Attached is a photo of the collapsed outflow pipe from my heater.
Not sure why this happened. The thermostat seems to be working fine and the pipe is only slightly warm on the outside to the touch.
Needless to say this has diminished my GPM. Dropped it from about 85 to 70.
Anyone with heater experience have any ideas, comments. The pipe is PVC SCH 40, not CPVC which I understand is what should be here.
Unless I can find some problem with the heater, I plan to simply replace the 3 ft section of pipe with CPVC.