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It is basically a 22mm gas pipe which reduced to a 15mm pipe just before it enters the boiler and cooker.

You can see in the picture that the 22mm is reduced to 15mm going into the boiler, so do I only need to replace the small bit of 15mm to a 22mm? Basically a 22mm gas pipe goes to the boiler and has t junction, which has 30cm of 15mm pipe going into boiler and the other 15mm going to the...

I have upload a picture you can see that the 22mm is reduced to 15mm going into the boiler.

So basically the 30cm of 15mm going into the old boiler will have to be replaced? The rest of the pipe is 22mm. I will upload a photo soon.

Basically I have main combi 24kw and I am replacing it with a baxi duo tec 24 kW. The gas pipe is 22mm and the last 30cm of it going into the boiler is reduced to a 15mm, and my plumber said it needs to be replaced to a 22mm, why would he say this when the pipe is 22mm and only a bit of it is 15mm?

Basically I a 22mm gas pipe running from the mains all the way through to the boiler, however when the gas pipe goes to into the boiler it is reduced from a 22mm to a 15mm? (about 30cm of 15mm pipes goes into the boiler) My question is why would a 22mm gas pipe be reduced to a 15mm going into...