On a slab, if you don't have insulation under your slab and it is not dry (especially if there is any water flow), the efficiency of heating the slab will be poor. You can take the chill off, but you may not want to use it as the primary heat source. Putting carpet over top probably won't help. With a large mass, response tends to be slow. If the area floods, I'm not sure I'd want either in-floor electric or electric baseboard. You can get a lot denser heat transfer with hydronics. See what the others think...





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