... quality This model is integrative pressurized solar water heater 2)CE,ISO9001:2008 Hybrid advantages of solar water heater and heat pump water heater. ... cloudy or rainy days, the water is heated by air energy 2) Safe, high efficiency, energy-saving and ... air, only 1/4 electricity consumption of electrical water heater 2) Utilizing high efficiency, environment protecting working substance 3) World ...