OP has a Suburban with a FIXED temp t-stat (130*F +/-)
If your is heating to 180*F (which I doubt) then it must be either an Atwood using a Mixing Valve with a factory FIXED t-stat of 160*F and Mixing Valve controls output to 130*F
OR yur normal T-stat has failed and the High Temp T-stat is controlling but it should trip all heating cycles when it opens and have to be reset for any further heating
Suburban...High Temp T-stat FIXED at 170*F and has MANUAL Reset
Atwood.....ECO (Energy Cut OFF/High Temp) FIXED at 180*F and tirggers Red FAULT Light/has to be Reset after temp drops below 150*F
Atwood EXT models do heat to higher nominal temp so that a 6 gal TANK will provide the equivilent of 9 gals of 130*F water and 10 gal tank provides equivilent 16 gals of 130*F water.
(water heated to higher temp in tank then output controlled by mixing valve)
So what model of Water Heater and how are you measuring 180*F water temp????
It isn't like the OPs.....apples to oranges
MOD'S EDIT: Deleted quote from deleted ignorant political post.
