CPVC Pipe for Geothermal
This is a cross-post from HVAC.
I have a 5 year old geothermal system. Slinkly loops outside are made with HDPE but interior plumbing is CPVC. Anti-freeze is a water-methanol mix (about 10% methanol). The static pressure is about 20 psi and when running about 35 psi.
I just repaired a small leak at the manifold where there was a 2" to 1 1/4 reducer bushing - looked like a bad gluing job.
I decided to look on line and was surprised to see an article that said to never use CPVC pipe for any geothermal application. I also read a few articles about schools that had used PVC (Schedule 80) for their inside plumbing and they had leaks - and replaced all their pipes.
Am I sitting on a time bomb? What would cause the CPVC to fail?