Choosing the Right Gas Line and BTU Size for Your Outdoor Gas Fire Pit
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When designing an outdoor gas fire pit, one of the most crucial yet overlooked elements is the proper sizing of the gas line and burner BTUs. These two components determine not only how well your fire pit performs but also how safe and efficient it will be for long-term use. At Hannah Outdoor Designs, we take these technical details seriously to ensure our clients enjoy both beauty and functionality in their outdoor living spaces.
Why Gas Line Sizing Matters
The gas line is essentially the fuel delivery system for your fire pit. If the line is too small, it can’t deliver enough gas to the burner, resulting in a weak flame or, worse, a fire pit that won't ignite. Conversely, an oversized line can be unnecessarily expensive and complicated to install.
Gas line size depends on:
The length of the gas line run
The total BTUs required by the burner
The type of gas used (natural gas or propane)
Understanding BTUs
BTU (British Thermal Unit) is a measure of energy. For fire pits, it determines how much heat the burner will output. Most outdoor fire pits range from 40,000 to 200,000 BTUs, depending on size, design, and intended use.
Here’s a general BTU guide for outdoor gas fire pits:
Small fire pits (24"-30"): 40,000–70,000 BTUs
Medium fire pits (36"-42"): 90,000–125,000 BTUs
Large fire pits (48"+ or custom): 150,000–250,000+ BTUs
Keep in mind that larger BTU burners require more gas flow, which circles back to the need for an appropriately sized gas line.
Propane vs. Natural Gas Considerations
Natural gas is ideal for permanent installations with easy access to a home’s gas supply.
Propane is best for remote or temporary fire pits but typically requires higher pressure and specific regulators.
Each fuel type has different requirements in terms of pipe sizing and pressure, so it’s essential to account for this early in the design process.
Professional Installation Is Key
Installing a gas fire pit isn’t a DIY weekend project. It involves local building codes, utility marking, permits, and knowledge of gas line sizing charts and pressure drops. Working with professionals like Hannah Outdoor Designs ensures that your fire pit is not only beautiful but also safe and code-compliant.
