Heat pump water heater PRODUCER 1,9 years experiences 2,GS, CE, Certificate 3,R410A refrigerant 4,OEM service Heat pump for swimming pool/spaSpecification ... 20, wet bulb is 15,water inlet 15,water outlet 27.Features: 1) Durable: titanium metal water heat exchanger, resists the erosion ... 10) ECO-friendly. GS,CE CERTIFICATE Loading SPA pool heat pump, spa pool heater, spa pool heat pump water heater