Average Life of a Water Heater
by 
The Curious Bag
ANSWERS: 5
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The average life of a water heater is around 13 years. This will vary depending on whether a particular heater is a gas-fired, electric or tankless unit. Source: http://www.ciohi.com/page5.html
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The average life of a water heater varies depending on whether the tank uses gas or electricity. Electric water heaters last about 14 years, while a gas heater lasts between 11 and 13 years. Source: http://www.ciohi.com/page5.html, http://www.oldhouseweb.com/how-to-advice/life-expectancy.shtml
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They rate the water heaters in 6 yr, 12yr and more but it depends on several factors the biggest being whether your utility uses surface water or ground water. Ground water contains more calcium hardness and will plate out faster. This usually cuts the life in half....
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I wouldn't say my case is typical but we had a water heater that was around for at least 40 years and it finally went back in the summer. Other things that will ruin a water heater are the pressure release valves. So when you're replacing a water heater make sure to have that looked at too.
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Got up, switched on, got hot, waited, switched off and went to sleep. Got up, switched on, ...
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