Mark DeJesus April 17, 2018 Installation manual for the differential controller states a Grunfos HE is needed for speed control. I have a Grundfos Alpha2 circulator, is this compatible? ReplyExpand Hide 1 Reply
Installation manual for the differential controller states a Grunfos HE is needed for speed control. I have a Grundfos Alpha2 circulator, is this compatible?