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Circulator Pump Size/Location

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The only real reason to locate the circ on the supply side is for better air elimination. It won't necessarily delivery any more water any faster. It looks like a quality installation from the photos. I would suggest talking to a heating pro about splitting the loop. It is true that the last few rads will have less temp to work with, but if properly sized, they should work. It those rooms are cooler and uncomfortable, look into splitting the loop to deliver water in two directions. That will help balance out the flow and the BTU's. From the sound of your description of the system, the 010 should be enough pump to do the job. Can't say for sure without more details or photos, but I think you have an easy fix. IF comfort is not an issue, leave it be.

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  • L. P.
    L. P. Member Posts: 10
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    Circulator Pump Size/Location

    I purchased a home this year that had a new heater put in a year or two ago (Weil McLain CGI gas boiler). I have noticed that three radiators in my home are warm vs hot like the others. When I had a neighbor look at the system, he mentioned that I have a series loop system and when used with old cast iron radiators, the last few on the series are not as warm as the first few. I have since read about series loops and unfortunately, there is not much I can do at this point about the design of the system.

    However, it was brought to my attention that I have a Taco 010 circulator on the return side rather than on the supply side in front of the expansion/bladder tank (see attached photo). Do you think I would get a better flow if the circulator was moved in front of the expansion tank on the supply side? What about increasing the circulator to a larger size? Weil McLain CGI broucher mentioned a Taco 110 as as optional equipment. The series loop consists of 140 feet of one inch copper going around the perimeter of my basement, not including the risers to the second floor or the actual old cast iron radiators (6 1st floor & 5 second floor).

    I would appreciate any comments regarding the proper locatoin and/or size of a circulator for my system based on the information that I supplied. I wanted to get a good understanding from the experts @ Heating Help before I consult a plumber/heating contractor in my area.

    Thank you.
  • L. P.
    L. P. Member Posts: 10
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    Circulator Pump Size/Location

    Thank you for the information. At least I know that moving the circulator to the supply side will not provide any more water faster than what I'm getting by having it on the return supply.

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