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radiant Wall Vs Panelrad capability

Dave_4 Member Posts: 1,405
I have several exposed walls upstairs that I am considering Radiant wall ??? of whatever type ( i'm looking for install Pics) Vs. panelrads in some spots . I'm aware It's not really a True comparison, But is the capability there to heat this and keeps the return temps low (Mod-Con). Do I need a high point Air Bleed on a wall loop??? Design considerations??. Can the wall be heated behind ceramic in a Bath that is applied with Mastic?? What is a safe Max temp for Paint on a given wall?? Thanks Paul


  • ALH_4
    ALH_4 Member Posts: 1,790
    Radiant Walls

    Here's a link to an old thread where I posted a photo and diagram of a radiant wall. I have never run a radiant wall at a high temperature so I do not know where the high limit is, but if you limit the fluid temperature to 140°F or lower you should be safe. Think of the sun on a dark painted wall in the summer. However, the paint does soften some when it is heated.

    The radiant wall in the photo heated a bedroom, approx 15 foot square if I remember right. It was a retrofit where there was no access beneath the floor and they were not replacing the flooring in that room. The owner did not like the look of panel radiators so we did this.

  • hot_rod
    hot_rod Member Posts: 22,120
    start with the room heat load

    once you calculate the amount of heat needed you could design the panel around the load. Several of the tubing manufacturers have deign info in their books.

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Aidan (UK)
    Aidan (UK) Member Posts: 290
    radiant walls

    We design radiant walls in showers and baths. The one picture labeled radiant-wall-w-foil is a basement wall - an area below grade with a relatively low heat loss. Would not recommend this in a relatively high heatloss area.

    You need to look at your heat loss numbers to assist in making the right design decisions. I prefer the plates myself, usually use the doubles.

    Good luck.
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