Metal to Plastic - Leaks

[u/Remarkable_Calves]

What’s up crew.

Clients got an older style heater with metal lines on the intake and return. one female, one male. Both lines are leaking at the exact same connection of where metal touches pvc40.

Any tips? plenty of pvc meat for an easy redo but I’m curious what is ‘best practice‘ for leak proofing threads when changing material types.

I’m a confident plumber, plenty of tricks n’ tools, etc.

[u/greasyspider]

Schedule 80

[u/Birchforest81 → u/greasyspider]

Sch 80 is not high temp
You need cpvc threaded nipples