Central heating
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Warm air units - repairs and servicing

warm air unitsWarm Air units can be an efficient alternative to traditional central heating systems. The most common means of firing a warm air unit is through natural gas, although oil and electric alternatives are available. The main benefit associated with warm air units is the fast direct heating of air which can be delivered straight to where it is needed. A warm air system incorporates a fan which is used to deliver the warmed air (produced by the warm air heater) into the various rooms through either ceiling grilles, side wall registers or floor grilles at a velocity which is effective and yet does not cause discomfort.


How they work


Warm Air heating works by drawing cold air into the appliance where it is blown across a heat exchanger by an electric fan. This heated air is then circulated around the property by way of ducts allowing the warmed air to pass into the rooms. The cooled air is then drawn back to the appliance, via return ducts, where the process repeats itself.


how a warm air unit worksOne of the main criticisms of warm air systems is the potential to cause draughts, although this may have been an issue with early models, newer models on the market have made some additions that address this potential issue. Some warm air systems work on a basic on/off mechanism, Johnson and Starley have developed a more advanced electronically controlled modulating system. This system is known as 'Modairflow' which automatically alters the rate at which air is delivered to a room in relation to the temperature. In this system the fan speed and indeed temperature are carefully modulated to ensure that the system responds not only more efficiently but more effectively. These systems can also be fitted with an optional air cleaner that can assist in cleaning the air whilst it is being heated.

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Advantages and disadvantages


Advantages of warm air units

  • Rapid response for heating requirements
  • Water leaks, sticking valves, sludge, pumps, etc, that with wet radiator systems can cause breakdown and premature failure are not a problem with warm air
  • Controlled ventilation
  • Longer service life
  • Optional air cleaner can be applied to clean air from particles, pollen, tobacco smoke and other air intolerance's.

Disadvantages of warm air units

  • Older systems may suffer with an inefficient on/off mechanism
  • Expensive to install
  • May cause problems to asthma sufferers
  • Dust movement may cause problems
  • Pilot goes out repeatedly or fails to light easily
  • Flame sounds like it is roaring or appears to lift off the burner

















Even though there does appear to more advantages over disadvantages warm air units are only normally associated with new build houses as they would be very expensive to retro fit into an older house. Also it must be noted that the only manufacturer of warm air units are Johnston and Starley, choice is somewhat limited.

What we offer


Although we do not install or supply warm air systems, we do repair and service domestic warm air appliances as well as all necessary safety inspections and certification for landlords and homeowners.


Please contact us to discuss your requirements:corgi and oftec approved


TG Services

1 Wintershill Farm

Wintershill Estate

Durley, Southampton

SO32 2AH

Tel: 02380 000701



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