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If its a gas water heater then it may be a bad thermostat or the temperature is set very low or in some cases the wind from a storm could blow the pilot flame out and in time the water turns warm then cold.

If its a electric water heater it could be that the bottom element is not working or the dip tube is damaged or the set water temperature is set on low.

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Q: What might be the problem when the water from the heater is not hot but warm?
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