Anatomy of a Gas Fire Pit: Every Component Explained

By the Outdoor Heat Direct fire feature team · Authorized The Outdoor Plus, American Fyre Designs, Prism Hardscapes and Firegear dealer · Reviewed September 2026

What are all the parts of a gas fire pit, from the ground up?

Underneath is a box. Inside the box is a sheet-metal tray. Bolted through the tray is a tube with holes in it. Feeding that tube is a metered gas path. On top sits the part you actually look at. Everything else is weather protection.

No two sellers draw the line between "the fire pit" and "the parts" in the same place. A finished table arrives with twelve of these assembled, a burner kit gives you five, a masonry build gives you none — which is why our components department exists.

Does the enclosure material change how a fire pit performs?

It changes weight, freeze behavior and finish — not how the fire burns. GFRC, glass fiber reinforced concrete, dominates premium fire tables: thin-wall cast concrete with alkali-resistant fiber instead of rebar, which is how a 60″ table ships at a weight two people can move. Powder-coated steel is cheaper but lives or dies by its coating. Aluminum is rare — our catalog carries one aluminum item, a torch post. Site-built is the fourth path: a steel-stud box skinned in cement board and tiled, which puts every requirement below onto your installer.

Why is the drain hole the part nobody thinks about?

Because it is a hole. Nobody photographs a hole, and it is the most common reason a gas fire pit stops working after a wet week. There are two of them.

Firegear specifies ¼″ drainage holes in the burner pan "to prevent standing water in pan." The enclosure needs its own escape at floor level — American Fyre Designs calls for two 1″ × 4″ openings at floor level, 180 degrees apart, for drainage specifically, separate from the vents. Trapped water corrodes the valve and ignition, fills burner ports so the flame goes ragged, and in a freeze expands inside a concrete base and cracks it. That last one is not a warranty claim.

Does a propane fire pit enclosure really need vents?

Yes, and placement is not negotiable. Propane vapor is roughly 1.5 times the density of air, so a leak inside a sealed cabinet does not dissipate — it settles to the floor and waits. Natural gas rises out on its own. The published figures converge.

The Outdoor Plus requires one vent on at least two sides, 18 square inches each (example: 3″ × 6″ or larger), placed mid-to-low. Firegear requires 18 square inches of cross ventilation on opposite sides — three 2″×3″ slots per side, or two 6″×12″ vents. American Fyre Designs goes further on tank-in-base models: four openings, 10 sq in free area each, 40 sq in total. Cross ventilation is the operative phrase: two vents on the same wall move nothing.

What is the difference between a fire pit pan and a burner?

The burner is the gas tube with the ports. The pan is the tray it bolts into. They ship together often enough that the words get swapped and people order the wrong one. The pan carries the media load, keeps glass and rock out of the ports, and sets recess depth so flame sits below the rim.

Firegear calls for 2½″ to 3″; The Outdoor Plus distinguishes a drop-in pan recessed 4″ from a flat pan recessed 2″ minimum, and custom builders set the pan 3″–5″ below the finished surface with 6″ from burner to edge. Burner shape — cross, H, linear, ring, bullet — drives flame pattern more than BTU does; see our burner types guide. All 22 items in our burners collection are The Outdoor Plus, from $76.

Why does propane use a different orifice than natural gas?

Because propane carries roughly 2.5 times the heat content per cubic foot and arrives at higher pressure. Same hole, same seconds, far more energy. The Outdoor Plus is explicit about the fix: going from propane to natural gas means removing the LP air mixer and orifice and fitting the NG mixer and NG orifice; the reverse removes the NG mixer and adds an LP regulator with the LP orifice. American Fyre Designs part-numbers orifices by fuel and burner size.

How does a gas fire pit actually get lit?

Three tiers, and the gap between them is the largest line item in most builds. Match-lit is a manual key valve plus a long lighter: cheapest, most reliable, no electronics, no automatic shutoff. Push-button spark adds a piezo or battery igniter to that same valve. Electronic ignition with flame sensing adds a control module, an electrode and a flame rod that closes the valve when flame is lost. American Fyre Designs charges a flat $2,570–$2,571 for FyreStarter across every model; The Outdoor Plus rates theirs Mini 195,000, Standard 295,000, High 500,000 BTU. See match lit vs. electronic ignition.

