Household air source heat pump water heater Working Principle: A heat pump is mainly composed of compressor,condenser,expansion valve and evaporator,by making the working fluid constant evaporation(absorb heat from the environment)-compression-condensation(giving off heat)-flow restriction-re-evaporation,the thermodynamic cycle process transfer the heat from environment to the water. Heat pump water heater absorb low-grade heat in the air through the gasification of heat medium in the heat exchanger,using a small amount of electricity to drive the compressor to compress the heat medium into a high-temperature gas.The high temperature gas increase the water temperature to 50 60°C for domestic water or heating.Heat pump water heater absorbs heat directly from the air to produce hot water,so it can provide hot water in cloudy and rainy days,night and all the year round. Feature: 1) High efficiency and energy saving,electricity cost is only 1/4 of electric water heaters. 2) Automatic microcomputer control,operate properly all the year round and will not be influenced by the the climate 3) World to top brand compressor for heat pump-Wanbao compressor(OEM for Panasonic) 4) Automatic defrosting,continuously provide hot water even in cold areas 5) No waste heat,exhaust gas,waste residue,no pullution to the environment 6) Operating temperature:-8°C to 45 °C