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Gas or electric? Gas, the most common problem is the thermocouple being bad. If you have a pilot light that is on but the heater will not light, that is probably the problem. Easy enough to fix. Electric, check the breaker first. It they are on, it's probably one of the heating elements burned out. Probably the top one, but it can be either. These are also easy enough to change.

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Q: My hot water heater won't heat the water?
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