Thankyou for all of your help guys. Paul, I did say that the system would be converted to fully pumped, not left on gravity, sorry if I didn't make that clear enough.
Thanks once again, Lucy
Surely there are not very many primatics still around? The OP says his cylinder was replaced in the last year or so
Ok firstly we can only answer from our own exeriences and I can honestly say I have never seen an indirect (coil type cylinder) used on gravity hot water(you can but I never have). And as for having a primatic cylinder on a fully pumped system - well heres a link to what a primatic cylinder looks like inside.I was taking that it was a standard cylinder which is far more common than a primatic even on gravity,
BUT Gorepairs you can make a primatic fully pumped, before you answer do a little research
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