reach 100% mortality.
The same process for treating bed bugs will also kill, and in some cases, completely eradicate other organisms.

Regardless of the heat source, temperatures and run times must be achieved throughout the structure to achieve the eradication of the pest !

Let’s Compare the two pest control heat treatment systems

Electric Vs Propane,
What heat system you employ affects heat treatment run times and methodology

Pest Control Heat Treatment Systems

  • Electric heat is a closed system. It operates from within the structure being treated with heat. Electric heat is slower in the beginning of the heating process than propane.
    With Flexiheat’s electric E18SH heater, starting room temperatures raise by approximately 5˚C for every hour. However, the ambient room air temperature will increase at a faster and faster rate as the room temperature rises and recycles itself. It is the multiplying effect of air turnover with a closed system.
    Electric heat requires power sources. Adding more electric heaters, will be more productive to your heat treatments. However, the power source becomes a growing challenge.Check your available amperes.

Pest Control Heat Treatment Systems



  • Propane heat is an open system. The unit stays outside the structure and the heat is ducted into the building. It produces positive air pressure. The units require a source of propane to operate. for more information on our range of indirect fired mobile heater – click here
    Intense and immediate heating of the space. Higher air output, higher volume of heated air, high productivity capabilities as compared to electric systems. Propane can be divided with splitting the heat ducting to cover more area, rooms or even another unit.
    Propane results in more thorough penetration and distribution of the heated air.

Factors to consider –

  • Square feet: large or small space. The larger the area the longer heating time for all areas to reach lethal temperatures.
  • Building materials: cement, steel, dry wall, etc. will affect the heating times. Cement floors and walls will take as much as 3 times the time due to the fact that cement acts as an insulator and can maintain cool temperatures with slowly changing thus requiring more heat time.
  • Furnishings: lots of furniture will require more run time due to the amount of objects surface area needing to get to temperature and the obstacle of more furnishing for the heated air to travel through and around.
  • Clutter: Piles of clothing and blankets are very important to move around and mix. The room air temperatures can be 55˚C and under the pile of clothing it could be 27˚C which is not lethal. No clutter, is recommended.
  • Weather: heating in a desert or in high altitude with snow. Is it warm or hot when starting? Humidity and cold will take adjustments and more heat time.
  • Degree of infestation: Identifying infestations early is key to control and is much easier to get a 100% kill. If the infestation is large and mature, basically way over due for treatment, you will need to take time to move objects, furniture, open all draws and closets and spend extra time preparing and allowing more time for longer heat penetration of the structure and furnishings.
  • Starting temperature: Similar to weather but room temperature. Is the treatment beginning temperature at, for example: 25˚C or 5˚C?

All efforts should be taken to preheat a structure prior or during set-up of heat treatment equipment. Starting with a pre-heated room achieves faster arrival times for lethal temperature resulting in less treatment time, and higher productivity.


For more information on pest control heat treatment systems,  please click on our products page here .  Alternatively, please give us a call on 01202 822222 and our dedicated sales team will be happy to offer advice and assistance or just contact us by mail by clicking here

Warm Air Heating – Introduction & Benefits

Why is warm air heating consistently popular for large spaces?

Of the various options that are available for heating spaces such as factories, warehouses and retail ‘sheds’, warm air heating has been the most popular for decades. So why is this?

The reason is that not only does warm air heating offer a number of significant benefits for the majority of these buildings, it has also proven those benefits time and again, in many different applications. Consequently, it’s worth considering just what those benefits are.

 Energy efficient

Standard indirect-fired non-condensing warm air heaters are able to deliver minimum net efficiencies of 91% and the latest condensing models provide even higher efficiencies with a minimum 101% (net) at both full and part load, in compliance with the latest EU regulations.

A further significant benefit is that the heat input can be closely tailored to meet the building’s heating requirements. Configured with optional high/low or modulating heat outputs, the heater(s) automatically reduce output once the building environment conditions have been attained, offering a comfortable environment without significant swings in temperature.

With warm air heating, system output can usually be matched to the building load requirements. The same is not always true of alternatives such as radiant where heat input is sometimes compromised to provide adequate coverage of the heated zone. This is typical for modern well insulated buildings.

Depending on the application, warm air heating systems may be combined with destratification fans for even greater efficiency. The Carbon Trust estimates that the use of destratification fans in industrial buildings with high ceilings that are operating a warm air heating system can reduce energy consumption by 20%.

Even distribution

Warm air space heating systems use a fan to draw air in from the space being heated, pass it across a heat exchanger, and distribute the warmed air evenly throughout the space. This even distribution by warm air heating systems is in contrast to heating technologies such as radiant heating that only warms objects that are in ‘direct line of sight’. This means they are vulnerable to ‘shading’ issues that leads to uneven heat distribution.

Versatile positioning

Warm air heaters offer considerable flexibility in terms of their location, ensuring the layout of the heating system is optimised for the configuration of the space being heated. They can be suspended above the space, mounted on walls or they can stand on the floor. Models are available with discharge heads or louvres for direct warming of the air; alternatively heaters can be specified for connection to ductwork for distribution across a wider area.

Warm Air Heating

Air movement

A feature of warm air heaters is that they also offer flexibility in terms of air movement. Most systems re-circulate warm air within the building; however they can also be used to provide air movement in the summer by operating ‘fan only’. In addition heaters can be equipped with fresh air intakes – particularly useful for dusty environments or where fresh air is considered beneficial.

If a building has a process with extract ventilation then it is often a good idea to bring the replacement air in via a fresh air input to the heater. In that way, the input air is warmed and tempered preventing cold uncomfortable draughts.

 Flexible heat sources

Warm air heating offers a choice of heat sources to best suit the application and current energy costs. Warm air heaters are typically operated on natural gas and LPG  – see our SG product range,   light fuel oil see our SO product range or even waste oil see our SZ product range

Warm Air Heating


Warm air heaters are also highly controllable, enabling their operation to be closely aligned to the requirements within the space – thus avoiding wasted energy. For example, if there are some areas of the space that are only used occasionally it may be beneficial to zone the heating system so that these spaces are not heated to the same temperature as areas where people are working all day.

There will also be benefits to optimum start and stop control to minimise energy consumption.


For more information on our range of warm air heating solutions, please click on our main products page here .  Alternatively, please give us a call on 01202 822222 and our dedicated sales team will be happy to offer advice and assistance or just contact us by mail by clicking here