Your hot water heater will not automatically heat when you hook up to city water. The switch on the wall turns it on or off. Some wall switches operate the on/off for both gas and electricity. On my unit, there is a small, black rocker switch located at the bottom left-hand corner of the recessed, exterior "box" where the controls for the HW tank are located. This rocker switch probably has a safety cotter pin in it. This switch controls the 120v electrical operation. If it is in the off position, it wont work off 120v. You might want to check whether or not it is in the correct position.
If I just want to use propane, I need to turn this switch off then turn the wall switch on. If I want to use `120v, then I turn the rocker switch to on, then turn the wall switch on as well. Some of the newer units have a wall switch that makes this operation a bit easier - so you dont have to go outside to flip the rocker switch at the HW tank.
Hope this helps.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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