Originally Posted by cthomas
All valves are correct. .
You would be surprised how many times that this is not the case, and the valves are thought to be correct, when if fact they are not.
If you have a three valve system, then the cold water inlet valve at the bottom needs to be open, the hot water outlet valve at the top needs to be open, and the bypass valve connecting the cold water line to the hot water line needs to be closed. If this bypass valve is incorrectly left open, it allows the cold water into the hot water line and you won't have hot water.
The valves are normally open when the valve handle ends are running the same way as the pipe.....and closed when the valve handle ends are crossing the pipe. It's real easy to mistakingly think the bypass is closed when it reality it is open, since the bypass line runs a different way than the water lines do.
We just talked about this yesterday in another forum. There are several pics and diagrams to show the proper valve turns.
No Hot Water
Every now and again there also runs the possibility that the valve is faulty and the handle isn't showing correctly if the valve is open/closed.
When you open the outside water heater access panel, there should be a tag in there that has you water heaters brand/model #. That would help everyone tremendously in troubleshooting your problem.