Checked TStat this AM. No movement toward tank when pushed with finger. Both it and the ECO next to it seemed tight. Did a continuity test and it showed a dead short, water at about 50F. Pulled and cleaned all elect connections outside on WH.
Started it up on gas. An hour later it had turned off. The water tested at 150F at the kit sink. A continuity test of the TStat showed circuit open. Which is correct for burner off condition.
Cycled the WH 3 times by running hot water until WH came back on. Turned off each time at 140-150F.
Looks like I was mistaken. Like many have said in other posts here, this Atwood WH has a preset thermostat that is very hot. I think the TStat is set for 150F, the Emergency Cutoff Off about 180F, and the T&P Relief Valve about 210F
You basically just need to get used to it.
2004 Dodge Ram 5.9L Cummins HO, Auto QC 4WD SRW LWB....2004 HitchHiker II LS, 30.5 RLBG, Dbl Slide....2005 Sandpiper Sport 19ft T21 toyhauler