From the bloggers at RV Travel
I am freaking out! The temperature got down to 25 last night and we have water in our water heater and one gallon of water and a chemical in our black tank. We did blow out the water lines. Should I be concerned about the tank and water heater freezing last night? We were not expecting the temperature to drop so fast. We are camping and I am scared I am going to find a busted tank. —Rhonda F.
I doubt any damage was done with one night below freezing, but if the temps are due to dip that low again, you’ll probably have to fully winterize the RV, including the water heater. If you have no water in the hot lines, the only way to blow out all the fresh plumbing lines with the water heater filled is to bypass it via the bypass valves. Perhaps you only need to drain the heater and all will be fine. You can easily drain the water heater by removing the plug and opening the P&T relief valve on the unit. But do verify all plumbing lines are clear of water — both hot and cold.
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