Fire Pit Installation: Gas vs. Wood, Codes, and What Clients Actually Want

Clients want ambiance. What they actually need is the right BTU output, proper setbacks, and a clear explanation of why gas wins in most suburban installs.

Every client who asks for a fire pit imagines the same thing: friends around the fire, cool evening, cold drink. What they haven't thought about is HOA rules, gas line routing, burn bans, or what happens when they try to light a wood fire in an HOA-restricted community and get a code violation notice two weeks after you finish the job.

Your job before the first shovel goes in is to understand the site constraints, ask the right questions, and help the client pick the option that actually works for their situation.

Gas vs. Wood: The Honest Breakdown

Gas fire pits win in most suburban installs for three reasons: no smoke, no ash, no burn ban risk. Clients can turn them on and off with a key valve or electronic ignition. They're cleaner, easier to maintain, and more likely to actually get used.

Wood fire pits are simpler to build and cost less to install. No gas line, no regulator, no burner kit. They're ideal for rural properties without HOA restrictions, properties that already stockpile firewood, and clients who specifically want the crackling wood fire experience and understand the trade-offs.

The conversation goes: "Gas is cleaner, no ash cleanup, works in most HOAs, and you flip a switch. Wood is more traditional, costs less to install, but you're managing ash and wood storage, and during burn bans you can't use it. Which fits your situation better?" Most clients choose gas once they hear that framing.

Code Requirements: LP Gas Setbacks and Safety Rules

LP gas fire pits must maintain a 10-foot minimum setback from any structure, fence, or overhead obstruction. That includes the house, wood fences, pergola posts, and overhead shade sails. This is the NFPA 58 standard and most municipalities adopt it directly or have something stricter.

Measure from the fire bowl edge, not the pit wall. A 48" diameter fire bowl set into a 72" diameter stone surround needs 10 feet of clearance measured from the bowl rim to the nearest combustible structure.

• Natural gas: requires a licensed plumber or gas fitter to run the line and make the connection. Never do this yourself without a license.
• LP (propane): most jurisdictions allow a contractor to install the burner kit and connect to a portable tank. The gas line itself still requires a licensed gas fitter in many states — verify locally.
• Electronic ignition systems require a 120V outdoor-rated outlet within reach of the control module.
• Always check with the local municipality before installation — Austin, for example, has additional restrictions in certain fire hazard zones.

BTU Output: Sizing the Burner for the Space

BTU output determines how much heat the fire pit produces and how large the flame looks. Most residential gas fire pits run 40,000–100,000 BTU. Here's how to think about sizing:

• 40,000–60,000 BTU: Appropriate for smaller patio fire pits, 24–30" bowl diameter. Good for ambiance, modest heat output. Works well in Texas where you're not trying to heat an outdoor space in January.
• 60,000–80,000 BTU: Mid-range, covers most residential installs. 30–36" bowl. Visible flame height of 8–12" looks impressive and provides meaningful warmth in cool weather.
• 80,000–100,000 BTU: Large format or commercial installs. 36–48" bowls. Impressive flame height, significant heat output. Requires larger supply line and regulator to support the flow rate.

Match the burner BTU to the ring diameter. A 60,000 BTU H-burner typically fits a 24" diameter ring. Don't oversize the burner for the bowl — you'll get uneven flame distribution and excessive heat at the fire media.

Fire Pit Ring and Bowl Sizing

The fire ring sits inside the fire bowl and distributes gas to the burner. Size the ring to the interior diameter of the bowl, with 2–4" of clearance on each side for fire media (lava rock, fire glass, or decorative logs).

Common sizing combinations: 18" ring in a 24" bowl, 24" ring in a 30" bowl, 30" ring in a 36" bowl. The depth of the bowl matters too — 6–8" of depth for lava rock media, 8–10" for decorative logs.

For custom stone-built fire pits, the interior bowl dimensions need to be finalized before masonry work begins. Trying to fit a burner kit into an incorrectly sized opening is a frustrating field problem. Know the burner dimensions first, build around them.

"We spec the burner kit before we draw the seat wall. Every time we've done it backward, the stone work needs to change to make the burner fit."

Construction Details for Built-In Fire Pits

Built-in fire pits with surrounding seat walls are the premium option. They require a concrete footing (4" minimum depth, often 6" in freeze-thaw climates), CMU block core, and a mortar-set stone or concrete cap.

The fire bowl insert must be installed in a refractory liner or surrounded by non-combustible material. Regular mortar will crack from repeated thermal cycling. Use refractory cement (type S or better) for all joints within 12" of the fire bowl.

Gas line access: plan the routing before the concrete work. The supply line typically enters through the base of the fire pit wall — a 1" sleeve embedded in the footing keeps it clean. The shut-off valve goes in an accessible panel or key valve on the outside of the structure.

Frequently Asked Questions