This is the second time in the past year I have needed to replace the thermal regulator (thermostat) in my Sta Rite MaxETherm.
This is used on a ~1200 gal. saltwater in ground spa.
This one is 6 months old. They have rarely lasted past 1 year.
Here's the one I just pulled. You can see the crack in the center shaft and it is completely frozen.
I thought I kept very close eye on my water chemistries but clearly there is something not right. Is there a specific thing like ph or hardness that might be accelerating this problem? Can anyone offer any advice on how to get these things to last longer or can I just leave it out. It's become a bit of a PITA.
The heater works well without it right now- no error codes!!!