Originally Posted by Jblev
The water heater is propane and it is working. It has a tank and works on demand. When I am hooked to city water it senses flow and kicks on when needed. When using water pump, it appears the water isnt going through the hot water tank. The propane never kicks on to heat the water?
One or the other, not both.
A water heater with a tank heats the water to a given temperature and only fires the propane (or electric heater or both) when the temperature in the tank reaches a lower threshold. This can be due to ambient heat losses or the intrusion of cold water as the hot water exits the tank to the faucets and/or shower.
An "On Demand" or tankless water heater only fires the propane when there is enough water flow sensed through the heating coils in the tank; heating the water as it flows through the heat exchanger.
So which one do you have again?