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thanks for all the replies - seems its feasible - just need to work out this expansion / vent business. How should it be done ? Whats the correct method ?

I think the easiest way would be to have the expansion as you suggest. Can it go out the roof and up the soil pipe to get the height ?!!

Should it terminate outside of the house then ? How are they normally discharged ? Onto a roof or something.... Thanks for the help.

Thanks for the reply Ian. I understand about frost protection etc so would insulate accordingly and make sure all pipework is suitably buried. I wasn't aware the HW expansion tank had to be higher than the CW tank. This is going to be difficult as there is nowhere in the house above the new...

Hi all - first post, so please be gentle ! I live in a rural cottage with a private water supply via a borehole and a pressure vessel. There is not room for a cold water tank in the house as the bedrooms are in the roof space. We have a fortic type tank upstairs which provides enough...