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Yes, drinking and hot water - only supply. I acknowledge your comment Dan regarding the source of the water and am grateful for confirmation that the vent flow would only be under fault conditions. Guess that's me into the worlds smallest loft space again!

Sorry, I should rephrase that. I can run the vent pipe internally towards the tank in the normal fashion. Instead of swan necking into the tank I felt it logical to keep the vent and drinking supply separate, hence take this out externally. Not to worry.

Terry, I have no reference point from the old system as much was removed in the damage post fire. Thinking about the quality of the cold water supply. It would not be a problem to run this to a high point on an external wall.

Thats very kind of you Dan, but there are also millions of houses who have drinking water supplies direct from the mains, hence why the vent pipe is not a problem in normal layouts. I understood that our tanked drinking water supply should be kept separate.

Evening all. A little advice if you can help me. We have a little cottage fed from a private water supply (well/spring). I use a lift pump to feed a coffin tank in the loft. The coffin tank then gravity feeds the hot and cold water system plus a central heating header tank in the usual way...