Upstairs 672ft2 is heated by Pex suspended under the 3/4” Advantech subfloor.
This heat transfer from the Pex via convection & some radiation to the subfloor is less efficient than conduction in a slab & the water temperature needs to be about 40*F hotter (no good for solar or a heat pump)
Most is spaced at 4” on Center and is 2” to 6” below subfloor and works mostly by convection.
Last edited by buffalobillpatrick; 01-02-18 at 06:46 PM..
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