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Hey y'all. I need a simple explanation of why backflow preventers are needed on domestic potable hot water tanks. About 4 years ago our area started requiring them along with potable expansion tanks of course. I understand why a boiler system needs them, because boiler water is nasty stuff. But not why a potable water heater? I'm hvac so I'm not so much into the plumbing, but I've seen several systems where the expansion tank pressure has not been maintained and the result is a flooded basement. What problem is being dealt with and is it worth creating the flooding problems? Thanks for your information.