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Radiant schematic

The new house I bought has both radiant and baseboard heating currently installed. After doing some research I've discovered that the radiant heat portion isn't hooked up correctly and is cheaply rigged once it leaves the boiler ( no manifolds, uses same water temp as baseboard, etc.)

Here's a drawing of the current set up along with an actual picture.

I've also attached what I believe would be close to the new setup. I'm not sure if I'm missing anything so I could use some help.

One question I do have on my "new design" . Would I need two expansion tanks, one for the boiler side and one on the zone side?

Thanks ahead of time for any input.


  • ZmanZman Member Posts: 2,820
    Mixing block


    I mistakenly suggested an x block rather than a mixing  block. You don't need the heat exchanger.

     Here is the link

    There are some good drawings in the installation manual. I would use one expansion tank and put it on the boiler side upstream of the boiler circulator.

    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • NRT_RobNRT_Rob Member Posts: 1,009
    what kind of radiant is it?

    if it really needs the same temp as the baseboard, you could use reset on all of it.
    Rob Brown
    Designer for Rockport Mechanical
    in beautiful Rockport Maine.
  • BenWojBenWoj Member Posts: 33
    Radiant types

    Theres radiant in the underfloor between each joist ,slap radiant, as well as under flooring/ above sub-flooring on the second.
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