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Delta T for different applications

I’ve been searching but have come up empty for what i should aim for with different radiant delta T.
Staple up with heat transfer plates?
In slab?
In mortar with tiles?
Snow melt?

Thanks for anything


  • Ironman
    Ironman Member Posts: 7,350
    If it's living area, 10-12*.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • Dave H_2
    Dave H_2 Member Posts: 545
    It may also depend upon what you are looking to do and pipe size used. Typically a 10 degree temp drop for radiant floor heating is desired. It allows for a more even surface temp from one side of the room to the other. However sometimes you can design to wider delta's to accommodate installation ease.
    For example in my home i designed the second floor to a 15 degree delta so that when designing the number of loops for the bedrooms, every room needed only one loop instead of 2. Made install easier, the remote manifold smaller and the number of actuators needed less by 3. I could have left it at 10 degree delta and the same number of loops, but the head loss changed my circ size. I could have also upped the pipe size to 1/2", but 3/8" is so much easier to install between the joists.

    When it comes to snowmelt systems, design delta's can vary depending upon how critical the snowmelt system is needed for and pipe size used. Anywhere from 20 to 35 degree delta's

    Dave H
    Dave H
    ZmanSteve Thompson (Taco)McSteamer22