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The purpose of this information is to provide users of flue-less gas space heaters with guidance on their safe use.
A flue-less gas space heater is a gas appliance that does not have a flue to collect and exhaust to an outside area, the products of combustion that result from burning gas in the appliance. This type of appliance releases all the combustion products directly into the room it is heating.
The combustion products produced by flue-less gas heaters include a number of pollutants such as nitrogen dioxide and carbon monoxide, which can be harmful to health. Water vapour is also produced and can directly affect health by increasing the growth of moulds and dust mites. The amounts of air pollutants produced by a flue-less gas heater can vary depending on the size and type of heater, its installation and how well it has been maintained. The level of air pollutants in the room will also vary depending on the way in which the heater is used, the size of the room and the amount of fresh air that enters the room through fixed ventilation openings.
Flue-less gas heaters are known to increase the level of pollutants inside a home. Recent research has found that at high levels, these pollutants can increase the incidence of symptoms in some people with respiratory sensitivities.
People with asthma are particularly susceptible to increased levels of indoor air pollutants and may experience asthma symptoms more often.
There are several things users can do to avoid or reduce exposure to pollutants from flue-less gas space heaters:
Further information on this subject may be obtained from relevant gas appliance manufacturers or their local representatives.
The information on this page is available in PDF format.