The  UPS3 is a compact, high efficiency replacement for Grundfos UPS and UPS2 15-50/60 circulator pumps and many internal boiler pumps. Suitable for domestic heating systems with boilers up to 30kW,  one model of UPS3 can be used to replace all previous 4m, 5m and 6m head versions of UPS and UPS2 pumps. Using the GO Replace application suitability for replacing a wide range of internal boiler pumps can also be confirmed.