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New room radiant heat

 Adding a room 20x12  in floor radiant being added to a hw baseboard

system  if i branch off boiler outlet at 180 i know i need a mixer to lower

temp but for the room loop do i use valves or loop pumps to

add to existing system(one floor home.) if pumps what size?



  • CMadatMe
    CMadatMe Member Posts: 3,086
    You Need

    a  system pump after the mixing vlave for the radiant. What size. Generally a Taco 007 or Grundfos 15-58 but pump sizing is dependent on heat loss, flow rates and head of the system. Without knowing these parameters, your rolling the dice.
    "The bitter taste of a poor installation remains much longer than the sweet taste of the lowest price."
  • Russty
    Russty Member Posts: 2
    System Design


    I'm building a 30'x44' two-story addition to my home. The subfloor is already in, and I want to install hardwood on the second floor. I want to heat the second floor via Radient heat tubing added to the bottom of the subfloor.

    1. Where can I go to get a proper system design?

    2. Is it prudent to locate the boiler in the first floor (garage)?

    3. I live in NH, have natural gas, and need to heat my domestic water too. Should I use a boiler, a water heater or an on-demand unit?

    4. Will enough heat transfer through the subfloor and hardwood without having to raise the water temp high enough to cup the hardwood?

This discussion has been closed.