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thanks for the replies. There is only one boiler. The original was on the 1 st floor. The new on the ground . Each green line is a feed and return. Thanks for the confirmation of what I suspected. It is sort of working. Some radiators take up to 30 minutes to get warm. My old boiler only 2:3...

Please can someone help. I am looking for some guidance on a new boiler I have had installed. Originally I had a conventional open vented boiler on the first floor of the property and the feed and return went straight into 22mm pipe under the first floor floor. From that it branched off to 15mm...