I've heard several opinions, but a common rule of thumb seems to be about every 5 years. A great deal depends, of course, on how acidic your water is, and whether you leave the water heater filled or empty while the trailer is in storage. For us TM owners, a better rule of thumb might be to check it when the trailer is four years old or so. If it is completely corroded away, then replace it and remind yourself to check it again in two years. But if it is still in good shape, leave a note for 4 more years.
Household water heaters also have an anode rod, though few people know it and almost nobody changes it. And most household water heaters have a warranty period of 7 years. Do you think there might be a connection ... ?
Bill
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