Is it a dual fuel? If so, turn off the breaker, so you do not burn up the electric heating element if someone accidentally turns on the electric heating element while the tank is dry.
We tend not to use ours, as it is a long ways away from the faucets, and we camp often without utilities.
I usually do keep the tank full, but not heated. We look at it as 6 extra gallons of water if the FW tank runs dry. FYI, we have a 1 ft hose mod to our tank drain, so we can drain into a bucket.
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