... 3.Patent Titanium heat exchanger 4.CE & ETL Air To Water Pool Heat Pump, Spa heat pump, pool heater, Air ... of 15 years5) HIgh efficiency compressor with R410A refrigerant6) Flow switch for water flow protection7) Intelligent controller and adjustment by quick-mind microprocessor8 ... in the factory. CERTIFICATIONSCE, CB, EC, ETL, CETL, C-TICK, WATER MARK, STANDARD MARK, UL, SABS, SANS, SAA, SASO, VDE, ...