A simple cost effective radiant floor heating system
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ah, mephistophelis.
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Nice simple design, but how do you regulate water temperature going to the slab? And how do you dump excess heat in the summer? Thanks.
Good question, I thought someone might ask that.
In the current application, the design point is to prevent a garage from freezing. The water panel is sized for the location and climate so that overheating is never a problem, except for one or two months in the summer when no extra heat is desired. Even in the summer, the flow rate is such that the output is never hot to the touch. The system will thermosiphon and could have been built that way, but I prefer to have positive control over the flow to spread the heat out better around the slab and it doesn’t complicate the system much. The El Sid electronic driver has no moving parts except a magnetically coupled pump impeller.
In the two months of summer when no additional heating is desirable, I cover the hot water panel and the system just recirculates the water with the hot water panel now acting more like a radiator to dissipate slab heat. In the future I may use that summer heat for some other purpose.
PS. This panel is also mounted vertically on a south facing wall, so it provides more power at the lower sun angles of spring fall and winter.
I love the simplicity of this design.