Solar pv as primary heat source for the thermal store. Oil boiler twinned up with this as a backup up ( less efficient) system. 200 meters underfloor heating to be dropped in here , we’ve prepped floor / damp proof / concrete sub floor to go in a lot with kingspan insulation and screed. This is on new building regs with 350 mm cavity’s , super efficient air gap with kingspan barrier in walls.
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