aj
head of marketing and bargains 
Posts: 541 
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Post by aj on Sept 16, 2019 16:45:46 GMT
a friend bought a house asked me to do a couple of diy bits for her. I noticed the central heating has been done in 15mm copper pipe for both the flow and return. and only a foot of 22mm pipe been used under boiler.The property is a through terraced house with 8 radiators on 4 floors. Its a combi sytem.Is this correct? Many thanks
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Post by endfeed on Sept 16, 2019 17:28:02 GMT
Might be a one pipe system, AJ,got any pics?
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aj
head of marketing and bargains
Posts: 541
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Post by aj on Sept 16, 2019 17:30:23 GMT
what does a one pipe sytem mean. It has a return
pipes under boiler are labelled flow, return, hot, cold and gas
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Deleted
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Post by Deleted on Sept 16, 2019 17:32:07 GMT
15mm will cope with about 3 rads
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Post by tomplum on Sept 16, 2019 17:42:12 GMT
I agree, 15mm is too small for that amount of rads,
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aj
head of marketing and bargains
Posts: 541
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Post by aj on Sept 16, 2019 17:54:42 GMT
what does that mean won't cope whatsoever of just take longer too heat up.
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Deleted
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Post by Deleted on Sept 16, 2019 17:57:37 GMT
what does that mean won't cope whatsoever of just take longer too heat up. It will never get up to temperature because the system does not have the right flow rate. |
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aj
head of marketing and bargains
Posts: 541
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Post by aj on Sept 16, 2019 18:09:38 GMT
so it needs replacing? 22mm pipe for main and tee off branch off in 15mm pipe
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Deleted
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Post by Deleted on Sept 16, 2019 18:14:27 GMT
so it needs replacing? 22mm pipe for main and tee off branch off in 15mm pipe Correct aj  if your friend is happy with it as is then I'd leave it alone. |
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Post by dickpuller on Sept 16, 2019 18:42:11 GMT
a friend bought a house asked me to do a couple of diy bits for her. I noticed the central heating has been done in 15mm copper pipe for both the flow and return. and only a foot of 22mm pipe been used under boiler.The property is a through terraced house with 8 radiators on 4 floors. Its a combi sytem.Is this correct? Many thanks The Heat Carrying capacity of a 15mm copper tube can vary. It really depends on several factors, the Flow temperature, the Head & the Delta T of the system. All of which will really determines its worth. Id ascertain these perimeters before passing judgement on it’s suitability👍👍👍 |
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Post by tomplum on Sept 16, 2019 20:27:44 GMT
the proof of the pudding is in the heating, I think with the temperature dropping rapidly towards Winter, she will feel the need to upgrade the pipes, Don't forget once the cold weather hits every plumber and his dog are bizzier than a one handed wall paperer on a bank holiday, So if you are thinking of upgrading, do it now,  |
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Post by DIYDafty on Sept 16, 2019 20:49:15 GMT
To ask a Daft question, how would you know its all 15mm? I mean if she's living there, wouldn't the floorboards be in place so you wouldn't get to see?
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Post by tomplum on Sept 16, 2019 20:55:03 GMT
AJ said in his opening post, " and only a foot of 22mm pipe" has been used under the boiler, It may well be in 22mm under the floor that AJ cannot see but, it will make little differance because the 15mm between is acting like a throttled down valve,  |
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Deleted
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Post by Deleted on Sept 16, 2019 20:57:57 GMT
To ask a Daft question, how would you know its all 15mm? I mean if she's living there, wouldn't the floorboards be in place so you wouldn't get to see? AJ said the flow and return from the boiler immediately reduce to 15mm from 22mm dafty |
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Deleted
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Post by Deleted on Sept 16, 2019 20:58:33 GMT
Snap Tom  |
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if your friend is happy with it as is then I'd leave it alone.
