Has anyone here ever tried building a parallel flow pre-heater out of PVC pipe? N, more specifically, has anyone ever used one with any success?
And before you start (and I KNOW you will ), yes yes yes I know I should be making it out of copper. But I don't have any copper. I DO have about 50 feet of 3/4" PVC. It won't conduct heat nearly as well as any metal, but it's certainly not an insulator either.
My biggest concern is in the catastrophic failure department. I fear that the constant exposure to around 200 degree steam will cause warping, sagging, etc.
Thoughts? Experiences?