Best Way to Heat an Outdoor Patio: Propane, Gas, Electric

For most patios, a propane or natural gas heater in the 30,000–50,000 BTU range is the most practical all-around choice: it works in cold weather, heats fast, and doesn't require any electrical infrastructure. If you have a covered patio with a 240V outlet nearby, a hardwired electric infrared heater is cleaner, cheaper to run, and frankly easier to live with long-term. Pellet heaters are a distant third for most people. The right answer depends on your patio's layout, how exposed it is to wind, and what fuel or power you already have access to. This guide walks through all of it so you can make a confident call today.

Choosing the Right Heater Type

Every outdoor patio heater works by one of two methods: radiant (infrared) heat, which warms people and objects directly in its line of sight the way sunlight does, or convective heat, which warms the surrounding air. In a typical outdoor or semi-outdoor setting, radiant heat wins almost every time because wind immediately blows warm air away. That said, the fuel or power source is just as important as the heating method, and each has real tradeoffs.

Propane

Freestanding propane tower heaters are the most popular option for a reason. They're portable, require no installation, and put out 30,000–46,000 BTU. A standard 20 lb tank runs about 8–10 hours. The downside is refilling tanks, and in very strong wind they can blow out (better models include a thermocouple that shuts off the gas automatically if that happens). For open patios with no gas line and no 240V power, propane is usually the default best choice.

Natural Gas

Natural gas heaters are essentially the permanent, never-run-out version of propane. They put out up to 50,000–58,000 BTU and cost significantly less per hour to run once you factor out the installation cost of running a gas line. If you already have a gas line near your patio, this is a very strong option. If you don't, you're looking at a plumber and permit, which can run $500–$2,000+ depending on your situation.

Electric Infrared

Wall-mounted or ceiling-mounted electric infrared heaters top out around 6,000W (roughly 20,000 BTU equivalent), which is less raw output than a big gas heater, but they convert nearly 100% of electricity into radiant heat with zero combustion. They're silent, instant-on, and produce no combustion gases, which is a big deal if your patio is covered or semi-enclosed. The catch is electricity cost, which varies wildly by state (as low as 8 cents/kWh in some states and over 35 cents/kWh in Hawaii as of 2025 EIA data), plus you need a suitable electrical circuit.

Pellet Heaters

Pellet patio heaters have a novelty appeal and produce a visible flame effect some people love, but they come with real limitations outdoors. You're supposed to suspend use during strong wind or thunderstorms, pellet feeding can clog or jam, and the heat output is lower than gas. For most people, pellets are a supplemental or aesthetic choice, not a primary patio heating solution.

Quick comparison

Sizing Heat Output for Your Patio Space

For outdoor radiant heating, you're not trying to heat an air volume like you would indoors. You're trying to create a warm zone where people are sitting. A single freestanding propane heater at ~40,000 BTU can comfortably warm a radius of about 8–12 feet under calm conditions. A mounted electric infrared unit at 3,000–4,000W covers roughly a 6x8 ft seating area well. The rule of thumb I use: one good-sized gas heater per 10–12 ft diameter seating zone, or one mounted electric unit per small table grouping.

Wind and ambient temperature cut into that coverage significantly. If your patio is exposed, plan conservatively and go up a size. For a 200 sq ft open patio in a cold climate, two 40,000 BTU gas heaters positioned at either end will outperform one 50,000 BTU unit in the center when wind is involved. For covered patios in the 100–150 sq ft range, two mounted electric infrared units at 3,000W each are usually enough to keep a dinner party comfortable down to about 40°F.

If you want to do a quick calculation: take your seating area square footage, multiply by 25–35 BTU per sq ft for mild climates or 35–50 BTU per sq ft for colder or windier ones, and that gives you a starting target. For a 150 sq ft patio in a cold climate, that's 150 x 40 = 6,000W or roughly 20,000 BTU of radiant output as a floor, not a ceiling.

