Originally Posted by ronbo1
A bad head gasket would be a possible cause but in this case it wasn't. There were no bubbles in the tank and head gaskets don't mend themselves. The tank remains 1/2 filled months later.
From my automotive background, I would have first thought headgasket myself, I would likely have never considered the water heater, I'll have to try to remember this as I would have been pulling my hair out and would likely have thought great, I have a cracked head when the gasket didn't fix it.
Why do we call them hot water heaters, when they are actually cold water heaters ?