Where do the valve, shutoff and flex line go?

The user-facing control is usually a key valve through the enclosure face. The Outdoor Plus requires it "readily accessible," with no kink in the flex line behind it — it is the part you reach for when something goes wrong. A separate manual shutoff belongs in the supply line: American Fyre Designs requires one within 6 feet of the unit and easily accessible, Firegear one at the exterior house wall, Prism Hardscapes a ½″ NPT gas-rated ball valve. Our key valve selection is small — three items, $44 to $92.

The connector between rigid pipe and appliance must be certified, rated to the product's maximum BTU and listed to ANSI Z21.75 / CSA 6.27. Use whistle-free hose only; yellow corrugated flex whistles at full flow. On propane the cylinder connection is a QCC-1 coupling with integral regulator under ANSI Z21.58 / CGA 1.6, hand-tightened. Upstream, American Fyre Designs specifies ½″ minimum interior diameter pipe — undersized runs are the top reason a fire pit never reaches rated flame. See gas line sizing before you trench.

How much fire glass or lava rock goes over the burner?

Less than people think. Media restricts the outlet, and overfilling builds back pressure — ragged flame, delayed ignition, pops on shutdown. The Outdoor Plus specifies ¼″ to ½″ of fire glass over the burner and says plainly: do not overfill. For lava rock they allow a 2″ layer with no more than 1″ above burner height. Firegear sets the same 1″ ceiling and requires base media at 1″ minimum diameter. American Fyre Designs caps either media at 2″ above the burner. Which you pick is a heat and maintenance trade: fire glass vs. lava rock. Both are in our fire glass and media collection, from $19.

When does a wind guard stop being an accessory?

When you have flame sensing and any exposure. On a match-lit unit wind is annoying — the flame lays over and you burn gas for less heat. On an electronic system wind is a shutdown: the sensor loses flame, the module closes the valve, and you relight all evening. Rooftops, lakefronts and anything above the second floor should budget for one from day one. The nine guards in our wind guard collection run $380 to $696.

Is a fire pit lid the same thing as a cover?

No, and the words get swapped constantly. A lid is a rigid plate — stainless, aluminum or matching concrete — that drops over the burner opening and turns the fire pit into a table surface you can set drinks on. Lids are sized to specific openings, so you order by model and dimension; our lid range runs 53 items from around $161. A cover is a fitted fabric bag that goes over the whole unit for weeks at a time, keeping rain, needles and pollen out of the media and the cavity. Our weather cover selection holds four, from $67, because most brands sell covers model-matched to their own tables.

Where does the propane tank live if it does not fit inside?

A standard 20 lb cylinder is roughly 12″ in diameter by 18″ tall, holds 20 lb / 5 gallons maximum, and must have a collar protecting the valve. Round bowls, narrow linear tables and anything under about 20″ tall will not swallow that, which is why only nine of our units carry a tank bay in the base; on everything else the tank moves into a matching side cabinet that holds it, vents it and runs a hose across. Our tank enclosure collection carries eight, $260 to $682, mostly Prism Hardscapes and American Fyre Designs. If natural gas is an option, take it: a 20 lb tank holds about 430,000 BTU, roughly 6.6 hours at 65,000 BTU/hr.¹ See natural gas vs. propane.

What fails, what symptom it gives, and which part is to blame

Most parts lists are exploded diagrams. This is the same appliance read backwards — from the thing going wrong to the component that caused it.

A gas smell means shutting off the supply and calling a licensed gas technician before relighting. Longer walkthrough: why won't my gas fire pit light.

What actually comes included, depending on how you buy?

This generates more surprised phone calls than anything else, and nobody publishes the answer side by side. The same fire pit can arrive as one box or as nine.

The fire pit kits collection is the middle path at 88 items, and our complete fire pit buying guide works through the decision. Sizing the opening: what size fire table do I need, with 110 finished tables to measure against. If gas is not settled, gas vs. wood burning fire pits is the prior question — none of these parts exist on a wood unit.

Fire pit component questions we get asked