I don't know much or really anything about water heaters. What I've been led to believe is that a lot of the issues with water heaters is a buildup from the impurities in the water. I had a two-tank water purification system put in my house a couple of years ago, when they installed it, they drained my water tank and told me the heater life would be extended. As I said I do not know anything about water heaters, but I do know that I was changing my water filter in my refrigerator every 6 months, and they are not cheap. I haven't had to replace one in years. I believe it might be worth the expense to see if this is an option, not only will you extend the life of the heater, but you'll get clean water.
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