Two completely different sets of T-stats...but both are pre-set the same
One 120V AC set (normal and ECO) for electric element
One 12V DC set (normal and ECO) for propane
Both normals are pre-set for 130F (turn off temp) and both ECO (high temp) are pre-set for 170*F (turn off temp)
You can get a lower pre-set......120*F
Or a higher pre-set.....140*F
Higher pre-set for electric.......both propane/electric would come on. Propane would shutoff at 130*F and electric would continue operating until 140*F
DISCLAIMER:
Not sure of temp that t-stats close at. (Typically 30*F spread from close to open)
If the same open/close range for t-stats then the higher pre-set t-stat would close 10*F before the other and open 10*F higher than other.
Soooo propane may not come on at all when using electric & propane with different temp t-stats due to the same open/close range?????
Probably easier to run both until water is heated then turn propane off and let electric maintain. Then kick propane back on for fast recovery.....if needed.
We use electric only when we have AC power and save the propane for when we don't have AC power
