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Post by clart on Sept 4, 2018 17:28:04 GMT
So I found out today that you shouldn't use plastic pipe on domestic hot water with a secondary return. How can this be if you can use plastic on heating circs?
(Barrier pipe of course.)
Thoughts please ladies and gents...
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Post by battle1066 on Sept 4, 2018 18:45:30 GMT
I was told "Most plastic pipe is not rated for secondary returns, (and most manufacturers specify this in their small print)
Secondary return is very different as it must withstand hot water for a much longer period of time than a boiler circuit; potentially 24/7"!
So basically to give unrealistic life time warranties the manufacture reduce the time it's stressed for at temperature as a get out clause!
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Post by tomplum on Sept 4, 2018 19:00:20 GMT
yep, battle is correct, this first happened on a 'acorn' installation, Acorn was the first major plastic pipe manufacturer, So when this was found to happen, they closed, reformed as Hep20 and made new instructions about secondery return systems,  |
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