Secondary return

[Johnyc86]

Hi
Just wondering can anyone tell me why a secondary return can not be plumbed with plastic pipe like pex or pb

 

[Ben-gee]

Use climaflex 22-25, stops things freezing but not convinced it does much more. I’ll try to get armaflex, Chuck a load of loft insulation over it for time being.

 

[ShaunCorbs]

If you want to go all out use the rockwool insulation (silver foil on the external)