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 Model No. GT ... used: widly be used in swimming pool, SPA pool, Sauna pool and etc.10) ECO-friendly. GS,CE CERTIFICATE Loading SPA pool heat pump, spa pool heater, spa pool heat pump water heater