Replacing 15mm pipe with 22mm in gravity system

[SimonWestmoor]

I have a gravity fed hot water system (header tank in roof with hot water cylinder upstairs). The hot water system is plumbed with 22mm as far as the upstairs bathroom, but where it drops down into the kitchen downstairs it uses 15mm pipe.

The hot water flow rate in the kitchen is not particularly good, would there be any gain in re-plumbing with 22mm as far as the kitchen tap tail or would I just be wasting time and money for little gain?

 

[fixitflav]

I have a gravity fed hot water system (header tank in roof with hot water cylinder upstairs). The hot water system is plumbed with 22mm as far as the upstairs bathroom, but where it drops down into the kitchen downstairs it uses 15mm pipe.

The hot water flow rate in the kitchen is not particularly good, would there be any gain in re-plumbing with 22mm as far as the kitchen tap tail or would I just be wasting time and money for little gain?

My guess the latter. Mine is plumbed pretty much entirely in 15mm and reasonable flow. Are there any valves which might be stuck part open? Maybe worth trying a different tap.

 

[Exedon]

Is your kitchen tap suitable for low pressure?
Many kitchen taps particularly monoblocks are not.

 

[SimonWestmoor]

Yes, I suspect the tap is the root cause but that's the one she likes. Just wondering if replacing the final 15mm section so it's 22mm from cylinder to tap tail would make any appreciable difference.

 

[fixitflav]

Yes, I suspect the tap is the root cause but that's the one she likes. Just wondering if replacing the final 15mm section so it's 22mm from cylinder to tap tail would make any appreciable difference.

Unlikely. I think you need a different tap or a different "she"

 

[terryplumb]

No it won't make any difference.

 

[ianmcd]

if your kitchen taps are new and use flexi hoses that will be the problem

 

[SimonWestmoor]

OK, much as I thought - lump it or change the tap.

Thanks for the input everyone.