Suspended Gas Heaters – Natural Gas or LPG

Gas suspended heaters – Output range 6.2 kW to 115 kW – Premium Range-  Stainless Steel Heat Exchanger & Combustion Chamber – ErP 2021 warm air heating appliances compliant (Lot 21 – 2021) 

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Suspended gas heaters  -These Flexiheat range of gas fired suspended warm air  heaters are indirect gas fired suspended unit heaters, which have been designed for use in commercial or industrial warm air heating of shops, supermarkets, factories or warehouse premises where floor space is at a premium.

The main advantages of these gas fired heaters is the space-saving wall mounted or suspended installation options with efficiency, energy saving, comfort and reliability in a compact design that is specially designed for indoor areas that are tight for space. The units are fitted on a wall /pillar or even suspended, via a console or suspension chains – ensuring the entire area under the appliance can be used.

The extremely high thermal efficiency of these commercial gas fired heaters, combined with the modulating burner, ensures not only good fuel savings, but also reduced operating costs of over 30% compared to older, outdated commercial gas heaters.

The Flexiheat gas fired suspended heaters can be supplied in axial fan free blowing format, to be installed directly into the space to be heated, or with a centrifugal fan for ducted warm air applications. Heaters are generally arranged for on/off operation however they may also be specified with high/low heat output.

The warm air is distributed via the discharge louvers into the space being heated.

Hanging Gas Fired Warm Air Heaters – Product Features

  • The premix burner ensures the perfect mixing of the gas with the combustion air to obtaining a semi-radiant flame with very low emissions of nitrogen oxides or NOx – This ensures the units are ErP compliant 2021 with Class 5 emissions.
  • Choice of  heat outputs from 6.2 kW to 115 kW
  • These warm air heaters are up to 106% efficient
  • Natural gas or LPG options are available
  • Heat and corrosion resistant stainless steel heat exchanger and combustion chamber
  • Compact suspended commercial warm air heater
  • Up to 10 Years Complete Warranty on the heat exchanger (The Warranty is subject to the condition that the yearly maintenance is carried out on the heaters)
  • Axial or centrifugal fan option, for ducted warm air applications
  • Indirect gas fired with exhaust fan
  • Most heaters are 240Volt / 1 phase powered, except for the largest 115kW model – which is 400Volt / 3 Phase
  • Temperature control with summer and winter modes

Heater Models Available

The most popular hanging or suspend heaters, that are gas fired are our free blowing models. these heaters are fitted with axial fans and discharge warmed air directly into the heated space via adjustable louvered horizontal grilles. This range is know as the PMX range.

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Product data of the gas fired suspended heaters from Flexiheat UK

Ducted suspended warm air heaters

You also have the option of centrifugal fan fitted to these hanging gas heaters, which allows them to be fitted to a ducted warm air heating system. These ducted warm air heaters gives many options for your commercial or industrial warm air heating system, allowing you to heat and mix both external air and the return air from the environment. This range is designated the “CMX” and all units are equipped with centrifugal fans with high energy efficiency motors to ensure the air pressure necessary for distribution through air ducts and diffusers. Therefor all of this range use three phase motors, powered by a 400 Volt electric supply.

These ducted suspended heaters are often used in the heating of industrial and commercial environments, such as warehouses, supermarkets, sports and entertainment facilities, etc.

  • CMX Range- Condensing suspended gas fired room sealed heaters with modulation with centrifugal close coupled fan units from 10 kW to 115 kW output for use in ducted warm air systems, with the options of fresh air inlet, External Mounting and ducting in the warm air etc, these units can also be  mounted externally, with the addition of a special external kit.
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Gas fired Suspended Ducted Warm Air Heaters – CMX Range – From Flexiheat UK

The “CMX” centrifugal fan models are fitted with a centrifugal fan close-coupled directly to the heater casing, like the picture below

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The close coupled centrifugal fan fitted allows these suspendered gas fired heaters to be used in a commercial or industrial ducted warm air system.

This suspended heater range has been designed for use in factory or warehouse premises where gas firing is a requirement and floor space is at a premium.

Flue configurations for these commercial gas heaters

Our suspended heaters can be installed in either room sealed or flue only configuration – taking the combustion air from the environment being heated. Each suspended heater requires a separate flue and/or combustion air intake system of the appropriate size and type, and you should only fit our appropriate approved flue components / system.

The flue system can be installed in either a horizontal or vertical plane, and must be adequately supported and terminated with the approved flue terminal kit.

In either case the number of bends kept to a minimum and attention must be given to the reduction in permissible flue length with the addition of each 45 or 90 degree bend. Maximum flue lengths apply and should be strictly adhered to.

Combustion air requirements for non room sealed flue configuration

If the suspended gas heater is installed in flue only configuration (taking combustion air from the room) and directly within the heated area, and this area has a natural ventilation rate greater than 0.5 air changes / hour then additional ventilation is often not required. However, if this area has a natural ventilation rate of less than 0.5 air changes/ hour then either additional natural ventilation grilles or mechanical ventilation will be required.

Commercial suspended gas heater installation requirements

Suspended gas fired warm air heaters should not be installed in locations where there are corrosion or flammable inducing gases, vapours or particles that could enter the combustion air system or the fan assembly.


All Flexiheat UK heaters are type tested to meet the stringent requirements the Gas Directive and are CE approved