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View the thread, titled "speed fit on secondary return" which is posted in UK Plumbers Forums on UK Plumbers Forums.
Like in my mums house 🙂
Higher pressure in invented ? CH water isolated from mains ? If secondary return leaks its constant leak ?
V
vern
I work in loads Simon, and yes they are on a lot, but not 24 hours everyday, maybe the fresh water has an effect too, all I know is what I have seen, not good....
M
Masood
Well... No problems until one occurs! Not suggesting that there will be a problem, of course, but if one does, no manufacturer will honour the warranty, and your insurance will be void. It's like any regulation or precaution - it's not there to cover the 99.999% of situations where nothing goes wrong, but the 0.001% of the time when something does...
You make your choice and take the consequences - you're a braver man than me!
V
vern
Aww maybe I am wrong then, and the manufactures are too, hence why they dont endorse it for this application, must have been the ammonia essence that caused multiple pipe failures......the returns do have to be on 24 hrs a day for this to occur.
I don't hate plastic pipes, indeed it has it merits in some circumstances, but copper all day long for Vern!
V
vern
100% agree...very rare but seen it happen!
If the manufactures say 'No' then surely no it is?
But a properly soldered joint?
Clearly you have never been in or worked in a nursing or old peoples home, heating and hot water 24/7 365 🙂
V
vern
Because you can't on hot water due to legionaries, nursing homes are under intense regulation! As are other commercial applications......
M
Masood
No mate, they don't. The manufacturers say their product must not be used for secondary returns. No mention of hours per day or anything else. Simply no. It's in black and white on their websites. You can choose to ignore it, but pretending that they allow it under certain circumstances is just wishful thinking.
Technically plasticiser will leach out of system where water is always changing ,hence more brittle (less spring back to keep things sealed)
Sealed circuit (ie-Boiler) , plasticiser cannot escape gets re-circulated
( PURE Theory no experiece with plastic plumbing--)
Loss of plasticiser and enbrittlement == fact
Trade offs a) How hot
b) How much water thru system
c) How many years of life
d) How many hours a day pump runs
e) Price of install
Life whole system needs to last -vs- water thru system for effect to happen
Copper rules !
Sealed circuit (ie-Boiler) , plasticiser cannot escape gets re-circulated
( PURE Theory no experiece with plastic plumbing--)
Loss of plasticiser and enbrittlement == fact
Trade offs a) How hot
b) How much water thru system
c) How many years of life
d) How many hours a day pump runs
e) Price of install
Life whole system needs to last -vs- water thru system for effect to happen
Copper rules !
load of ole twaddle I bet you don"t even understand half of what you just posted
Think your theory is wrong, seen plastic that has been used for dhw that is 25 years old and is still ok, not brittle at all
But did that water keep getting mixed/re-circulated with 210 litres of fresh water ,ready to soak up more plasticiser ?
( only needs to happen to softer seals to be a problem )
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may not have seen effects of plasticiser in pipes ,but seen it leach out of cables and damage painted surfaces -within a year-
Insulation on cable is PVC and should not be painted with gloss and is not the same material as plastic pipe 🙂
Has water running through it every time tap is turned....you been on the pop ? 🙂
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