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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.

The biggest disadvantage of propane is that heating systems and appliances powered by propane tend to cost more than gas-powered ones. Propane is also dangerous since it can create frostbite if it touches the skin and can easily combust if mishandled. It’s also quite cumbersome to buy or replace propane tanks, so many people choose to have propane delivered to their homes—an extra cost and logistical challenge that can be a headache.

Not all gas fireplaces need a chimney. If you install a ventless gas fireplace, it will release low levels of combustion byproducts back into your living space (instead of pushing them outside through a chimney or vent). Ventless fireplaces burn fuel efficiently, so the emissions are minimal—but they could bother people with allergies or respiratory issues.

In North America, pipe measurements are listed as the nominal pipe size (NPS). This measurement refers to the outside diameter. As an example, a 1/2-inch copper pipe has an outside diameter of 5/8 of an inch. If a hardware store lists a pipe as having a 2 NPS, it means that all the pipes with this measurement have a 2 ⅜-inch outside diameter, regardless of wall thickness and inside diameter.