Commercial Boiler

Commercial Boiler

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A commercial boiler is a pressurized system that burn combustible fuel, either gas (natural or LPG) or oil to heat water that is then used to provide heat to your building. Commercial boilers work just like domestic boilers just that they are larger in output, some people say over 70 kW is a commercial boiler, whilst others say that anything over 50kW output is- there is no hard and fast rule to be honest. Some boilers use the actual hot water itself while others utilise water that has been turned to steam. Be it an hotel, school or hospital boiler, a district heating scheme or any industrial or commercial refurbishment of your heating scheme or project requirements, you can benefit from our vast experience in supplying commercial heating boilers in the UK and Ireland.

Inside the commercial boiler itself, the burner, whether it be natural gas / Propane (LPG) or Oil creates heat that is then transferred to the water via the heat exchanger. The process normally creates either hot water, depending on the type of commercial boiler. The hot water is circulated via pipes throughout your building. The water then enters radiators or other components that divide the heat thus providing the heating you require to keep your indoor spaces comfortable, just like a domestic boiler.

Our commercial boilers have energy efficiency, as you would expect from leading manufacturers and are normally used on pressurised systems

Natural gas is probably the most common fuel used in commercial boilers. Other types of boilers are available that burn fuel oil like diesel or heating oil. There are also boilers out there that use electric immersion heaters to produce heating from electricity-We also supply these

We do a full range of commercial boilers that can do heating and hot water for your commercial premises – these are detailed in more depth on these webpages

Commercial boilers – Gas fired – Natural gas or LPG 

Commercial boilers – Combi -heating and hot water in one unit – Gas Fired – Natural gas or LPG

Commercial boilers – Oil fired

Commercial boilers – Electric powered 

We at Flexiheat have the widest range in the UK, of efficient boilers for commercial heating and hot water applications, that provide maximum energy efficiency and low emissions for your installation.

Common components of commercial boilers


  • Burner: A burner is a device for the combustion of a fuel. For example, a fuel oil burner can be mounted on the boiler of a central heating system (oil heating). The burner produces a flame by pressing the fuel oil through a fine nozzle and supplying combustion air with a blower. In the burner start, the flame is usually ignited with an electric arc. The hot combustion gases enter the boiler, which effectively serves as a heat exchanger: the generated heat is transferred to the boiler water to a large extent. Similar burners are operated with natural gas. No atomization is necessary here, only a good mixing of gas and air. The correct dosage of the combustion air is important for a clean and efficient combustion. Ideally, the burner supplies exactly the required amount of air to the flame: by no means too little to allow complete combustion (without the formation of soot or carbon monoxide), but not too much to minimise exhaust gas losses


  • Combustion chamber: A combustion chamber is a component in which air and fuel are mixed, ignited and burned to heat the water. The chamber contains the burners and is specially designed to provide a safe and secure area for high-temperature combustion of volatile fuel. The chamber is commonly constructed of steel, cast iron or other heavy-duty metal.


  • Heat exchanger: The heat exchanger is an integral component that carries the heat created by the burners to the water in the boiler. Heat exchangers are commonly made of cast iron, stainless steel or copper.


  • Controls: System controls allow the user to calibrate water temperature, air and fuel supply mixtures, ignition and internal pressure. The controls regulate when and how often the burner fires, the temperature of the water, the rate at which fuel is used and the quality of the mixture of fuel and oxygen. Commercial boilers can also be fitted with appropriate safety controls that make sure that the internal pressures in the boiler doesn’t get too high, the water temperature stays within a safe range and ensures that the system continues to operate properly.


  • Exhaust stack: Also called the flue, the exhaust stack is the series of pipes that divert the exhaust gases away from the inside of the building to the outside. The exhaust stack must be constructed to ensure that any dangerous gases such as carbon monoxide are safely vented away from the interior of your facility.



Boiler Safety and Maintenance

Commercial boilers can be unpredictable systems containing very hot water under high pressure. Therefore, care must be taken to make sure the boiler is clean and working properly and that all safety systems are functional and ready to work if required. Hot water leaks can pose a serious risk of causing injuries or damage. Commercial boilers can potentially explode in the worst circumstances, which can result in serious injuries or even death as well as significant damage to your commercial facility.

It is imperative that your commercial boiler receives regular preventive maintenance from a professional heating engineer. This maintenance not only ensures the system works correctly and at its highest level of efficiency but that it also works safely.

Here at Flexiheat UK, we realise that finding and purchasing a new commercial boiler is a complicated business. This is made far worse by the confusing terms used to describe boilers. This is our guide to these commercial boiler technical terms, to help make your search easier.


The term condensate is used regularly. Throughout the process of producing heat, the boiler will produce some condensation of the flue gases in a condensing boiler. This needs to leave your building or premises normally through an outside wall. In addition, some of the condensation will turn to liquid and need draining away. This is normally through a pipe that connects to your pre-existing drainage system.

