15/22mm cold feed to boiler

[Matt0029]

I'm in a house with the cold feed coming up in the kitchen. In 25mm mdpe. The boiler is in the garage adjacent. I plan on running the cold from the sink in the kitchen under the kitchen units to the garage to feed to boiler. And the 15mm coming back from the boiler to the sink. Would there be an advantage of taking the cold in 22mm to the garage to where is splits to feed the boiler/ the rest of the house?

 

[ShaunCorbs]

Less pressure loss if multiple outlets are opened

 

[Matt0029]

So it would be worth while doing? Would mean swapping the stop tap from a 25/15 mdpe to a 25/22 one.

 

[Matt0029]

Would then reduce down from 22 to 15. On likely on a 22/15/15 tee as it feeds the pipe would split to feed the boiler then the rest of the house.

 

[Matt0029]

The kitchen sink and washing machine getting feed before the pipe goes to the boiler but that would be all. Then a bathroom to feed, 2 ensuites and a cloak room.

 

[Matt0029]

Yes maybe should have more then a combi installed but that's the spec.

 

[fowlerboi]

If you have a 25mm main you're laughing really. Run 22mm from the stopcock, then tee off in 15 from the 22 to the sink, another to the shower/bath, another to the toilets/basin and then 15mm to the boiler. It will be massively overkill but it will help prevent reduction in flow when showering and something else consumes water too

 

[Matt0029]

25mm main I need to tee of to the sink yes. Then it's one pipe under the kitchen plyth that goes to feed the boiler in the garages and then after teeing off to the boiler feeds the rest of the house.

 

[Matt0029]

Would it be better to run this pipe in to the garage in 22mm instead of 15mm