What Works Best for Your Patio Setup

Covered patios

A covered patio is the best environment for electric infrared heaters. For a quick recommendation, check out the best covered patio heater options for electric infrared and other covered-patio setups. The roof keeps heat from dispersing straight up, so radiant warmth reflects and bounces within the space. Mounted units at 7–9 ft above the seating area work extremely well here. For gas heaters under a covered patio, CO risk becomes a real concern: the general industry rule is that a covered space only counts as adequately ventilated if at least 50% of the total wall area is open to the atmosphere. If your covered patio is more enclosed than that, stick with electric infrared and avoid combustion heaters. There's more detail on the specific best heaters for covered patios in the covered patio heater section of this site, and if you're comparing covered versus open patio setups, the guide on the best way to heat a covered patio goes deeper on that distinction.

Open-air patios

Open patios favor higher-output gas heaters simply because you need the extra BTUs to compensate for heat loss to the open sky and wind. Freestanding propane towers are flexible since you can reposition them as needed. Natural gas wall-mount or post-mount heaters work well on an open patio with a fence or wall on at least one side. For fully exposed open patios, wind is the biggest variable: even a 40,000 BTU heater loses significant effective output in a consistent 10+ mph breeze. The best heaters for open patios section of this site covers specific product picks for that scenario.

Screened-in patios and porches

Screened enclosures fall somewhere in between. They block most wind, which helps a lot, but screening is still semi-open so combustion gas generally disperses safely. Electric infrared is still the cleanest choice here, but a properly sized propane heater can work too. If you’re trying to pick the best patio heater for a screened porch, the decision usually comes down to whether you prefer clean radiant electric heat or a properly sized propane unit best patio heater for screened porch. For more specifics on choosing the right unit for screened-in patios, review the best heater for screened in patio recommendations in the covered patio heater section. If you're specifically dealing with a screened porch or enclosed screened patio, those setups have their own considerations covered in more detail elsewhere on this site.

Seating layout matters

Zone heating is the right mental model: you're not heating the whole patio, you're heating the areas where people are sitting. Place heaters at the perimeter of a seating cluster rather than the center of the whole patio. For a U-shaped or L-shaped seating arrangement, two smaller heaters flanking the group will outperform one large unit set back from everyone. For a long dining table, a mounted overhead infrared unit running the length of the table beats any freestanding heater placed at one end.

How to Actually Set Up and Place Your Heaters

1. Identify your seating zones first, not just your patio perimeter. Mark out where chairs and tables actually sit, and plan heater placement around those spots.
2. For freestanding propane heaters, position them at the edge of the seating zone rather than in the center. Aim the mushroom-cap reflector inward toward people. Keep them on a level, stable surface and never move them while they're running.
3. For mounted electric infrared units, mount at 7–9 ft above the finished floor (the Detroit Radiant design guide recommends a minimum of 6.5 ft above finished floor for outdoor applications, with 8 ft preferred in some configurations). Angle the unit slightly toward the seating area for maximum direct radiant reach.
4. Maintain manufacturer-required clearances from combustibles. Infratech's W-series, for example, specifies at least 18 inches from adjacent walls on the sides, with 36 inches of clearance in front of the heating element. Always check your specific model's manual.
5. If you have wind exposure, position heaters on the windward side of the seating area so heat blows toward people rather than away. Add a windscreen, pergola panel, or planter wall as a physical break even a modest barrier makes a measurable difference.
6. For tabletop or pedestal heaters used near a dining table, the sweet spot is 30–48 inches above the table surface for radiant reach without overheating the food or people directly beneath.
7. Test your setup at a cool evening before committing to placement. Run the heater for 15 minutes, sit in every seat, and identify cold spots. Move heaters or add a second unit as needed.

Heating Your Patio in Winter

Winter patio heating is a different challenge than mild-weather use. Below 35–40°F, gas heaters perform roughly the same (combustion output doesn't change much with ambient temperature), but convective heat loss becomes brutal in cold, dry air. Electric infrared heaters are less affected by cold air because they don't heat the air at all, they heat you directly, which is why a 3,000W electric unit can feel adequate at 30°F when a similarly rated gas unit feels underwhelming.

