What size should the pipes be that feed a bath?

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

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

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

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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