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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> 15mm into 22mm Pipe Pressure https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1487350570 Message started by Gammy_leg on Feb 17^th, 2017, 4:56pm

Title: 15mm into 22mm Pipe Pressure
Post by Gammy_leg on Feb 17^th, 2017, 4:56pm

Hii,

Probably a stupid question but...

The hot water feed from my new combi boiler is 15mm and has 15mm copper pipe attached. If I were to connect up 22mm pipe further along the pipe run and take this up to the bath tap would the flow rate be higher than if it was 15mm all through?

Thanks

Gammy

Title: Re: 15mm into 22mm Pipe Pressure
Post by Headrush on Feb 19^th, 2017, 8:01pm

It's highly unlikely..

Title: Re: 15mm into 22mm Pipe Pressure
Post by thescruff on Mar 17^th, 2017, 10:47am

No, it wouldn't and in any case the boiler can only produce a limited flow rate of hot water.

At best you'll have a cold bath unless you restrict the flow