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True variable speed pump

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MarylandJoe
MarylandJoe Member Posts: 1
in Radiant Heating
Does anyone know of a true variable speed pump. One that can drop down to 1 or 2 GPM?
I have an HEC-2 and it doesn't slow down that much. The basic application is hot water baseboard circulator configuration, but not exactly.
thank you

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  • Dave H_2
    Dave H_2 Member Posts: 556
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    Joe,
    The HEC-2 does have a minimum speed (see here http://www.taco-hvac.com/uploads/FileLibrary/100-101.pdf) for the performance curve. You can get to the low speed and achieve that 1-2 gpm you are looking for. 1 to 2 gallons or minute is 20,0000 BTU's on a design day. If your system is about that size, you are right, it will be hard to vary below that speed.

    How much baseboard is connected to your system?
    Also, are you looking for a variable speed circulator or a high efficient ECM circulator?

    Dave H
    Dave H

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