Model HWB-A12 wall boiler is an endurable and compact gas boiler supplying hot water for space heating and domestic hot water in one unit with efficiency above 90%. Installed indoor, it is rather safe thanks to its sealed combustion system not taking air in the room and exhaust gas is forced out of the house by a built-in blower. Available in 4 output size18kW, 24kW，28kW，32kW, and comes with two versions, bithermal version and double heat exchangers version.
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