Air working principle of water heater, do not need the electric heating element direct contact with water, but through the medium refrigerant to the heat transfer, evaporator refrigerant through absorbing low temperature heat in the air, after the compressor pressure into high temperature heat, then refrigerant release heat heating water, then the liquid refrigerant after expansion valve decompression back to start, so circulating.
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absorbing air back boiler circulating climate compressor contact convenience decompression device direct electric electrical element energy equipment evaporator expansion gas heat heater heating high home hot house household isolated line liquid low medium pipe pressure principle refrigerant release start system tank temperature thermal transfer valve vector water white working
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