Theodoor is China water heater manufacturer. Air source heat pump water heater is manufactured according to a new power-saving technology, which wins universal attention. It s also a new generation of power-saving environment protected device succeeding electric water heater, gas water heater and solar energy heater. Our air source heat pump water heater makes use of the cycle principle. It absorbs outside heat from the air with the help of compressor and refrigerating liquid and then transmits the heat to produce hot water. We offer various types of products such as air source heat pump water heater, air curtain, ventilating fan, welcome.