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twgas, it was gravity hot water, pumped central heating, so there were no valves there originally

onlyfitidealboilers, In the promax range the only one which there is mention of 28mm flow and return is the 30kw, the 24kw is fine with 22mm. The Worcester 30CDI regular boiler, another one I was looking at for this job, is 22m flow and return, so back to the original point, without referring...

Thanks to both of you. xr4x4, the promax has 22mm connections although it does say in the MI that the 30Kw "should" have 28mm flow and return by means of a reducer. However, I'm looking for any possible adverse effects of first couple of meters of the flow and return being 22mm? is it really...

Hi, I'm replacing an ideal Mexico with a Potterton Promax SL (30Kw). The original heating pipework is 28mm from the boiler. I'm upgrading the system, so fitting a 3 port valve and also a magnaclean. Space is fairly tight and the pipework needs a fair bit of rerouting, so I was going to do...