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  1. #1

    Radiant Floor Heating

    Hey folks...

    Totally redoing the basement (including lowering the floor) and I'm looking into radiant floor heating. I've heard conflicting information as to whether you can use a tankless water heater to feed the flooring as well as for regular ("potable") hot water duties.

    Any comments? On the above or experiences with radiant heating in general?

  2. #2
    Join Date
    Dec 2007
    Location
    oregon
    Posts
    885
    Quote Originally Posted by FredToronto View Post
    Hey folks...

    Totally redoing the basement (including lowering the floor) and I'm looking into radiant floor heating. I've heard conflicting information as to whether you can use a tankless water heater to feed the flooring as well as for regular ("potable") hot water duties.

    Any comments? On the above or experiences with radiant heating in general?
    You need a "hot box" to do that with a tankless.
    Genius = The guy who can do anything...except make a living!

  3. #3
    Join Date
    Mar 2008
    Location
    Taunton, MA
    Posts
    93
    usually get bearly enough hot water out of a tankless to wash, will the boiler put out the BTUs, maybe a secondry radiant loop off the boiler or a large hot water unit to do both the radiant and potable hot water

  4. #4
    Join Date
    Apr 2004
    Posts
    420
    I've seen this done, but the customer had a storage (buffer) tank in between the the source and the load so as to keep the water heater from cycling excessively at low temps. Loop was pumped from the buffer tank, which contained a heat exchanger off the heater. You get the picture. Any radiant specialist could undoubtedly explain it better. Also, check out the wall at www.heatinghelp.com.

  5. #5
    Join Date
    Feb 2003
    Posts
    1,996

    As suggested

    Using an indirect with 2 coils would help. You heat the tank to 120 degrees
    through 1 coil from the water heater. This would also become your potable hot water supply. The second coil would feed your radiant. Now you have some buffering for your hot water and you prevent the radiant loop from ever getting too hot.

  6. #6
    Join Date
    Dec 2007
    Posts
    12
    I see people do it all the time, system works fine as long as is designed correctly, the problem is that, many manufactures dont allow recirculating in their tankless, it will void the warranty, and you have to keep an eye on your return water temperature, ( can't bring it back too hot )

  7. #7
    Join Date
    Jul 2000
    Location
    Northern Wisconsin
    Posts
    2,037
    http://www.quietside.com/QS08/Sub_Product/QSDPHS.asp

    Why not get a unit that is already designed an built to do what you're planning?
    Use the biggest hammer you like, pounding a square peg into a round hole does not equal a proper fit.

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