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Plastic or copper


 
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camerart

from United Kingdom

Joined: 19 Nov 2008
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Location: Dorset,
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PostPosted: Mon Apr 02, 2012 8:44 am Reply with quote

I'm replacing old galvanised hot water pipe because it takes a long time to get hot water at the taps. Also for central heating.

I'm thinking about fitting plastic and wonder if plastic or copper is best for moving hot water?

In case of the Kitchen, which is downstairs and the hot tank is upstairs on the landing, is 15mm ok.
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Zulley

from United Kingdom

Joined: 05 Apr 2012
Posts: 12
Location: Nottinghamshire,
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PostPosted: Thu Apr 05, 2012 4:59 pm Reply with quote

Ive just done all the new plumbing on my house.

Ive used plastic pipe and push fit fittings for all of the water going to taps, although, copper pipe coming from the boiler to fit to the plastic pipes.

You have to use copper pipe for the central heating system - radiators.

15mm is used for everything, my dad told me to use 22mm for the hot water to the bath (quicker to fill) but i havent done so god knows if thats right or wrong.
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camerart

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PostPosted: Thu Apr 05, 2012 6:13 pm Reply with quote

Thanks for your reply Zulley,

I asked lots of people, who gave me arguments for both. I bought all copper pipe yesterday, and fitted a radiator today.

I think 22mm is used for the bath, because when they are both on the same floor, and there's a lot of water needed to fill it, so a better flow is advisable.

I was going to put a parallel 15mm for hot water to bathroom Basin and Kitchen sink, so they heat up quicker, but was advised to tap off from the 22mm, and insulate them even though they are mostly under the landing floor.

Cheers. Camerart.
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yerino

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PostPosted: Thu Apr 05, 2012 6:38 pm Reply with quote

Central heating CAN be used in plastic if you wish to do it that way.

To be honest it doesn't matter if you use copper or plastic it's not going to make a difference to the flow.

22mm pipework is always advisable to hot water outlets on an vented system.

With regard to central heating the flow and returns should always be ran in 22mm pipework then teeing of in 15mm to feed each radiator.
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camerart

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PostPosted: Thu Apr 05, 2012 8:40 pm Reply with quote

Thanks Yerino,

I finished the central heating part, just moved one radiator, in 15mm copper.

As for the hot water, you have help to make my mind up. The problem I have is the hot water to the kitchen is quite a long way, and takes a long time to get hot. So I'm going to 'T' off the existing 22mm in the 1st floor bathroom. 22mm to the bath, 15 to the basin, then carry on down to floor level kitchen sink in 15mm, which because of the height, I think this should flow ok
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xr4x4

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PostPosted: Thu Apr 05, 2012 8:46 pm Reply with quote

But remember, with 22mm pipe, there's twice as much cold water in the pipe to shift before the hot gets to the outlet.
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camerart

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PostPosted: Thu Apr 05, 2012 9:07 pm Reply with quote

xr4x4 wrote:
But remember, with 22mm pipe, there's twice as much cold water in the pipe to shift before the hot gets to the outlet.


I was going to put in a separate 15mm just for Basin and sink, for your reason, but was advised against it. And there's a tempting old electrical conduit, which if I removed it, would take a 15mm pipe without too much effort.

Thanks.
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