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You can and should vent the gas from your hot water heater to the outside of your home. Traditionally, these gases were vented back to other gas appliances, like stoves or furnaces, but many jurisdictions have outlawed this practice due to the risks it provides. 

Most water heaters today use atmospheric venting that exhausts the gas out of the home through a pipe.

No, you shouldn’t leave a gas line uncapped because it can allow gas to escape into your environment, which can lead to fires, explosions, and health hazards. That’s why it’s critical to properly cap and seal any unused gas lines as soon as you can. If you’re not comfortable with that, you can always call a licensed plumber to safely handle it for you. 

Running a natural gas line costs between $260 and $820, with an average cost of $540. Gas line repairs cost between $15 and $25 per linear foot, and the cost depends on the type of fittings and connectors, the piping needed, and the mounting hardware. The pipe’s location also matters as it will take more time and labor to access underground pipes than aboveground pipes.

Gas lines are built for longevity, so they can last up to 50 years when installed properly. However, normal wear and tear are possible, especially in moderate climates. Having a plumber or local gas company inspect your gas lines every year is best to ensure there are no hidden leaks or other dangerous problems.