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tHERE COULD BE THREE THINGS 1) SIMPLY A BAD RELEIF VALVE REPLACEMENT WILL SOLVE THIS. 2) IF IT A GAS HEATER IT MAY NEED AN EXPANSION TANK TO RELEIVE THE EXPANSION CAUSED BY THE QUICK RECOVERY OR HEAT UP OF THE WATER 3) TOO MUCH WATER PRESURE INCOMING TO THE TANK

AnswerPossibly overheating due to high temperature setting or faulty thermostat.
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12y ago
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14y ago

It sounds as if it is not an overflow but rather the pressure/temp safety relief device on the tank that is leaking. If this is the case that happens often and the valve must be replaced. You should call a plumber for this, but if you are going to do it yourself, shut off the gas and water supplies to the unit, drain the water level down below the valve and replace it. Just be sure that when you purchase the new one there is a rating tag on the valve and you get one of equal or greater capacity. Lasdtly the sensing elements come in different lengths. Be sure you don`t get one that is longer than what is there now.

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12y ago

It can be caused by 2 things. First it is called a temperature/ pressure relief valve. It can go off if the temp in the tank gets to hot or if the pressure in the tank gets to high (more common on rule pressure systems) Bad water can cause corrosion on the valve also

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11y ago

Shut off water supply and power to the heater. Drain water from hot water tank then change pressure relief valve which is located at the top of water flow pipe.

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13y ago

Pouring = ruptured pressure vessel

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Q: Why is your overflow pouring out hot water from your heating system?
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