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domestic and radiant with an on demand

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Sol Hydronics
Sol Hydronics Member Posts: 41
in Radiant Heating
I have found a plumbing diagram to plumb an on demand for radiant and domestic by Takagi but I dont like it since all the water goes through the flat plate exchanger. Would anyone have any good ideas for this application. Oh ya this is the home owners idea and not my recomendation. Thanks, mike

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  • Sol Hydronics
    Sol Hydronics Member Posts: 41
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    no response

    It looks like no one has any good ideas for this application
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,011
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    Radiant w/ Indirect

    No diagram; only a photo using a Taco X-Pump Block and a Noritz indirect.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • Sol Hydronics
    Sol Hydronics Member Posts: 41
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    Thanks

    I see the pic, nice work, and is this also taking care of domestic?, mike
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,011
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    Domestic

    Yes, it is.  Here is a better picture showing the domestic lines on the right side of the indirect.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • Charlie from wmass
    Charlie from wmass Member Posts: 4,322
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    Please check your local codes

    while Alan has done a great job here it would not be allowed in Massachusetts due to the plumbing code.
    Cost is what you spend , value is what you get.

    cell # 413-841-6726
    https://heatinghelp.com/find-a-contractor/detail/charles-garrity-plumbing-and-heating
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,011
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    Mass.

    I know you have some strict codes, but if Noritz, Takagi and/or Rinnai approve the use for combined DHW/radiant, what in the code prevents it?
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • Mark Eatherton
    Mark Eatherton Member Posts: 5,853
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    I'm thinking, he's thinking, you're thinking......

    I'll bet he thinks you're doing a direct with potable water, and not using the heat exchangers that you are.



    But who knows for sure, it is after all, the peoples republic of Massachusetts. :-)



    ME

    There was an error rendering this rich post.

  • Charlie from wmass
    Charlie from wmass Member Posts: 4,322
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    Yes Mark

    I was thinking the domestic and the radiant water were common.
    Cost is what you spend , value is what you get.

    cell # 413-841-6726
    https://heatinghelp.com/find-a-contractor/detail/charles-garrity-plumbing-and-heating
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,011
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    Heaven forbid

    I've done one open system in my life; 20 years ago when I didn't know any  better.



    There's a single wall heat exchanger (HX) in that Taco X-Pump Block.  Yewsta'  be that you couldn't install a single wall HX in Oakland or SF per the Uniform Plumbing Code, but they allow them now, thank goodness.



    You got anything against single wall HX's out there in Mass.?
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • Charlie from wmass
    Charlie from wmass Member Posts: 4,322
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    I do but code don't

    Just kidding Alan. Nice neat job and glad you straightened me out on the facts.
    Cost is what you spend , value is what you get.

    cell # 413-841-6726
    https://heatinghelp.com/find-a-contractor/detail/charles-garrity-plumbing-and-heating
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