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10mm to 15mm when adding 2 rads?

i have 10mm pipe to my rads is it ok to branch off a rad to add a couple of conservatiry radiators increasing to 15mm pipe or is it best to stay with 10mm
bucko, October 2008
Generally not a problem, I do it all the time, unless the extensions are significant that the water volume would exceed the boiler spec, nope, go ahead.

scott, October 2008
the 10mm will come from 15 or 22mm pipe further back towards the boiler you will have to tee off there

stevie w, October 2008
if you plan on running the two rads off your existing heating system you'll need to fit a seperate wall stat and zone valve as it must be controlled seperate to the existing heating if you don't you are breaking building regulations.

sonray heating, October 2008