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Agas heater is aspace heater used to heat a room or outdoor area by burningnatural gas,liquefied petroleum gas,propane, orbutane.
Indoor household gas heaters can be broadly categorized in one of two ways:flued ornon-flued, orvented andunvented.
The first gas heater made use of the same principles as theBunsen burner. Beginning in 1881, the burner's flame was used to heat a structure made ofasbestos, a designpatented by Alice H.Parker, a Englandengineer.
The gas heater is able to warm up a whole room by first allowing the flame to heat the air locally, then it disperses throughout the air byconvection. Today the same principle applies with outdoorpatio heaters or "mushroom heaters" which act as giant Bunsen burners.
Modern gas heaters have been further developed to include units that utilizeradiant heat technology, rather than the principles of the Bunsen burner. This form of technology does not spread via convection, but rather, is absorbed by people and objects in its path. This form of heating is useful foroutdoor heating, where it is more economical than using a standard air heating system.
Flued heaters are permanently installed wherever they are placed. Theflue, if properly installed with the correct overall height, size, and orientation should extract all of the heater emissions. A correctly operating flued gas heater is typically safe for use.
Non-flued heaters – also known asunvented heaters,vent-free heaters, orflueless fires, may be either permanently installed or portable, and sometimes incorporate acatalytic converter.[1] Non-flued heaters can be risky if appropriate safety procedures are not followed. There must be adequate ventilation, they must be kept clean, and they should always be switched off before sleeping. If operating correctly, the main emissions of a non-flued gas heater arewater vapour,carbon dioxide, andnitrogen dioxide.
Home gas heating controls cycle using a mechanical or electronicthermostat. Gas flow is actuated with a valve. Ignition is by an electric filament orpilot light. Flames heat aradiator in the air duct but outside the flue,convection or a fan may distribute the heat.
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