quick question re central heating in loft extension

24 Nov 2008
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United Kingdom
A new loft extension is to be built. Combi boiler on ground floor. 1st floor has 22mm pipes teeing off to 15mm for radiators.

At least 16ft of pipework needs to be teed off from 22mm pipes on first floor to supply radiator(s) in new loft extension.

Should this be 22mm or 15mm?

Thank you.
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