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circulation pump in hot water system

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billd
billd Member Posts: 2
in THE MAIN WALL
A very old unmarked pump has failed, how do I know what to replace it with? Thinking about 3 speed Grundfos UP series.
One guy says 1 gallon per minute flow per 10,000 BTU, my boiler has 84,000BTU output.

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  • Ron Schroeder_2
    Ron Schroeder_2 Member Posts: 176


    A Grundfos UPS15-58FC or UPS15-58FRC will replace about 90% of the pumps on residential systems. The S means 3 speed. The FC has the flange bolts rotated 90 degrees from a Taco and the FRC has the flange bolts the same as Taco. The C means it has a built in check valve. The check valve is removable if you don't need it.
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