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The gas boiler is a device for heating premises for various purposes and for heating water for household or other needs. The release of thermal energy in it occurs due to the combustion of gaseous fuel. As the latter in gas boilers, natural gas is used — butane, methane, propane. This is due to the fact that this type of fuel is the most common, economical and relatively cheap. Currently, you can buy a gas boiler both floor (placed directly on the floor or on a special platform) and wall (mounted on a wall or special frame). Single -circuit boilers are designed only for heating the premises, the function of heating water is possible only if the capacitive water heater is connected. Double -circuit boilers make it possible to heating the premises and heating water for the needs of the hot water.