Square Fire Pit Burners

Square gas fire pit burners from The Outdoor Plus, sold as the burner only, for custom square fire pits and fire tables or to upgrade an existing burner. A square burner follows the lines of your fire feature and carries the flame toward the corners.

Why a Square Burner?

A round ring in a square fire pit lights the center and leaves the corners dark. A square burner follows the shape of the opening, so the flame reaches further toward the corners and the fire fills the whole surface. It's the natural choice for square fire pits and fire tables, especially in modern designs where clean lines matter.

Burner Styles in This Collection

• Square stainless steel burner – available from 6" x 6" up to 60" x 60".
• Square bullet burner – stainless steel, fitted with bullet-style jets for a distinct, defined flame.

Sizing a Burner to Your Fire Pit

Measure the interior of your pan or fire pit, not the outside of the enclosure. Measure both sides of the opening and choose a burner that leaves an even margin on all four sides. Leave open space between the burner and the pan walls: it gives the flame room to draw in air and keeps it from hitting the sides. As a reference, The Outdoor Plus kits typically pair a burner about 6" smaller than the pan, such as a 24" burner in a 30" pan.

A square burner covers more area than a round ring of the same size, so it usually needs more gas. If the corners of a square burner look weaker than the center, the cause is almost always the gas supply: the ports furthest from the inlet are the first to suffer when the line can't keep up.

Plan the Gas Supply First

The BTU rating tells you how much gas a burner needs to reach its full flame. The Outdoor Plus square stainless steel burner, for example, is rated at 80,000 BTU at 12" x 12", 480,000 BTU at 36" x 36" and 1,100,000 BTU at 60" x 60", so the larger sizes need a substantial gas supply. Every product page lists the BTU rating and gas inlet size wherever The Outdoor Plus publishes them.

A burner can only perform as well as the gas line feeding it. Pipe diameter sets how much gas can reach the burner, a long run from the meter or tank reduces pressure, and every fitting and elbow adds restriction. An undersized line is the most common reason a burner never reaches its full flame height. Share the BTU rating with your gas professional so they can confirm the pipe size, regulator and supply before installation.

What Else You'll Need

Our individual burners are sold as the burner only. To complete the installation you'll also need a pan or burner support, an ignition system and gas connections. Our Fire Pit Ignition Systems collection includes The Outdoor Plus 30DC Low Voltage Electronic Ignition System, the 30DC Plug & Play Electronic Ignition System and the Flame Sense Valve with Push-Button Spark Ignition. If you'd rather have everything matched for you, our Gas Fire Pit Burner Kits combine pan, burner and ignition in one package.

Choosing an Ignition System

Match lit systems are the simplest, with no electrical requirement. Flame sense systems add a safety valve that shuts off the gas if the flame goes out, and push-button spark ignition removes the need for matches. Electronic ignition lets you control the fire from a switch, timer or home automation system. Think about how often you'll use the fire and where it sits: long or built-in features are easier to light with spark or electronic ignition.

Natural Gas or Propane

Natural gas and liquid propane are not interchangeable. Propane is supplied at a different pressure and burns differently, so the gas components are set up for the fuel you choose when you order. Propane installations typically use an air mixer at the burner inlet to burn cleanly; without the right setup, propane can produce a lazy yellow flame and soot on the media. If you are not sure which setup your project needs, contact us before ordering.

Ventilation and Drainage

A fire pit enclosure needs ventilation so that gas cannot collect inside the cavity. Place vents on opposite sides of the enclosure so air can flow through. Propane is heavier than air and settles at the bottom, so propane installations need vents low on the enclosure; natural gas is lighter than air and rises, so vents belong near the top. Follow the vent requirements in The Outdoor Plus installation instructions and your local code.

Water is the other thing to plan for. Rain filters down through the fire glass or lava rock, so the pan's drain holes and the base of your enclosure need a path for water to escape. Standing water around the burner and gas components can cause corrosion and uneven lighting. Clearing media dust from the drain holes is a quick seasonal check.

Finishing With Fire Glass or Lava Rock

Fire media hides the burner, spreads the gas for a natural-looking flame and gives the fire pit its finished appearance. Cover the burner evenly, following the depth in the installation instructions: too little media leaves the burner visible, while too much restricts the flame and can turn it yellow. Check the depth at the outer parts of the burner as well as the center, so the flame stays even all the way to the corners. Shop our fire glass and lava rock to finish your build. Fire media is sold separately.

Professional Installation

All gas fire features must be installed by a qualified, locally licensed gas professional, following The Outdoor Plus installation instructions and your local building codes. Keep the clearances to combustible materials listed in the instructions, and do not build a gas fire pit directly under an awning, pergola or other overhead structure.

Need Help Choosing?

Building a square fire pit or upgrading an existing one? Send us your interior opening dimensions, fuel type and gas line size, and we'll help you confirm the right size, burner and ignition before you order. Simply contact us.

Frequently Asked Questions