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hot water on demand systems generally have shitty warranties... we have one at the shop that just died after about 4 years. we might be able to replace the switch inside, gonna try that first.
hot water tanks on the other hand are good for 6 years even for the cheapest models, with the good models being 10 years and up.
never actually tried using those warranties though... the few hwt that i've ever replaced have always gone beyond their warranty life.
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