Central Heating Pipework Branches

[Christian and Beccy]

Our Central Heating circuit is 22mm pipe (feed and return), with the branches from the circuit to each rad, and back again, in 15mm pipe. Obviously, these branches vary in length but are mostly under 500mm. Having just added an extension, things would be much simpler if I don't have to bury 22mm pipe in the screed, but by doing so, 2 of my rads will be around 1.5-2.0m from the main heating circuit. Is it acceptable to pipe these branches in 15mm at this length?

Thanks.

 

[denso13]

Yes should be ok, 2m of 15mm from the 22mm cuircit isn't far at all.