Outdoor Gas Fireplace: The Complete Guide

An outdoor gas fireplace turns a patio into a three-season living room, giving you instant fire at the push of a button with no wood, no smoke, and no ash to clean up. Whether you want a built-in stone fireplace as a backyard centerpiece or a portable fire table for the deck, gas delivers clean, controllable warmth. Because it involves a gas line and open flame outdoors, doing it right — and safely — takes some planning. Have gas connections made by a licensed pro.

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Why Choose Gas Over Wood Outdoors

Wood fire pits are cheaper up front, but an outdoor gas fireplace wins on convenience and control:

• Instant on and off — no kindling, no waiting, no dousing embers before bed.
• No smoke blowing in faces or drifting to neighbors, and no spark risk to your roof or landscaping.
• Adjustable flame so you dial the heat and look you want.
• No wood storage, no ash cleanup.
• Often allowed under burn bans where open wood fires are prohibited (check local rules).

The trade-offs are higher cost and less of that crackling-wood character, though the convenience wins most people over.

Types of Outdoor Gas Fireplaces

The category covers everything from a movable table to a masonry monument:

• Built-in masonry/stone fireplaces: Permanent structures with a chimney, faced in stone or stucco, that anchor a patio. The premium option, $3,000 to $20,000+.
• Prefab / pre-built fireplace units: A manufactured firebox you frame and finish, cheaper and faster than full masonry.
• Fire tables: Table-height units with a burner in the center, doubling as patio furniture. Popular and portable, $300 to $2,500.
• Fire pits: Round or square open gas burners at seating height, $200 to $3,000.
• Fire columns / bowls: Vertical or sculptural accent pieces for ambiance.

Fuel: Natural Gas vs. Propane

This choice shapes cost and placement:

Natural gas

Connects to your home’s gas line for an endless supply and lower per-BTU cost — you never refill a tank. The downside is the up-front plumbing: running a line to the patio costs $500 to $2,000+, and the fixture becomes permanent. Ideal for built-in fireplaces and fixed fire tables.

Propane

Runs off a portable tank (a 20-lb grill tank or a larger buried tank). No plumbing, fully portable, and great for renters or decks far from the gas meter. A 20-lb tank runs a typical burner for a few hours per fill; larger units burn through it faster. Propane also delivers more BTU per cubic foot. The trade-off is refilling and higher per-hour fuel cost.

Heat Output and BTU

Outdoor units run much higher BTU than indoor ones because heat dissipates into open air. Expect:

• Fire tables and pits: 30,000 to 65,000 BTU.
• Built-in fireplaces: 50,000 to 90,000 BTU.

Higher BTU means a warmer radius, but outdoors you are heating people, not a room, so seating position matters more than raw output. Plan seating within 4 to 6 feet of the flame for real warmth on a cool evening.

Installation and Costs

Costs span a wide range by type:

• Portable propane fire table/pit: $300 to $2,500, essentially no installation — assemble and connect a tank.
• Natural gas line run to the patio: $500 to $2,000+ for a licensed plumber.
• Prefab built-in fireplace: $2,000 to $8,000 installed.
• Full custom masonry fireplace: $8,000 to $20,000+.

A portable propane unit is genuine DIY. Anything hard-plumbed to natural gas, and any built-in with a chimney, requires a licensed gas fitter and often a permit. Built-in masonry work also needs a mason and proper footings. Get the gas connection pressure-tested and inspected — an outdoor leak is still a leak.

Placement and Clearances

Where you put it affects safety and enjoyment:

• Keep the fireplace well clear of the house eaves, wood structures, fences, and low branches — follow the manufacturer’s clearance to combustibles.
• Set it on a stable, non-combustible base (concrete, pavers, stone).
• Account for prevailing wind so flame and heat are not constantly blown out or toward the house.
• For a built-in with a chimney, keep the flue clear of overhangs so it drafts properly.
• Do not place any gas fireplace or fire pit inside an enclosed or fully covered space — they are for open-air use, and enclosing them risks carbon monoxide buildup.

Safety Rules

Gas outdoors is forgiving because of open ventilation, but never careless:

• Only use outdoors in open air. Never operate an outdoor gas fireplace in a garage, screened room, or under a low enclosed roof — carbon monoxide can accumulate.
• Check for leaks at every connection with soapy water (bubbles mean a leak) whenever you connect a propane tank or after any service.
• Store propane tanks upright, outdoors, never in a hot garage or indoors.
• Keep a fire extinguisher nearby and never leave the flame unattended.
• Supervise children and pets — surfaces and glass wind guards get very hot.
• Turn off the gas at the valve/tank when finished, not just the burner control.
• Cover the unit when not in use to keep burners and igniters clear of water and debris.

