Propane vs. Electric Patio Heaters: Mushroom vs. Infrared vs. Tabletop, and How Much Heat a Patio Needs

A patio heater can stretch outdoor season by months, but the wrong one leaves guests huddled around a glowing tube while the heat blows away. The choice comes down to fuel (propane, natural gas or electric), how the heater delivers warmth (warming the air versus radiant infrared that warms people directly), and whether it is portable or permanently mounted. Numbers help: comparing watts and BTUs on the same scale makes it obvious why a plug-in electric heater and a tall propane tower are not the same class of product.

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Quick verdict

• Most heat for an open patio, no wiring: a full-size propane mushroom heater such as the Amazon Basics 46,000 BTU patio heater, which runs on a standard 20-pound tank.
• Covered patio or porch with an outlet: a wall- or ceiling-mounted electric infrared heater like the Dr Infrared DR-238, a 1,500-watt, 120-volt unit with three heat settings.
• More electric heat for a larger covered space: the 240-volt, 3,000-watt Dr Infrared DR-239, which needs a matching 240-volt circuit.
• Ambience at a small table: a tabletop pyramid flame heater like the Hiland HLDS032-GTTSS, about 10,000 BTU on a 1-pound cylinder. It looks great and warms a couple of people nearby, not a whole patio.

Watts vs. BTUs: putting heaters on the same scale

Gas heaters are rated in BTUs per hour and electric heaters in watts. The U.S. Energy Information Administration lists 3,412 BTUs per kilowatt-hour of electricity and about 91,500 BTUs per gallon of propane, which makes the conversion simple:

• A 1,500-watt plug-in electric heater produces about 5,100 BTUs per hour.
• A 3,000-watt, 240-volt electric heater produces about 10,200 BTUs per hour.
• A tall propane mushroom heater at 46,000 BTUs per hour puts out roughly nine times the energy of a 1,500-watt heater.

Raw output is not the whole story, because electric infrared heaters aim their energy at people and surfaces, while much of a propane tower's heat rises and drifts away in open air. Still, the gap explains why a single plug-in heater suits a covered nook or a couple of chairs, while an open patio party needs gas or several hardwired electric units.

Infrared vs. convective heat

Radiant infrared heaters warm the people, furniture and floor in their line of sight, much like sunlight. Because they don't depend on warming the air, they hold up better in a breeze. Most electric patio heaters are infrared, and so are the reflector-topped mushroom heaters, though those also lose a lot of heat upward. Heaters that mainly warm the air work best in enclosed or screened spaces; in the open, wind carries that warm air off almost immediately. For patios that are open on several sides, infrared is the more efficient choice.

Spec comparison

Heater	Shop	Fuel / power	Output	Install	Best for
Amazon Basics 46,000 BTU	Buy on Amazon	Propane, 20 lb tank	46,000 BTU/hr	Freestanding, wheels	Open patios, gatherings
Dr Infrared DR-238	Buy on Amazon	Electric, 120V	900 / 1,200 / 1,500 W (about 5,100 BTU/hr max)	Wall or ceiling mount, plug-in	Covered patios, porches, small groups
Dr Infrared DR-239	Buy on Amazon	Electric, 240V plug	3,000 W (about 10,200 BTU/hr)	Wall or ceiling mount, 240V outlet	Larger covered spaces
Hiland HLDS032-GTTSS	Buy on Amazon	Propane, 1 lb cylinder	About 10,000 BTU/hr	Tabletop	Ambience, one or two seats

The picks in detail

Amazon Basics 46,000 BTU propane heater

Amazon Basics 46,000 BTU Patio HeaterCheck today’s price on AmazonBuy on Amazon →

This is the classic mushroom-style tower: a burner under a wide reflector cap on a pole, with a 20-pound propane tank hidden in the base and wheels for moving it. It is rated at 46,000 BTUs per hour with an adjustable output knob, and Amazon lists a heating radius of about 9 feet. The appeal is simple: lots of heat anywhere on a patio, no electrician, and refills at any tank exchange. Using the EIA figure, a full 20-pound tank (about 4.7 gallons) holds roughly 430,000 BTUs, which works out to around nine hours on high and longer at lower settings. Expect to secure it against wind and check that the unit has a tip-over shut-off before use.

