Assertion: water heater's lifespan | /r/HasProperty | 8 to 12 years
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Source sentences:
text: The average lifespan of a water heater is 8 to 12 years, and no matter how well you maintain it, eventually sediment will build up, affecting the efficiency of the appliance and reducing the available volume for hot water.
text: Heat pump water heaters have a longer lifespan (around 13 to 15 years) than conventional electric water heaters (around 8 to 12 years), making them a great investment.