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    BadgerBoilerMN, I'm not sure what you mean by...

    BadgerBoilerMN, I'm not sure what you mean by phase change and control problem. For me, the control of the second pump is simple, it's just wired in paralleled with the first.

    Tom Sawyer, I...
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    Thank you!

    Thank you!
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    http://www.engineeringtoolbox.com/pumps-parallel-s...

    http://www.engineeringtoolbox.com/pumps-parallel-serial-d_636.html

    Pumps in parallel seem reasonable. I wonder if there's any issue with one being on the hot side and the other being on the...
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    two pumps in series

    I have a wood stove with a wet back. I'm using a Grundfos UPS 25-40 pump to circulate the water. Some of the radiators are not getting hot, particularly the ones far down the line. I had a heating...
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