Hi. I'm having a combi boiler fitted in a house that has never had one, nor a Central heating system for that matter. Anyway a gas engineer is fitting the boiler and installing the central heating system, but I wanted to do the DHW. I'm not a plumber, just an enthusiastic Diy'er. So I would like to know if it is ok to use 15 mm pipe to all the hot water outlets, specifically the bath. Regards. M
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