speed fit on secondary return

[dancinplumba]

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 !

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

 

[zzzjim]

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 )

 

[zzzjim]

don"t even understand half of what you just posted

may not have seen effects of plasticiser in pipes ,but seen it leach out of cables and damage painted surfaces -within a year-

 

[dancinplumba]

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

 

[dancinplumba]

But did that water keep getting mixed/re-circulated with 210 litres of fresh water ,ready to soak up more plasticiser ?

Has water running through it every time tap is turned....you been on the pop ?

 

[markfxy]

been on wikipedia more like!

 

[zzzjim]

Has water running through it every time tap is turned....you been on the pop ?

The total no. of litres flow at final outlet ,must be nothing compared with continuous replenish hot with hot that happens within pumped secondary return , that stays hot so boosts leaching effect

( any YES Cider )

 

[lame plumber]

personally if the manufacturers say dont use it, I wouldnt, as come the day it fails, you are in the pooh as the installer who has to defend your actions.

 

[zzzjim]

been on wikipedia more like!

They did'nt call me Magnus at school for nowt !

 

[dancinplumba]

The total no. of litres flow at final outlet ,must be nothing compared with continuous replenish hot with hot that happens within pumped secondary return , that stays hot so boosts leaching effect

( any YES Cider )

If it leeched into water it would be banned