Changing 15mm pipe to 10mm

[markymark1234567]

Hi everyone, Just joined tonight.
My central heating system is piped up in 15mm pipe.In the front room and passage I have the 2x 15mm pipes running down the wall in ugly trunking. Now i'm getting both rooms plastered and I am thinking about chasing the wall and running 10mm pipes in the wall and plastering over.
I will need to put 15mm to 10mm connectors in the wall now will this be ok and will the radiators still get hot in 10mm.
Many thanks in advance.

 

[mickyg]

yep thats fine.

 

[markymark1234567]

Can i also still tee off the 15mm to 10mm and add an extra radiator with no affect?
I have a worcester 24cdi combi, Cheers

 

[mickyg]

depends on the size of the rads. The maximum heat carrying capacity of 10mm tube is around 4kw but thats assuming suitable flow rates and best case scenario. In your average domestic situation I'd take a bit off that say 2-3kw max from any single 10mm feed.