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Just being nosey I don't know much, last time I looked in to it the idea of underfloor heating was looking at heat pump to heat the water to run underfloor heating but that was for a possible self build. Doing that to an older house would need an increase in insulation. When I looked at the electric ones the running costs were higher but initial out lay cost lower, then was the idea of adding solar cells on the roof to offset the cost.
What kind of under floor heating? Electric or water?