I have a '93 Fleetwood, not driving for now. Couldn't get propane for a while, When I did, I discovered the water heater is just trashed, corroded, useless. A friend gave me a 10 gal electric residential water heater. I will install the electricity directly to the main house breaker box with it's own 20A breaker. What I need is instruction on unhooking the water lines from the rv water heater and routing them to the little electric one. Do I really need to completely remove the old rv water heater? Or can I just unhook it and leave it there until I'm ready to buy and install a new one?