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X-Pump Block with an "on demand" water heater

Alan (California Radiant) Forbes
Alan (California Radiant) Forbes Member Posts: 3,615
edited April 2019 in THE MAIN WALL
Has anyone ever had to add a pump to the on-board Taco 008 to overcome the high pressure drop of the "on-demand" HX?


8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hourTwo btu/ per sq ft for degree difference for a slab

Comments

  • Dave H_2
    Dave H_2 Member Posts: 526
    It should be enough, but then there is always, it depends........

    I wrote a blog several years ago about this, take a look here

    Dave H.
    Dave H
    Alan (California Radiant) ForbesZman
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 3,615
    Thanks, Dave!

    That picture you used at the end of your article is from one of our jobs in Berkeley.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hourTwo btu/ per sq ft for degree difference for a slab
  • ScottSecor
    ScottSecor Member Posts: 679
    We've used the X block numerous times with very positive results, never needed an additional pump. Its been a few years since we installed one but I'm pretty sure the specs were pretty clear with regard to head and gpm. What are you heating with the X block?
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 3,615
    We're using Ecowarm panels to heat about 700 []. You can see them in the photo.

    This is the first time we've used Ecowarm. I like the product because it's plywood (3/4") and uses 1/2" PEX.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hourTwo btu/ per sq ft for degree difference for a slab
  • Dave H_2
    Dave H_2 Member Posts: 526
    Thanks for letting me know where that photo came from. It was in a library, I will tag it properly.

    Enjoy
    Dave H
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 3,615
    That job was for Mr. & Mrs. Pickle.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hourTwo btu/ per sq ft for degree difference for a slab

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