Water Pipes 15mm 22mm?

[Jimbo232]

Hi there, I have a terrace house with a combi boiler downstairs. Im refitting my bathroom. I have looked and seems like i have 15mm feeds both hot and cold coming from my boiler into my bathroom.

I want to install a mains powered shower. I have alot of 22mm and 15mm pushfit pipes and bits. I just dont know what to do for the best.

As a rule ive herd you use 22mm for hot and 15mm for cold?

If i run 22mm hot to my shower would there be any point when i have the hot in 15mm directly from the boiler, would there be any gain?

Any help would be great , cheers

 

[Al-Glasgow]

With your combi, I would say 15mm is fine to supply a shower.

A thermostatic mixer shower is best suited for combi's

Al

 

[bengasman]

22 is pointless, do the whole thing in 15

 

[PlumbGas]

22 is pointless, do the whole thing in 15

Totally agree do all in 15mm, no 22mm

 

[Whitespirit66]

Reading between the lines, you want to fit an electric shower. If you are set on one of these, then a 15mm cold feed is fine.

However, if your combi produces a reliable flow of hot water, then I recommend you forget electric and put a thermostatic bar mixer in, fed from your hot and cold.

I dislike electric showers, and unless you go for the most powerful (and expensive to run!), then the flow is often pathetic.

Then there's the high cost of fitting electric. A decent shower will be £200, plus the same again for an electrician to run a heavy cable from consumer unit, including switches and MCB.

Do yourself a favour

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