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Need your thoughts.

SeanBeans Member Posts: 520
Gravity hot water system.
New cast iron boiler.
Primary secondary piping.
Side arm off of this boiler.
....pool heater off same boiler.

Please chime in with whatever your thoughts are!!

How can this be done right and safely


  • Zman
    Zman Member Posts: 7,569
    Why not mod/con boiler?
    Primary secondary for sure.
    Smart mixing valve with outdoor reset on gravity side.
    Pool heater and circ should be separate from gravity.
    Do you have a sketch of what you are thinking?
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • Ironman
    Ironman Member Posts: 7,375
    Load calcs for both the house and the pool are necessary. Unless it's a very larger load for the house, the boiler may not be sufficient for the pool.

    Using a CI boiler to heat a pool is not a wise choice and will require boiler protection controls. It will also require the chimney to be properly lined and insulated. A mod/con would be less expensive and more efficient.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • Zman
    Zman Member Posts: 7,569
    @SeanBeans I did a similar project up the hill from you with snow melt, radiant space heat and outdoor pools and hot tubs. We estimated the switch to mod/con would save them 20%. When we saw the actual year over savings it was ~32%.
    Send me a PM if you want to a copy of the design.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • ChrisJ
    ChrisJ Member Posts: 15,667
    I could really go for some bacon right now.
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment