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Don and Janey, we used to fill the water tank and heater at the beginning of the season and empty them at the end. Rarely did I empty them during the season. Now that we're fulltiming we drain and refill the water tank about every four to six months. The water seems to stay just fine. We don't use much from the tank, just when on the road.
Be glad you have the anode rod. That crud it collects would otherwise be shortening the life of the tank.
As for the IR devices, I do the same as the others. Relative temps. Also check hubs for evidence of heating bearings or brakes not equally adjusted.
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