Condensing Technology

This term has increased in popularity, as modern boilers are all fitted with condensing technology. This means it is capable of condensing the gas into heat for your business. The benefit of condensing technology is that a lot more of the waste gases are recycled and turned into more heat, which is far more cost effective and better for the environment.

Flow Rate

Flow rate is a term used to describe the amount of hot water that is produced in one minute. This is mainly relevant to combi-boilers, which do both the heating and hot water requirements. The higher the flow rate, the more water produced which means your boiler can work for less time and use less fuel. Essentially a commercial boiler with a good flow rate will save you money on your bills, whilst satisfying your hot water requirements . Commercial combi boilers are the ideal boilers for smaller commercial property applications.

ErP Rating

This term refers to the A++ to G ratings, shown on all new boilers. Referring to the boiler’s energy efficiency as well as its heating and hot water performance, the rating allows you to choose the most efficient boiler. A++ is the highest performing and G is the lowest.


This term means: Seasonal Efficiency of Domestic Boilers in the UK. It is a percentage rating for boiler efficiency and it has been added as part of the overall ErP rating.


We at Flexiheat UK hope this glossary helps make choosing a new commercial boiler a little easier. Don’t let the commercial boiler technical terms give you a headache!

For any help,advice, latest offers or more information , don’t hesitate to contact us today on 01202 822221 or click here for our email contact form.

Blow Heaters UK

Blow Heaters

Blow heaters are fundamentally any type of heater that is assisted via a fan – thus sometimes referred to as a fan heaters.  As the term suggests, heat is expelled at a higher rate resulting in faster movement of warm air thus ensuring a more efficient and accurate heat delivery.  There are a range of blow heaters on the market. The most common of these is Electric Fan Heaters  which function by heating a coil or a heating conduct or even ceramic heaters. The cold air is led along this heating coil and heated. A fan is then used to transport or circulate the heated air into the entire room.

Electric fan heaters are usually compact and space-saving, which means they can be used almost everywhere and are super-flexible as far as the location is concerned. Only a power connection and a little space is all that’s required.  They are used for heating rooms such as garages, greenhouses, tents and the like. They are often used as additional heating in the home or living area, because of their fast and effective way of heating the entire room.

Thermostatic control is an important element for controlling any fan heater, to ensure the heat is controlled to the required warmth level, and that the unit doesn’t over heats.

Blow Heaters

A fan heater is suitable to heat locations such as stock rooms in a shop to protect products from damp or freezing, or even heating the shop area to keep the customers warm. A fan heater can also be used as a garage heater warming the location to the desired level.

Common applications for fan heaters

Building industry • Heating and drying out rooms, often in conjunction with a dehumidifier.
Industry • Heating of offices, canteens, stores, warehouses etc.
Livestock • Heating poultry houses.
Horticulture • Heating of sorting areas and greenhouses.
Agriculture • Heating of livestock areas, dairy parlours, workshops and packing sheds.

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


Other popular types of fan heater are ones fuelled by gas, usually propane or liquefied petroleum gas or LPG, for short. Most gas fan heaters use a so-called piezoelectric igniter. A material, often crystal quartz, which has the property of developing an electrical potential when pressure is applied is housed in a mechanism that allows a spring strike hammer. This action generates a spark, igniting the gas within the fan heater.

Blow Heaters

Common applications of a gas fan heater

Livestock •

Heating of pig and poultry houses and sheds

Agriculture •

Drying of agricultural products.

Horticulture •

Heating of greenhouses and polytunnels (N.B. Control CO2 and CO emission)



Temperature control is a desirable feature in a gas blow heater. An automatic thermostat is a popular way to achieve this and some of the more sophisticated fan heater are fitted with a thermostat while others simply have a manual high and low flame control.


The main drawback of burning propane or other combustible materials, for that matter, in a small and enclosed space is the risk of carbon monoxide poisoning. Carbon monoxide is a product of irregular combustion. It is odourless and it competes with oxygen in the blood, which deprives the brain and other parts of the body of oxygen. Some propane heaters are approved for indoor use and some are not.


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



The advantages of fan heaters


  • Fan heaters heat the room quickly and effectively to the desired temperature.


  • No additional work is required to operate a blow heater. Only one socket and some space should be available.


  • The purchase costs of fan heaters are manageable.


  • Most models are equipped with practical carrying handles or tramples, so even if the case is still warm, they can easily be moved locally.


  • The most compact design of the devices allows them to be used in a very small space.


  • Due to the existing “cold stage”, the units can be used as a fan in summer.


  • Integrated or external time switches allow time-controlled use.


  • Many appliances can be used as frost monitors without an external thermostatic control unit.


Should you require more price information or require anymore assistance or information on our range of Blow Heaters , please don’t hesitate to contact our sales team on 01202 822221 or click here for our email contact form. We always supply an inc vat invoice for all products, with inc vat at the appropriate current rate and no exclusions apply.