For winter use specifically, here's what actually improves performance beyond just cranking up the BTUs:

• Add a wind barrier on the exposed sides. A canvas screen, glass panel, or even a heavy planter row cuts convective heat loss dramatically. Wind is the largest single variable affecting outdoor heater comfort.
• Preheat the seating area 10–15 minutes before guests arrive. Radiant heaters warm surfaces (furniture, flooring) as well as people, and warm surfaces radiate back, making the zone feel noticeably warmer.
• Layer heaters rather than relying on one large unit. Two 30,000 BTU heaters positioned on opposite sides of a seating group create overlapping radiant zones that feel noticeably warmer than a single 60,000 BTU unit placed in the middle.
• Use outdoor area rugs and cushions. Radiant heat warms surfaces, and warm surfaces under and around seated people substantially improve comfort.
• For pellet heaters, winter use is especially limited: the operational guidelines explicitly state to suspend use during strong wind or thunderstorms, which describes many winter evenings.

In very cold climates (below 25°F), no patio heater on the market makes a fully open patio feel like indoors. Manage expectations: you're buying comfort within a few degrees, not tropical warmth. A covered or semi-enclosed patio with wind barriers and two properly sized heaters can realistically stay 15–25°F warmer than ambient. An open exposed patio will be harder to push past a 10–15°F lift in a sustained wind.

What It Actually Costs to Run Each Type

Running costs are where a lot of people get surprised. Here's a honest breakdown based on current 2025–2026 fuel and electricity pricing:

If you're in a low-electricity-rate state (under 12 cents/kWh), electric infrared can actually beat propane on running cost while being cleaner and easier to maintain. If you're paying 20+ cents/kWh, propane or natural gas is usually cheaper per hour. For a rough personal estimate: multiply your heater's wattage by your local cents/kWh rate and divide by 100. A 4,000W heater at 15 cents/kWh costs about 60 cents per hour to run.

Maintenance costs are real too. Propane heaters need annual cleaning of the burner and thermocouple, and the thermocouple (the safety device that shuts off gas if the flame blows out) eventually needs replacing, typically every few years. Natural gas setups need a periodic inspection of the gas line connection. Electric infrared units are essentially zero maintenance other than keeping the emitter clean and checking wire connections annually.

Safety and Installation Basics

This is the section people skim and then regret skipping. A few non-negotiables:

For all gas heaters (propane and natural gas)

• Never use gas-combustion heaters in a space that doesn't meet the 50% open wall area standard for outdoor classification. If less than half the perimeter wall area is open to the atmosphere, you risk CO accumulation, even with a small overhang or roof.
• Keep propane cylinders upright and on a level surface at all times. Never relocate a running heater.
• Make sure your heater has a thermocouple or ODS (oxygen depletion sensor). These shut off the gas if the flame is extinguished by wind or if oxygen drops too low. This is a baseline safety feature, not a premium add-on.
• For natural gas installations, always use a licensed plumber and pull the required permit. Check local codes before installation.

For electric infrared heaters

• Use only heaters with an IP (ingress protection) rating appropriate for outdoor use. IP55 or higher is the baseline for most outdoor applications; IP65 for wetter climates.
• All outdoor electrical connections must be on a GFCI-protected circuit. This is code in most jurisdictions and is non-negotiable near moisture.
• Respect minimum clearance distances. Infratech's W-series, for example, requires at least 18 inches clearance from adjacent walls on the sides, and 36 inches in front of the emitter face. Radiant heat directed at a wood beam or vinyl siding too close will cause damage over time.
• Don't mount directly above flammable materials, outdoor rugs, or fabric furniture. Any object stored or left under a radiant heater is subject to heat exposure even when you think the angle is safe.

General rules for all types

• Install at a minimum of 6.5 feet above the finished floor in outdoor applications, with 8 feet preferred for high-traffic areas where people might stand and move around under the heater.
• Never leave a running heater unattended for extended periods, especially with children or pets present.
• Check your local fire code and HOA rules before installing any permanent gas or hardwired electric patio heater.
• For pellet heaters, always follow the manufacturer's suspension guidelines: shut down during strong wind and never use in a thunderstorm.

The Bottom Line: Which Setup Is Right for You

If you take one thing from this guide, it's this: match the heater type to your patio's structure and your fuel access first, then size it correctly for your actual seating zone rather than the total patio square footage. A covered patio with electrical access is the ideal environment for electric infrared, and it's worth the installation investment. An open patio with no gas line points directly to propane. An existing gas line makes natural gas the obvious long-term winner on cost and convenience. Whatever you choose, use two smaller heaters flanking your seating zone rather than one oversized unit at the edge, add a wind barrier if you're in an exposed location, and always check clearances before you mount anything.