Will 15mm do...?

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Thanks to a dripping manifold which has spurred me into action, I am finally getting around to replacing my 8mm microbore with some decent sized copper pipe. The manifold is fed by 22mm both flow and return and I was planning on teeing into the flow with more 22mm up the hall towards the radiators (about 3m away) before reducing to 15mm. Will I need to return the same distance with 22mm or will 15mm back to the 22mm be ok?
 
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3m won't make a lot of difference!
15mm pipe will supply about 4kW from a non condensing (ie older ) boiler.
 
Thanks Chris,

The boiler is a Baxi 105, does that make any difference?

I was just concerned about restricting the flow of water back to the boiler, or does it not make that much difference?
 

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