John Gayewski
In the Trades
It looks like from the info provided by the boiler a circulator capable of moving 4.4 gpm with 12 ft of head would get you less than 20 degrees of temp drop. For the primary loop.
Maybe go with something a little less powerful. A combi boiler wants cooler water returning to it. The longer it runs the better the effeciancy. Looks like you could go up to the 40 degree range of you wanted to.
Maybe go with something a little less powerful. A combi boiler wants cooler water returning to it. The longer it runs the better the effeciancy. Looks like you could go up to the 40 degree range of you wanted to.