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    Grundfos UPS 15-58FC strong enough?

    josephny
    josephny Member Posts: 346
    edited January 2024 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.

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    Comments

    • yellowdog
      yellowdog Member Posts: 260
      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: 346
      edited January 2024
      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: 2,337
      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: 2,179
      If this is a closed, pressurized system, then you’re way off base. Height is irrelevant in this situation. 
    • josephny
      josephny Member Posts: 346
      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: 346
      Hot_water_fan said:

      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: 24,925
      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

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