Considering how much financial cost is incurred when a hot water tank leaks, it's odd that they are made of steel that rusts out in ten years or so. It didn't used to be this way. Hot water tanks used to be made from bronze. I picked up a couple on the side of the road back when we used to have oversized trash and garbage day once a year (a wonderful flea market that sadly got shut down). So when the crappy modern tank in my basement bit the dust I replaced it with the bronze one. It is an "Everdur" brand, and had an old warranty card in it good for fifty years! It's now well onto its next fifty and presumably will last as long as the copper "pipe" in the house. In my case no harm was done by the old tank leaking, as the basement is an unfinished workshop junk storage area and flood water just drains out the low corner when it comes in. It's funny that the crappy modern tanks are accepted. You'd think insurance companies would push for stainless ones at least.