Gas Unit Heaters

Gas Unit Heaters – Natural Gas or LPG Gas

vertical gas fired unit heater, centrifugal fan gas unit heater for ducted heating

Output Range – 13 kW to 73 kW

Gas Unit Heaters from Flexiheat UK provide a cost effective and efficient warm air heating solution for industrial and commercial buildings. They have been designed in conjunction with installers, consultants and end users in mind, to provide the perfect solution to your warm air heating needs. The “FHATX” series of gas unit heaters are suitable for indoor installation  and thanks to the closed combustion chamber and atmospheric burner, the “FHATX” gas fired unit heaters achieve up to 95% efficiency, and fully comply with the ERP regulations for warm air heaters that came into force on the 1st January 2020 – known as ErP Lot 21 – 2021, which now requires warm air heaters that provide warmth and comfort for personnel to have a seasonal efficiency of 78% as a minimum, as well as reduced NOx emission levels for gas at 70mg/kWh, to help minimise the impact of global warming .These gas unit heaters are the perfect solution for  Gas Warm Air Heating for warehouse heating, factory heating, or a workshop heater for example. They can be wall mounted , or suspended from the ceiling, saving valuable floor space, that can be put to better use.

Gas Unit Heaters – The Range

We can offer the following

The FHATX-H Range – which comprises of 5 models with Axial fan for horizontal blowing. These models offer an output range from 13 kW to 73 kW

The FHATX-C Range – which comprises of 5 models with Centrifugal fan for ducting applications. These models offer an output range from 13 kW to 73 kW

The FHATX-V Range – which comprises of 5 models with high efficiency and are suitable for vertical mounting applications -i.e. blowing warm air downwards. These models offer an output range from 13kw to 73 kW

All units can be used in a room sealed configuration, with the combustion air being taken from the exterior of the building being heated.


Gas Unit Heater Options – free blowing or ducted; unit heaters gas fired;

Industrial Gas Unit Heaters Applications

  • Warehouse Heating
  • Car Garage Heating , both the Workshop and the Showroom areas
  • Factory Heating
  • Retail Heating
  • Agricultural Heating
  • Sport Hall Heating
  • Workshop Heating
  • Garden Centre Heating
  • Greenhouse Heating
  • Garage Workshop Heating
  • Aircraft Hanger Heating
  • Distribution Centre Heating
  • Horticultural Heating
  • Rail Shed Heating
  • Industrial Manufacturing Heating
  • Showroom Heating

Performances and Dimensions of the “FHATX” Gas Fired Unit Heaters – ERP Rated as per EU ErP Lot 21 – 2021 – Warm air Heaters 

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Gas Unit Heaters; dimensions of gas fired unit heaters

Dimensions of the FHATX series gas fired unit heaters from Flexiheat UK



Download the Gas unit heaters brochure – FHATX series

Download Flexiheat Manual for FHATX Gas Unit Heaters

Gas Fired Unit Heater – Product Advantages
  • Atmospheric burner, with 2 stages – Hi / Low for the best efficiency, and to keep your fuel costs minimal
  • 2 mm thickness heat exchanger with seamless pipe
  • 4 – route heat exchanger
  • Compact device
  • Double louver series
  • Automatic security system
  • Horizontal heat exchanger
  • Pilot wired card
  • Regulation of several gas fired unit heaters with only one thermostat



Gas Unit Heaters – Customer Benefits
  • Thermal efficiency of 92% on high fire or 95 % on low fire
  • Efficient heat exchange, long life service
  • Maximum use of combustion energy
  • Rapid and easy installation
  • Efficient air distribution
  • Safe use
  • Low height of device, useful for buildings with low ceilings

The standard range are an axial fan , two stage burners in natural gas or LPG .



Mounting Options

These gas unit heaters have three mounting options:
Swivelling console– for mounting on walls, consisting of 2 plates and 2 lateral supports. The air heater can be placed on top of the console or suspended from it. The device can be swivelled horizontally through 180° for placement in corners of the building . This bracket is available for all models except the 75 & 95 models


Wall console bracket

Wall Mounting Brackets – For wall mounting, consisting of two steel brackets. The heater can be placed on top of both supports and can also be suspended from them. Suitable for all heater models.


Wall Bracket Set
Threaded tapping’s for suspension from the ceiling. On top of theses gas unit heaters are M8 fastening points in which threaded rod , or threaded eyelets can be inserted. Thus you can suspend the units from chain or rod depending on your preference.

Room Sealed Unit Heaters – Versatile Flue Installations

The balanced flue terminal provides both the combustion air inlet and flue outlet from a single building penetration. The terminals are ordered separately from the heaters to suit either a wall outlet or roof outlet. Additional flue and combustion air pipes may be added, up to a maximum of six metres of flue pipe, plus six metres of combustion air pipe. (This reduces by one metre for every 90° bend fitted). To comply with CE approvals, balanced flue appliances must be used with the manufacturer’s balanced flue system. The units are also certified for fan assisted flue installations, where the combustion air is to be drawn from within the heated space; an alternative wall or roof terminal is required for this application.

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Gas Fired Unit Heaters Flue Configurations – FHATX Range from Flexiheat UK


Gas Unit Heaters – Installation Notes
A single phase electrical supply is required to each unit. This supply should not be switched off except for maintenance. These gas fired unit heaters must not be installed in atmospheres containing flammable or explosive vapours, combustible dust, halogenated hydrocarbons or chlorinated vapours. They are also unsuitable for areas where contaminants may affect electrical motors or connections.
You may call these warm air heaters – gas fired unit heaters, factory heaters , propane workshop heaters , propane warehouse heaters ,commercial unit heaters, ceiling mounted space heaters, unit heaters natural gas , ceiling mounted space heater- whatever you call them , we have the solution for your requirements with our gas unit heaters. Call us now to discuss your requirements, or drop us an email via our contact form.