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Slugster
Senior Member
Joined: 24 Feb 2007
Posts: 965
Location: Cotswolds
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 Posted: Sun Sep 14, 2008 11:49 am Post subject: Any advantage in going up to 22mm from 15mm? |
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The mains supply to my house is 15mm (that's what comes up throught the floor)
It's then 15mm to the Combi boiler, 15mm out of the boiler to the taps (the CH is 22mm)
I've just lifted the boards in the bathroom and found for the last few feet, the hot water pipe goes up to 22mm with 15mm tees for the taps etc
Is there a reason for this or was a previous plumber just taking a shortcut and not replacing some old 22mm pipe.
To me there isn't an advantage to having 22mm pipe if there is 15mm in the previous supply as the 15mm will cause the bottleneck.
But that's why I'm asking. I'm perfectly happy to increase the pipe work to 22mm if there is a benefit.
The order of the pipes will be...
Supply to bathroom.
Tee for the bath taps and shower (this supply will go to the shower and the bath taps will tee of this)
Bit more pipe and then tees for the basin
And fianally going to the WC
I'll get a diagram done
Any thoughts???
Cheers
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Slugster
Senior Member
Joined: 24 Feb 2007
Posts: 965
Location: Cotswolds
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5720
Location: Bath
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| Posted: Sun Sep 14, 2008 12:11 pm Post subject: |
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Keep it all 15mm.
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Scruff |
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Stoday
Electricity economics consultant
Joined: 20 Jan 2006
Posts: 3228
Location: Sitting on the Bog
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| Posted: Sun Sep 14, 2008 2:32 pm Post subject: |
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Scruff's right, keep it to 15mm.
If you increase the hot water to 22mm, you'll double the water in the dead leg. That means you'll have to run off twice as much as you do now before the water runs hot.
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Steve the Gas
Senior Member
Joined: 30 May 2008
Posts: 799
Location: Notts/Derbys
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| Posted: Sun Sep 14, 2008 3:03 pm Post subject: |
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I'm with those two 
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Slugster
Senior Member
Joined: 24 Feb 2007
Posts: 965
Location: Cotswolds
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| Posted: Sun Sep 14, 2008 3:19 pm Post subject: |
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Thanks guys
If it was 22mm the rest of the way I would keep it that way to the shower and tee of with 15mm for the taps.
But with the 15mm restriction already in place, what's the point.
Cheers
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5720
Location: Bath
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| Posted: Sun Sep 14, 2008 3:29 pm Post subject: |
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Use as much 15mm as possible
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Scruff |
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