7 heat-pump models in EPRELCastle Electrical Factors LimitedModels7Top typeHP water heater (5)Top refrigerantR290 (2)Heat pump typesHP water heater5 (71%)Air-to-air2 (29%)RefrigerantsR2902 (29%)Top models by SCOPIGAC03012WAPR R290IGAC03009WAPPR R290HS553/7NCHS25UXCAQS8XAHS15UXCHW3ASee all 7 models →