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Having an auxiliary heating system with a hot water option was a high priority for us. Specially on longer trips in colder regions, a warm shower and warm interior makes a huge difference for you personal comfort. There are many different ways of heating air/water in an RV. For us a Diesel powered coolant heater. If you remove the cover on the temperature control module on the front of the old water heater, depending on the model you have, there are 2 nice sized rolls of copper wire.. Do not shut the water off if you have not turned the gas going into your gas hot water heater off. If the water continues to heat inside the water heater after the water is shut off the heater.