M
MURRAY
Hello. Last month I had a plumber install my underfloor heating system but it failed when he tried it (the base of the hot water cylinder popped out). He has not returned and I wander if anyone could explain where the problem might stem from. Basically I have a copper hot water cylinder, heating water via immersion (free electric due to wind turbine, with automatic shut off when not operating). Water goes from here to A Myson UFH thermomixing valve to circulating pump (Grundfos25 60 130 setting 3) to manifold and into heating loops (120m total length) then returns to manifold and back to mixing valve. The cool water goes towards a circulating pump (Grundfos 15 50 130 setting 1) before returning to the cylinder. A pressure vessel is located above the cylinder. The system was filled with cold water initially with the tap then closed to create a closed system. Is there an obvious flaw in the plumbing here? Is there a need for the return circulating pump between the mixing valve and the cylinder. After the cylinder popped the plumber indicated that a small water tank above the cylinder may be more appropriate than the pressure vessel!! Any help much appreciated
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