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I am using Warmly Yours infloor electric heating cables, as well as Mysa thermostats.

On the same 240v circuit, I have a bathroom (tile) and a kids bedroom (solid hardwood floor). Ohms we’re tested before, during and after installation (before final hookup of Mysa thermostat.) a circuit check was in place and never went off for either system. The two infloor electric heating systems, while on the same circuit back to my electric panel, are separate cables / thermisters / thermostats.

The Mysa thermostat reports that both are working just fine.

The tile bathroom one, however, you can feel the heat on your feet. That is comprised of the Warmly Yours cable in LevelQuick self-leveling, Hardybacker on that and then the tile. Works perfectly.

The hardwood however, which is the cable in self-leveling between furring strips, and then the hardwood directly on top of that. You just don’t really feel the heat in the wood there though, at all.

So the question is, would this be normal? Is wood just better at dispersing / spreading out the heat than tile?

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  • Just for fun. What is under the heater in the hardwood floor room
    – Traveler
    Jun 8, 2022 at 5:09
  • Had water pipes under wood to heat a floor - commercial setting and worked well. Design for the conditions, also water in pipes never exceeded 35 deg C.
    – Solar Mike
    Jun 8, 2022 at 6:18
  • @Ruskes 5 / 8" T&G OSB, and no insulation in the joists (both of these rooms are on the second floor.)
    – Nathan
    Jun 8, 2022 at 15:16
  • ideally a room's air and floor would be the same temp. if the floor is warmer, your room is losing heat somewhere. you also describe human factors of perception; a 50F evening is brisk, a 50F pond is deadly because water conducts heat so much better than air.
    – dandavis
    Jun 9, 2022 at 1:26
  • Someone should have told you that before spending money on installing heaters under hardwood floors.
    – Traveler
    Jun 9, 2022 at 1:29

3 Answers 3

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Tile will always be a better conductor of in floor heating than wood. The more important question is: "are both rooms getting to desired set-point?" If so, you don't have a problem.

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  • How do you know that ?
    – Traveler
    Jun 9, 2022 at 1:24
  • @Ruskes personal experience. Jun 9, 2022 at 4:00
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The floor feeling warm is actually a sign your room isn't well insulated:

The underfloor heating has to compensate for heat losses. These depend on the quality of your insulation. The worse your insulation is, the more your thermostat will have to crank up the power, and that makes the floor feel warmer. If your insulation is good, it will maintain the desired temperature while feeling barely warm.

If the underfloor heating manages to keep the temperature at the desired setpoint and the floor doesn't feel warm, it just means your insulation is good enough.

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  • Interesting. Both of these rooms are on a second floor. There is no insulation in the joists below them. The bedroom with wood flooring has two 2x6 exterior walls, the bathroom with tile has about 5 ½' of exterior 2x6 exterior wall, and then some fire & sound insulation in its walls. In general, this is a brand new home with impeccable insulation (think dozens of bottles of caulk, 2x6 walls fully insulated to R-23, R-38 in the ceiling.)
    – Nathan
    Jun 8, 2022 at 15:09
  • Yeah your good insulation explains it I guess. And perhaps the thermostat is set to a higher temperature in the bathroom too!
    – bobflux
    Jun 8, 2022 at 15:44
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Knowing the Thermal conductivity of materials:

Porcelain (tiles) 1.5 W/(m.K)

Oak wood 0.17 W/(m.K) (10 times less heat conductive)

Comparison to insulators (acting as heat barriers)

Fiberglass 0.048 W/(m.K)

Polyurethane foam 0.024 W/(m.K)

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