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Home / Solar Water Heating / Circulating Pumps / Laing D5 Solar 720B Ecocirc PV Direct Circulating Pump, Sweated Connection / Reviews / Pump curve
Michael OBrien

Laing D5 Solar 720B Ecocirc PV Direct Circulating Pump, Sweated Connection

Written November 18, 2013

Pump curve

In my case, the D-5 wasnt able to pump even close to the head shown in the pump curve. The motor side of the pump works fine, but the machining of the pump volute is crude. I suspect the machining of the brass casting is the problem, but without a good one to compare it with, I have no way of knowing. I sent a picture of the crudely machined pump interior to Alt-E, but they havent compared it with pumps they have in stock, so I dont know whether all D-5 pumps are incapable of pumping promised head or whether I just have a bad one.

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