... DURABILITY 1. GREEN PRODUCTS, SAVES ENERGY.The COP of Product heat pump Water Heaters is 260~380%! up to 70% energy save ... install as a regular electric heater. There is no need for complicated and expensive special plumbing work.3. SAFTY.No ... type, and Aircon Heat-recovery type HPWH. Widely applied in house,apartment,hotel,school,hospital,etc Air Source Swimming Pool Heat Pump for commercial