There appears to be a recall on that heater. The poppet valve fails. I’m not fully up on this but that would be a cause for that kind of problem.
https://static.nhtsa.gov/odi/rcl/201...5V751-3571.pdf
BUT, I have a 2017 Adventurer and it came with a completely different water heater and other Adventurers from many other model years also have the same as mine.
Are you sure it came from the factory with that heater? Could a previous owner have installed it?
The standard water heater is an Atwood 10 gal, gas/electric tank water heater with a Motorad feature that also heats the water tank with radiator fluid from the engine when driving.