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Grundfos UPS 15-58FC strong enough?

josephny
josephny Member Posts: 270
edited January 26 in THE MAIN WALL
Is a Grundfos UPS 15-58FC strong enough to pump a 50% glycol mix to the 3rd floor of a house from the basement (approx 30')?

I read the literature and it seems like it is not, but I wanted to make sure because my supply house advised and sold me 5 of them.

Thanks.

Comments

  • yellowdog
    yellowdog Member Posts: 162
    height is handled by your boiler pressure. you need to know gallons per minute and feet of head to size a circ correctly. most likely the grundfos will work.
  • josephny
    josephny Member Posts: 270
    edited January 24
    No surprise that it is more complicated that I understood.

    Is the following info enough to determine if the pumps are appropriate:

    2gpm, 20 PSI, 3/4" pex-A.

    Top floor is 30' above pump and totals approximately 250' of 3/4" pex-A.

    2nd floor is 20' above pump and totals approximately 300' of 3/4" pex-A.

    1st floor has 4 zones, all 10' above pump:
    Zone 1: 250'
    Zone 2: 250'
    Zone 3: 300'
    Zone 4: 300'
  • GroundUp
    GroundUp Member Posts: 2,031
    The pressure is what lifts the water- pump size is largely irrelevant to height. 30ft would require about 13 psi, so at 20 as you stated, there would be no concern using the 15-58 to move 2 GPM through a 250ft loop of 3/4" pex. I am curious about your emitter(s) though- are you trying to just loop 3/4" tubing around the joists or what is emitting the BTU?
  • Hot_water_fan
    Hot_water_fan Member Posts: 2,014
    If this is a closed, pressurized system, then you’re way off base. Height is irrelevant in this situation. 
  • josephny
    josephny Member Posts: 270
    GroundUp said:

    The pressure is what lifts the water- pump size is largely irrelevant to height. 30ft would require about 13 psi, so at 20 as you stated, there would be no concern using the 15-58 to move 2 GPM through a 250ft loop of 3/4" pex. I am curious about your emitter(s) though- are you trying to just loop 3/4" tubing around the joists or what is emitting the BTU?

    Okay, I'm beginning to get a basic understanding.

    The emitters in all but 1 of the 6 zones are copper/fin-type baseboards. The other zone (in the floor joists in the ceiling of the basement) are in Uponor tracks.

    Thank you.
  • josephny
    josephny Member Posts: 270

    If this is a closed, pressurized system, then you’re way off base. Height is irrelevant in this situation. 


    That's great to know -- I was indeed way way off base. I'm pointed in the right direction now.

    Thank you.
    Hot_water_fan
  • hot_rod
    hot_rod Member Posts: 22,817
    50% is a fairly high % concentration, especially inside a building?
    That will cost you both pumping capacity and heat transfer
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    jringel