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I'm getting my gas boiler replaced. The current intake pipes are 15mm. Distance of boiler from meter is about 8-10 metres. I'm getting conflicting info: British Gas salesman says all pipes must be 22mm because the intake on new condensing boilers is 22mm. Two of independent engineers say yes...

Hi, I'm looking to get my combi boiler replaced with a condensing boiler. The gas feed pipe looks to be 15mm wide, and I've been told by one person who quoted it must be replaced by 22mm pipe. The second person who quoted says it doesn't need replacing. So which is correct? While I don't want...