Dr Infrared DR-238: the plug-in electric

Dr Infrared DR-238Check today’s price on AmazonBuy on Amazon →

The DR-238 is a carbon infrared heater that runs on an ordinary 120-volt outlet with 900-, 1,200- and 1,500-watt settings and a remote. It is IP55-rated for outdoor use and mounts to a wall or ceiling, out of the way of foot traffic. There is no flame, fuel or exhaust, and it warms people almost instantly. The limit is output: around 5,100 BTUs per hour at full power warms a seating area or a couple of chairs under a roof, not a wide-open deck. A 1,500-watt heater also uses most of a standard 15-amp circuit, so it should not share that circuit with other big loads.

Dr Infrared DR-239: twice the electric heat

Dr Infrared DR-239Check today’s price on AmazonBuy on Amazon →

The DR-239 doubles the output to 3,000 watts, about 10,200 BTUs per hour, by running on 240 volts. Its cord uses a NEMA 6-15 plug, so most homes need an electrician to add a matching 240-volt outdoor receptacle on its own circuit. It is also IP55-rated and mounts on a wall or ceiling. For larger covered patios, several of these spaced along the seating area give even, quiet heat. Larger permanent installations can add up to a lot of amperage, so it is worth confirming panel capacity before planning multiple heaters.

Hiland tabletop pyramid heater: flame for the table

The Hiland HLDS032-GTTSS is a 39-inch tabletop version of the glass-tube pyramid heaters seen at restaurants, rated around 10,000 BTUs and fueled by a 1-pound propane cylinder. The dancing flame in the quartz tube is the main attraction. Glass-tube designs send a lot of their heat upward, so treat it as ambience plus a little warmth for the people sitting closest. Full-size pyramid heaters in the 40,000-BTU range exist too, but they generally warm less effectively than a mushroom-style heater of similar output.

How much heat does a patio need?

Square footage alone is a poor guide. The factors that matter most:

• Mounting height. The higher an electric heater is mounted, the more powerful it needs to be to feel warm at seat level. Follow the manufacturer's minimum clearances and recommended mounting heights.
• Enclosure. A covered patio with a wall or two holds heat far better than an open deck. Drop-down screens or windbreaks make any heater more effective.
• Wind. Wind strips heated air away quickly. Infrared handles it best, but windy sites still need more heat than calm ones.
• Temperature. Heaters work below freezing, but comfort drops fast in open air. In cold climates, plan more output than seems necessary. Undersizing is the most common complaint, while an oversized heater can simply be turned down.

Safety and placement

• Propane heaters are outdoor-only. They produce carbon monoxide and must never be used in a garage, tent, enclosed porch or any closed space.
• Clearances. Keep flame heaters well away from umbrellas, awnings, siding, branches and furniture, using the distances in the owner's manual.
• Stability. Set freestanding heaters on level ground, anchor them in wind, and choose models with a tip-over shut-off.
• Propane storage. Store tanks outdoors, upright and away from ignition sources, not in the house or garage, and check connections with soapy water for leaks.
• Electrical. Use outdoor-rated, GFCI-protected outlets, avoid extension cords for high-wattage heaters, and have hardwired or 240-volt units installed by a licensed electrician.

Heat is one piece of a usable outdoor room. A smokeless fire pit adds a gathering point, and these ideas for outdoor spaces that feel like living rooms and budget deck upgrades cover furniture, lighting and layout. For buyers and sellers, a covered patio with built-in heat is one of the outdoor features that makes a backyard feel like extra living space.

Bottom line

For an open patio and the most heat with no wiring, a 46,000-BTU propane mushroom heater remains the practical default. For a covered patio, electric infrared is cleaner, quieter and cheaper to live with: a 1,500-watt plug-in unit for a small area, or 240-volt, 3,000-watt heaters for bigger spaces. Tabletop flame heaters are for atmosphere. Whatever the fuel, size generously and respect clearances.