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 Water heater leaking around gas valve
Also read: Leaking-water-heater
Automatic water heater shut off valve
Automatic shut off valve
Automatically shuts off water in case of water leak
Set detector in water heater drain pan
Plug transformer into 120Volt outlet
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Watts floodsafe automatic shut off valve manual
Condensate appears on bottom of pilot tube, indicating water leak
Other evidence can include drips forming on bottom of gas control,
or dripping down manifold tube or pilot tube.

Possible causes:

1) The gas valve is NOT screwed into the tank correctly ... which could happen if gas valve was replaced recently...

Remove gas thermostat 2) The gas valve is bad and the leak is coming through the gas valve.
The gas valve needs to be replaced
How to replace gas control valve
How to troubleshoot gas water heater

3) The leak is coming out around the gas valve at the tank because the threads are rusted out ...
... or the leak is above the gas valve and dripping down.
Causes of rusted tank: depleted anode rod, defective tank (check warranty), stray current corrosion due to household ground connected to water pipe

4) Other areas of water heater can be leaking and not gas valve
Troubleshoot leaking water heater
Warranty coverage
If you need to buy new heater, or apply for warranty coverage.

1) Take photo of the label located on side of tank to find date of manufacture using serial number, and then estimate if warranty is still in effect.
pdf/Find-Age-of-water-heater

2) Contact the manufacturer with the serial number.

Warranty will cover the tank.
Possibly at pro-rated basis.
More billsNew heater?
If you are going to buy another heater out-of-pocket, read following run-down.
Which-is-best-gas-water-heater

If you are installing yourself, read following:
How-to-install-gas-water-heater

"It is possible to limp along with a failed water heater if the leak is slow and if you turn off power and water when not using hot water. A hot tap needs to be left open also to prevent pressure build-up in tank. This trick could buy you some time, possibly up to 3 months. With time, you can consider how to make the system do more for less as well as comparison shop, get competitive bids, etc
Anode rods Tank pressurePrevent leak and rust problems in future:

1)  Inspect for leaks periodically/ install leak detector/ shut off water to house when not home
Troubleshoot leaking water heater

2) Replace anode rod periodically
How to replace anode rod

3) Turn down level of water softening

4) Make sure water pressure does not exceed 80 psi
water pressure test and troubleshoot

Buy:
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Watts telltale Pressure Gauge 276H300
Temperature pressure gauge

Telltale pressure gauge is left in place for a day, and marks the highest pressure so user can tell if there are pressure spikes that are causing TP valve to leak water, or other possible problems
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Troubleshoot gas water heater
Troubleshoot electric water heater
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