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I am not reluctant to accept that if the pipe isn't adequate it needs replacing. My problem is I have had five quotes on this job. None of the people who quoted have measured the boiler's working pressure (the last one to be fair couldn't, the boiler is not working now). My problem is that I...

Sorry to get back to where I was, if the current boiler (combi) worked ok with the pipes as they are, and the new boiler has 15mm intake, being Vaillant, am I right to assume the current piping ought to be OK?

don't know if anyone ever measure the gas pressure with the boiler running. Having said that, the pipes were new 14 years ago, this was a new conversation when I bought it from a housing association, so I would guess they stuck to the regulations but spent not a penny more than they needed to...

so how come the combi I have had for 14 years has been ok? Is this because the new one is a condenser. Part of the pipe is 22mm but we don't know how much because it disappears under the floorboards. Have a gas hob but nothing else, no fires.

Well the current Potterton combi which has just expired at 14 years of age has been fine. It's about 8 m from the gas meter to the boiler. I don't know what model Vaillant he is thinking of, I will have to check. And btw BG are offering Bosch for rich people or Potterton for the rest of us.

Thanks, the guy is installing a Vaillant and he is saying that the boiler I need (1 bedroom flat) doesn't need the increased capacity that 22mm pipes would provide so from what you all say it looks ok. I'm female by the way, guys are born knowing stuff like this, I thought?

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...