Class 1 Energy Rating, COP ≥ 4.2 Generates about 4.2kWh of energy to heat water with only 1kWh of electrical power. This helps to provide 4.2 times of savings as compared to conventional electrical water heaters. Microchannel high efficiency heat exchanger High pressure rating, large heat exchanger area and high heat transfer rate to improve the heat exchange efficiency of the heat pump system. High temperature heat pump system Heats up to 70°C with only heat pump system without cutting in of heating element. Fast heating and large volume hot water storage 5250W heating capacity and 400L tank capacity, ideal for residential and big scale of commercial applications Built-in circulation pump Instant hot water at the point of use, do not require external circulation pump for commercial applications. Wi-Fi remote control Smart wi-fi remote control and temperature monitoring through “Hi Rheem” Mobile App Wide ambient operating range (-7°to 43°C) Excellent adaptability, capable of operating in a wide range of ambient settings, from -7°to 43°C, to provide hot water regardless of temperature of external environment.