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Replacing a gas valve on a water heater will take a professional plumber between 1 and 1½ hours. However, they may require extra time to diagnose the problem with your water heater, particularly since so many of the surrounding parts work together. Speak with your plumber before the job to confirm the pre-hour price and the approximate length of the job.

Plumbers start by walking around the property to see if they notice any signs or sounds of a gas leak. They can also use tools like electronic gas detectors and infrared cameras to find the source of leaks. There are also detectors that use laser, thermal, and multi-wavelength imaging. All these devices allow a plumber to scan your home and pinpoint the exact location of a leak.

The effect a gas fireplace has on your gas bill will depend on how often you use it, the size of the rooms you’re heating with it, and the BTUs of the fireplace itself, but generally speaking, it should only cost a few cents an hour to run it when it’s on. It will consume minimal energy when it’s “off” if you have a pilot light running constantly, but some modern gas fireplaces don’t require a constant pilot light.

The cost to repair a gas leak is $120 to $250 on average, but it could be as costly as $5,000, depending on the leak location and severity. 

For example, if you have drywall covering the source of the leak, you'll need to hire a contractor to replace the removed drywall. In addition, if the leak is underground, you'll need a contractor to excavate the ground to reach the gas line.