Forum Title: Bell & Gossett series 100 pump
Question about the B&G series 100 pump: Is it possible for the pump to lose its ability to pump even though the motor is running fine? I am asking because my hot water circulation is no longer working and I have ruled out air lock and other obstructions. The pump just seems to no longer pump. It sounds fine - motor is rotating, the pump impeller and shaft are tight and strong (not sheared). There is some circulation, just very very slow. 4 hours to warm the pipes that normally took 5 minutes. The only thing different is that the pump body (where the impeller fits into) was badly rusted and pitted (since cleaned) and I think perhaps the impeller no longer is fitting snugly in order to create a "draw" and move the water into the impeller and sling it out the edges. Has anyone experienced this? I'm prepared to buy a whole new pump because I think part "p00351" is bad. I would replace it with the NRF-22 Very strange ... the pump is only 5 years old (cast iron) and worked normally only a few hours a day (morning showers).
Category: Plumber Post By: DONNA MARTIN (Albany, OR), 04/12/2016

Which pump are you using, a bronze body or a iron body? If you at using a iron body on a domestic system it is more then likely plugged with rust. That pump is designed to be used on a heating system.

- MARSHALL DOYLE (Springdale, AR), 09/02/2017

Yeah most likely the line going into the heaters plugged

- BARBARA ROWN (Kansas City, MO), 09/07/2017

Quote: Originally Posted by johnjh2o Which pump are you using, a bronze body or a iron body? If you at using a iron body on a domestic system it is more then likely plugged with rust. That pump is designed to be used on a heating system. It's an iron body. When I took it apart the pump body where the impeller sits was loaded with rust - not completely, but enough. I thought I had found my problem. I cleaned it out and re-assembled. But no change in operation. Today, I will dismantled the pipe below leading into the water heater. It's possible that rust settled down and is plugging the pipe itself. It doesn't seem like it since water does flow when I open the valve.

- HARRY HOWARD (Tempe, AZ), 09/16/2017

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