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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. 

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.

Natural gas companies advise only shutting off the gas supply at the meter yourself if you smell natural gas or suspect there is a leak, typically following an emergency. Instead, you can shut off gas to individual appliances when necessary. If you want to turn off your natural gas entirely, you should contact your utility company. You’ll generally also need to acquire a permit to work on your natural gas line.

In most cases, a flexible steel hose connects your gas line to the wall. This process is typical if you are replacing your gas stove or if the old pipe has worn down. However, always leave this job for a professional plumber. Errors can be very dangerous, so it's worth calling a professional to take a look.