Thank you JamieGeek, you were spot on.
I have 3 shut-off valves, 1 for the HW tank, 1 for the Water Pump and I'm not sure about the 3rd one.
Unfortunatly I did turn on the 120V HW heater. The tank is now heating up with LP and ELEC. Not sure if the Elec heater is working. But the water is getting hot.
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