I recently had to replace the circulator pump on my non-pressurized wood doctor. The pump the stove was installed with was a Grundfos UP26-99 which is no longer available. They crossed it to a Grundfos UPS26-99 3-speed pump. The problem I am having is it doesn’t seem to be producing enough heat to my forced air plenum. Last winter I had all kinds of heat and even cracked the windows all winter long. Now, I can’t seem to get enough heat blowing up thru the floor grates. I measured the temperature at the grate and it is only 26 Celcius therefore causing the blower to run continuosly to bring my home up to a warm temperature. I have tried draining some water from the supply line ahead of the circulator and also removed the coil in the plenum to see if it was plugged. I also tried all 3 speeds on the circulator with same results. The supply side of the coil is very hot to touch but the return is not. This new UPS26-99 circulator has a check valve in it where the original didnt.
It is getting pretty cold these days and any help or suggestions would bve appreciated.
Thank you,
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Topic: Little heat after circulator replacement (Read 3263 times)