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Ok, just read a bit more about this and I should have known it would require a more indepth calculation for the gas i'll just let the fitter work it out and stop worrying........thanks!

Thanks mate.......im not doing it (no way!), I just like to know how things are meant to work and be sure the work is being carried out correctly. Gas wise the boiler will be running the usual sink in the batroom and kitchen as well as the shower and 7 radiators, the gas supply will literally...

Hi all, just a quickie (hopefully).......can anyone plse confirm what size pipe should run to the boiler for the gas and water? I think the actuall connections at the boiller are 15mm, the connection from the main water supply will run from a 22mm pipe which is within 2metres of the boiler...

Thanks Dave........ can anyone explain the different options I mentioned for powering the unit, which one should I be using out of the 230v wiring option and volt free etc and how would the wiring run from the sender/receiver unit to the boiler. Thanks again. John

Hi all, firstly i'd like to say what a great forum! I have been reading various boiler posts on here for the last month and you are all very helpful. This is my first post and i'm a newbie to boilers in that I have bought my first one, a Vaillant 831 ecoTEC combi for a my new 3 bed...