Re: 10 mm pipe to 15mm pipe
the old pipe work could be 15mm or 22mm and just 10mm to the rads so you could use any size pipe but if its 10mm even under the floor then i would use 10mm all the way. but its up to you you have to join the pipes so you can put a reducer in to step up the pipes up to 15mm and stick with that for the new rad
hope this helps
uug
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