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caveat, not an agent
That comment, along with the general discussion preceding it, would suggest a sound business reason why an insurance carrier for your area would put a life requirement on water heaters for their policy holders.
Not practical. Do it for roofs, do it for water heaters, do it for washing machines, do it for refrigerators with ice makers, do it for all the plumbing in the house?
Nope.
What the insurance industry does, and is likely to keep on doing, is pay the claims, calculate the loss ratios, increase the premiums to cover the losses, rinse and repeat.