... metal water heat exchanger bulit-in, which resists the erosion from chlorine in the water, creates a longer lifespan. 2) Economical and ... are insulated, no open fire, no creepage. 6) Quiet: Using the high-efficiency, low sound rotary or scroll compressor, low noisefan ... machine.7) For Sunte swimming pool heat pump, has the DC inverter, Soft Star, Stainless steel shell for option Code SWBR-21 ...