YES .......
Suburban water heater is GLASS_LINED.
LP will fire off and quickly heat up tank. T-stat will open when it senses 130*F on tank wall.
So far OK.......
Let it cool down naturally and odds are good for no damage.
Turning on water supply when tank is HOT......shattered glass-lining. NEW water heater.no replacement tanks for Suburban
Open outside compartment.
Pull the two wires on gas valve solenoids. (BROWN)
Or pull 12V DC main fuse for Water heater....in DC Dist Panel
OR valve out Propane.....it can't fire off