Re: Water Gushing Outside of the house
First, turn OFF the water heater. If electric, turn off the breaker or remove the fuse(s), if gas or oil burner shut down the supply valve to the burner and turn off the switch and/or breaker if fan assisted. Next close the cold water valve to the water heater.
Temperature Pressure Reducing Valve (TRPV) on the storage water tank's drain path.
The TRPV is a safety device, when operating correctly will open in the event that the temperature or pressure within the water tank exceeds safety limits.
Another possibility is a floor drain or water vessle PAN's primary or secondary drain. A catestrophic failure of the tank itself (rupture, etc. of the inner tank beneath the insulation or a nearby water line might drain/leak to this same area).
Both drains should be indirectly plumbed (air gap).
A drainage spigot at the base of the water vessle is often controlled by a gate valve, many times of the cheap plasticy variety. These too can fail or get bumped open, or bumped broken.
The hot water lines may continue to drain back into the emptying tank by gravity even after you close the incoming cold water line's valve to the vessle. To speed up this emptying process, after closing the cold water inlet valve to the tank, open several faucets on the hot water side, at the highest and lowest parts of your hot water system (to allow air to enter and the water to drain).
Last edited by Gray Watson; 09-07-2009 at 11:50 AM.
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