Features Worth Having

• Electronic or push-button ignition for easy, reliable lighting versus manual match-lit.
• Flame-height control to adjust ambiance and heat.
• Wind guard / glass surround to keep the flame steady on breezy nights.
• Weather-resistant materials — stainless steel burners and covers resist corrosion outdoors.
• Lava rock, glass media, or ceramic logs to finish the look.

Design Ideas for Your Patio

An outdoor gas fireplace can be more than a heat source — it shapes how the whole patio works:

• Anchor a seating area. Position a built-in fireplace as the focal point with an arc of chairs or a sectional facing it, 4 to 6 feet away for warmth.
• Define an outdoor room. A tall stone fireplace acts as a partial wall, giving an open patio a sense of enclosure and blocking wind.
• Double up with a fire table. A fire table doubles as a coffee or dining surface, keeping the center of a conversation area warm.
• Frame a view. Place a linear fire feature low so it doesn’t block a backyard or water view.
• Match your materials. Face a built-in in stone, brick, or stucco that echoes your home’s exterior for a cohesive look.

How Weather and Climate Affect Your Choice

Where you live should steer the decision. In wet or coastal climates, prioritize stainless steel burners and covers that resist corrosion, and always cover the unit when idle so water doesn’t pool in the burner ports. In cold climates, a higher-BTU built-in extends your usable season into late fall, and a wind guard keeps the flame steady on gusty evenings. In dry, fire-prone regions, gas has a real advantage over wood — no flying embers — but keep the unit clear of dry brush and check whether local burn bans still apply (they usually exempt gas appliances, but confirm). Hot, humid areas benefit from portability: a propane fire table you can move or store means you’re not committing patio space to something you’ll only use a few months a year.

Maintenance

Outdoor units face weather, so upkeep matters. Cover the fireplace or table when idle, and before each season check the burner ports for spider webs and debris (bugs love to nest in gas orifices), clean the igniter, and inspect hoses and connections for cracks or leaks. Wipe down stainless surfaces, empty any water from fire media, and confirm the propane hose and regulator are in good shape. For built-in units, have the gas connection and burner professionally checked yearly. A well-covered, well-maintained outdoor gas fireplace lasts many seasons.

Adding an Outdoor Fireplace Insert to a Masonry Firebox

If you already have a wood-burning masonry fireplace on the patio, an outdoor fireplace insert can convert it to gas without tearing out the stonework. The insert, or a gas burner and log set made for the space, sits inside the existing firebox and gives you push-button flame in place of split logs and ash.

Use Outdoor-Rated Units Only

Indoor gas inserts and log sets are built for sealed rooms, dry conditions and indoor venting. Outdoors, rain, wind and temperature swings can damage controls, corrode valves and blow out pilot flames. Choose a unit that the maker lists for outdoor use, with weather-resistant controls, a thermocouple or electronic ignition built for wind, and stainless steel burners. The manual should state outdoor installation plainly. If it does not, the unit is not the right choice.

Check the Firebox First

Before buying, have the masonry inspected. Cracked firebrick, loose mortar joints or a damaged chimney crown should be repaired first, since an insert will not fix structural problems. Measure the firebox width, depth and height at the front and back, because many fireboxes taper. The insert listing will give minimum dimensions, and a unit that is too large can trap heat against the masonry.

Gas Supply Is a Job for a Licensed Gas Fitter

Running a line to an outdoor firebox, sizing the pipe, setting the shutoff valve and pressure-testing the connections all belong with a licensed gas fitter. Most areas require a permit and inspection. Propane and natural gas use different orifices, so the unit has to be set up for the fuel you actually have. Never attempt the connection yourself.

Clearances and Placement

Follow the clearances in the installation manual for the mantel, any wood trim, overhead structures and nearby furniture. A gas flame still heats the face of the fireplace, and outdoor kitchens or pergolas built close to the opening can be at risk. Keep the chimney or flue open and clear of overhangs so combustion gases rise away from seating.

Never Use It in an Enclosed Space

Outdoor fireplaces rely on open air to carry away carbon monoxide. Do not install or run one inside a screened porch, a sunroom, a garage or under a patio that has been walled in on most sides. If your patio is partly enclosed, ask the gas fitter whether the setup still counts as open air under the manual and local code.

Ongoing Safety

Turn off the gas at the shutoff valve after each use, cover the opening when it rains, and book a yearly service visit to check the burner, valve and connections. If you smell gas, leave the area right away, do not light anything or operate switches, and call the gas utility from a safe distance.

The Bottom Line

An outdoor gas fireplace extends your patio season with instant, smokeless, controllable fire — from a portable propane fire table you set up in minutes to a custom stone fireplace that anchors the whole backyard. Pick natural gas for endless fuel and a permanent installation, or propane for portability. Keep it in open air, maintain proper clearances, check for leaks, and have any hard-plumbed gas work done by a licensed pro. Do that, and you get years of easy evenings around the fire.