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    Peterk84's Avatar
    Peterk84 Posts: 4, Reputation: 1
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    #1

    Apr 20, 2014, 12:42 PM
    Can I tee from 15mm to 22mm to feed a bath?
    I have a shower that wants replacing with a bath. It's in a conversion and everything is in 15mm. The closest I can run the 22mm from is 3/5m from the boiler then it'll be a run of 12/15m in 22mm to the bath. Can I supply the bath with 22mm? If so where's best to start?
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
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    #2

    Apr 20, 2014, 01:06 PM
    Is sounds to me like you have a 1/2" feed and a 3/4" opening in your bathtub valve. Unless the manufacturer specifies a dedicated 3/4" feed you will be just fine if you put a brass 3/4 X 1/2" reducing bushing in the valve. Good luck, Tom
    Peterk84's Avatar
    Peterk84 Posts: 4, Reputation: 1
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    #3

    Apr 20, 2014, 01:10 PM
    Quote Originally Posted by speedball1 View Post
    Is sounds to me like you have a 1/2" feed and a 3/4" opening in your bathtub valve. Unless the manufacturer specifies a dedicated 3/4" feed you will be just fine if you put a brass 3/4 X 1/2" reducing bushing in the valve. Good luck, Tom
    Sorry I didn't say the bath would be a new installation. I've only got 15mm pipe to the bathroom. Can I run 22mm off the 15mm to feed the bath?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #4

    Apr 20, 2014, 01:11 PM
    Yes. The water will flow fine.
    Peterk84's Avatar
    Peterk84 Posts: 4, Reputation: 1
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    #5

    Apr 20, 2014, 01:16 PM
    Quote Originally Posted by ma0641 View Post
    Yes. The water will flow fine.
    Excellent. Is it better to run the 22mm from as close to the combi boiler as possible? Hot and cold?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #6

    Apr 20, 2014, 01:45 PM
    Really doesn't make that much difference. The flow limitation is in the 15mm. There is more volume in the 22 but you will not see any difference.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
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    #7

    Apr 21, 2014, 05:53 AM
    Can I run 22mm off the 15mm to feed the bath?
    Yes you can but itg won't change the pressure or the volume. Why do you want to do this? Back to you. Tom
    Peterk84's Avatar
    Peterk84 Posts: 4, Reputation: 1
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    #8

    Apr 22, 2014, 09:44 AM
    Quote Originally Posted by speedball1 View Post
    Yes you can but itg won't change the pressure or the volume. Why do you want to do this? Back to you.
    In my bungalow there's a wet room designed for disabled use. I want to fit a bath where the shower is, there is only 15mm feeding the wet room. I want to make sure there isn't extra strain on the boiler. Also I'd like to know if it makes a difference going from 15 to 22.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #9

    Apr 22, 2014, 11:01 AM
    No difference, it was plumbed with 15 originally and gave no problems.
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