The unit adopts high-quality accessories from international brands, which are stable, efficient, and durable; Ultra low temperature operation technology ensures that the equipment can provide a continuous and stable supply of constant temperature hot water even in extreme weather conditions; Adopting intelligent defrosting technology to automatically detect defrosting temperature and improve the working efficiency of the heat pump; Adopting a super large area air exchanger, with a larger heat exchange area and stronger heating capacity; Adopting multiple intelligent protections to effectively ensure safe and reliable operation in normal environments; The unit obtains a large amount of free heat from the air and converts it into 3-4 times the heat energy through electricity to provide hot water, with high energy conversion rate and energy-saving and environmental protection; The control system can accurately detect the water temperature in the water tank and intelligently control the operation of the heat pump as needed to achieve a long-lasting constant temperature.