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It can't be right!

KABOOM Member Posts: 2
edited June 2016 in Radiant Heating
Interesting place you have here!

I did a drawing after doing a little research, but I am not sure I have it correct and I know I am missing where the shut off valves, unions, gauges, etc...go.

I am needing to use (hoping to use) circulators in the Grudfos Alpha or some other variation B&G or Taco ECM's because the studio runs off battery power (and generator to keep the batteries topped up) so if we can keep the power use down, this would be great.
What are the chances I can use these pumps on this boiler and floor?

Here are the specifics.

Slab on grade
One zone
4 loops
each loop is 230' (+/-)
The boiler is an Allied Boiler (Super Hot) Mini Gas-50 http://alliedboilers.com/wp-content/ProductDocuments/MG/MG Installation & Service Manual (S9361A).pdf

Thanks for any additions!

Is this a reasonable start?


  • STEVEusaPA
    STEVEusaPA Member Posts: 6,506
    edited June 2016
    i think one of these designs would be better
    Paul S_3
    KABOOM Member Posts: 2
    Good Morning Steve,
    Thanks for that.

    I am having the non o2 pex issue, so isolation is a must. Or at least this is the impression I get. Though I have had others tell me it is is overblown as an issue. Though I tend to lean to the side of better to be safe than blown up.

  • Ironman
    Ironman Member Posts: 7,376
    What's gonna control the SWT to the slab?
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • Zman
    Zman Member Posts: 7,569
    The cast iron boilers and ecm circulators are a good choice given your energy restraints.

    You might consider using a taco I series 3way valve on the other (radiant) side of the heat exchanger instead of the valve you have on the boiler side. Moving the valve would give you consistent flow though the boiler and provide some control "finesse" on the slab side.

    You could put the return water sensor on the boiler side to prevent boiler condensation and the supply temp sensor on the radiant supply in order to get your outdoor reset control.

    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • Rich_49
    Rich_49 Member Posts: 2,766
    What is the design load of the Studio to be heated ?

    Will you be using outdoor reset ?

    What temp do you require for the radiant at design conditions ?

    You didn't get what you didn't pay for and it will never be what you thought it would .
    Langans Plumbing & Heating LLC
    Serving most of New Jersey, Eastern Pa .
    Consultation, Design & Installation anywhere
    Rich McGrath 732-581-3833