heat pump water heater 1.High efficiency,safety,reliable 2.Automatic defrost 3.Safety, ... % compared with oil boiler, gas boiler, coal boiler, electricity water heater etc.Environment-friendly: ODP---Ozone Depletion Potential, GWP--Global Warming ... through heat exchanger.3)no potential hazards of inflammable, explosive, electric shock,gas poisoning. Model KFRS-90IIheating capacitykw87.4water flow rateL ...