Originally Posted by nate7vball
I let it run for an hour. I read something about a bypass could be on that lets cold water into warm line??? You would think if that was happening water would be Luke warm not cold. My only thought is that thermostat is bad and shutting flame off before water is really heated, but even then i would think water would be somewhat warm and its just not....its freezing cold.
You said you let it run for an hour, can you hear it?
There is a bypass valve, that will NOT let any hot water through, in other words when you open your hot water facet, it will be cold..
If you water heater is actually heating the water, then it would be a bypass valve, usually located on the back side of the water heater, access is usually through a cabinet or drawer, mine I have to take the drawer out from under the stove, and the valve is right there.
I believe from what you are saying that the water heater is on.
While your in there checking the bypass valve, reach down and try to feel the water heater, it should be warm.