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I know but I suspect that's on new ones. I'm convinced the old ones were made more durably. Plus mine is inside the house (finished basement) and not in an attic or garage so I have to believe that has helped too. But yeah, I know I'm on borrowed time. I just can't make myself change it proactively.Truthfully the draining etc that people do is unnecessary, other than make them feel like they are prolonging its life cycle. You should feel fortunate you have 20+ on yours. The industry average lifespan of a residential heater is hovering around 7-8 year average.