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Thanks a lot! The boiler works fine and the engineers did all the checks. It's just that in the installation instructions manual the gas inlet is marked 22mm and today I saw that pipe is actually 15mm so worried myself a bit.

Thanks very much for your reply! The boiler requires 22mm gas connection is because of the higher pressure demand, isn't it? Will the last 5cm of 15mm pipe affect the pressure somehow?

Hi, this is my first post here. Any input would be very much appreciated. We had a ecoTEC 837 installed recently. Today when I looked at the pipeworks in the bottom of the boiler I noticed that the gas connection which goes into the boiler has been reduced from 22mm to 15mm for the last 5cm...