What size should the pipes be that feed a bath?

Can someone let me know what size the copper pipes need to be to feed a bath, hot and cold.

cheers

 

22mm is the common size for a bath.

 

this will be both hot and cold.

are 22mm isolation valves available?

 

you let us know if its gravity or mains pressure hot/cold

 

yes.

 

oops sorry, it fed via a combi boiler

 

Does it really matter? 22mm is better, more flow than 15mm. 15mm for combi, 22mm for unvented storage.

 

so is it 15mm or 22 mm for combi?

 

15mm for combi as hot outlet is 15mm. If you renew bath you can reuse 22mm. 15mm or 22mm, no problem.

22mm for tank fed water.
15mm for combi.
22mm for unvented storage.

Dan

 

cheers guys, its a bath renewal, currently on 22mm.

 

you've just answered your own question

22 gravity
15 combi etc

if it's 22mm leave it.
i asked as it could of been a total new install and alot of mains pressure bath taps are 1/2" now not 3/4" so no need for 22mm pipe.

 

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