Does anyone use a Grundfos Alpa ? Im thinking about installing one on the bridge supplying my primary loop,and also one on the bridge supplying my Gas Boiler heating system from the primary loop. What gives the Alpha the signal to speed up or slow down . Does it stop circulating completely when there is no demand? Also I've looked at the drawings of it and I cant figure out what size the inlets and outlets are, I am assuming you can use it on 1" and 1-1/4" pipe.
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