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Thank you all for responding, this makes sense now, i do like the idea of connecting the expansion tank feed & vent line between the boiler and pump but unfortunately this would involve a lot of work due to the distance between expansion tank and boiler, I think in the short term a bypass with a...

Hi Mr W Thanks for responding, I do have a picture of pipe work to HWC but it’s of the old cylinder it does include the vent line from the HWC and fill line from expansion tank, it’s pretty much the same now but with a few more elbows i have also included picture of boiler pipe work. This...

expansion tank overflowing

Hi here i have seen several posting here for similar subject My hot water cylinder split a few weeks ago, thankfully it was only a drip, however i decided this would be a good time to upgrade the system, i have a mistral oil fired boiler and a open vented C/H system, there has never been any...