Originally Posted by donn
1) you do not have the valves in the correct position.
2) you do not have the HW heater plumbed correctly.
3)you have no water in the potable water tank.
4) you do not have the water pump turned on.
Connect the city water to it and see what happens.
5) you have a stuck or clogged check valve near the water heater.
How many water heater winterize valves do you have?
IF you have 3 valves, you probably don't have a check valve.
If you have only 1 or 2 valves you most likely do have a check valve.
We had a poster here recently who found a broken check valve and
he was also getting no hot water.