Patio heaters do work, but how well depends on the type, fuel, and your setup
A patio heater will warm the space around it, but not in the way a furnace warms a house. Patio heaters radiate heat outward in a cone or circle rather than heating the air evenly. This means you feel warmth when you're in front of or near the heater, but the effect drops sharply as you move away. On a calm evening, you can sit comfortably 6 to 10 feet from a working heater. Wind, outdoor temperature, and the heater's fuel type all change how well it performs.
The three common types—propane, natural gas, and electric—work on different principles and have different ranges. Propane and natural gas heaters use an open flame or glowing element to emit infrared radiation. Electric heaters use a heating coil or halogen bulb to do the same. None of them heat the air itself significantly; they heat objects and people in their path, which is why you feel warm even on a cold night.
Key Takeaways
- Patio heaters radiate heat outward rather than warming the entire space, so you need to be within 6 to 10 feet to feel real warmth.
- Propane heaters are portable and powerful but require refilling and produce carbon monoxide, so they should not be used indoors or in enclosed spaces.
- Natural gas heaters are permanent installations that don't need refilling, but they require a gas line run to your patio.
- Electric heaters are safe indoors and on covered patios but use more electricity and have a shorter effective range than gas heaters.
- Wind, humidity, and outdoor temperature all reduce how far the heat travels, so a heater rated for 10 feet may only work well at 6 feet on a breezy night.
How propane heaters radiate heat
Propane heaters burn fuel in a combustion chamber and direct the heat upward through a metal reflector. The reflector bounces infrared radiation downward and outward in a cone shape. Most propane heaters stand on a weighted base with a propane tank underneath, making them portable—you can move them around your patio or store them in winter.
A standard propane heater uses a 20-pound tank and can run for 8 to 10 hours on a full tank, depending on the heat setting. The effective range is usually 10 to 15 feet on a still night, though wind cuts this in half. Propane heaters produce carbon monoxide as a byproduct of combustion, so they must never be used indoors, in a garage, or in any fully enclosed space. A covered patio with open sides is safe; a screened room is not.
Propane heaters are the most affordable option upfront—models range from $150 to $400—and they work on any patio without needing installation. The trade-off is that you have to buy and swap propane tanks regularly, and the heater takes up floor space.
How natural gas heaters work differently
Natural gas heaters operate on the same infrared principle as propane but draw fuel from a permanent gas line connected to your home. This means no tanks to refill, no storage, and consistent fuel supply. The heater itself is usually mounted on a pole or wall and stays in one place.
Installation requires running a gas line to your patio, which typically costs $300 to $800 depending on distance and whether the line already exists nearby. Once installed, a natural gas heater is cheaper to run than propane over time because natural gas rates are usually lower. The effective range is similar to propane—10 to 15 feet—but the heater produces the same carbon monoxide, so it still needs open air or a covered space with ventilation.
Natural gas heaters are a good choice if you already have a gas grill or outdoor kitchen and want a permanent heating solution. They're not portable, so you're committing to one location.
Electric heaters and their limitations
Electric patio heaters use a heating element—either a coil or a halogen bulb—to produce infrared radiation. They plug into a standard outlet or a dedicated circuit and have no combustion, so they produce no carbon monoxide and are safe to use indoors, on covered patios, or in screened rooms. This makes them the safest option for enclosed spaces.
The downside is range and power. Most electric heaters have an effective range of 4 to 8 feet, shorter than gas heaters. They also draw significant electricity—a typical model uses 1,500 to 2,000 watts—which can raise your electric bill noticeably if you use it several hours a day. A 1,500-watt heater running for four hours costs roughly $0.50 to $1.00 per day depending on your local electricity rate.
Electric heaters are best for small patios, covered spaces, or situations where you need a heater that's safe around children and pets. They're also quieter and require no maintenance beyond occasional cleaning of the heating element.
Wind, temperature, and distance reduce heater effectiveness
A patio heater's rated range assumes calm conditions and mild cold—roughly 50°F or warmer. In real conditions, several factors shrink the effective distance. Wind is the biggest culprit: even a gentle 5 mph breeze can cut the heater's range by half because it disperses the infrared radiation. On a windy night, you may need to sit only 4 to 5 feet away to feel warmth from a heater rated for 10 feet.
Outdoor temperature also matters. At 40°F, a heater works well at its rated distance. At 20°F, you'll feel the warmth only if you're closer. Humidity doesn't stop infrared radiation, but very cold, dry air can make you feel colder even when the heater is working, because your skin loses moisture faster.
The size and material of your patio affect performance too. A heater on a dark stone patio radiates heat into the stone, which then radiates it back to you—a small bonus. On a light-colored or reflective surface, more heat bounces away. Overhead structures like pergolas or umbrellas don't block infrared radiation the way they block sunlight, so they don't reduce heater effectiveness.
Comparing the three types side by side
| Type | Upfront Cost | Effective Range | Fuel Cost | Installation | Safety Notes |
|---|---|---|---|---|---|
| Propane | $150–$400 | 10–15 feet | $15–$25 per refill | None; portable | Produces CO; needs open air |
| Natural Gas | $400–$1,200 | 10–15 feet | Lower per hour than propane | $300–$800 for gas line | Produces CO; needs open air |
| Electric | $100–$300 | 4–8 feet | $0.50–$1.00 per 4-hour use | None; plug and play | Safe indoors; high electricity use |
Tips for getting the most heat from your patio heater
Position the heater where it's sheltered from wind but not blocked by walls or dense structures. A corner of your patio or an area with a pergola overhead works well. Sit within 6 to 8 feet of the heater rather than at the edge of its rated range—you'll feel noticeably warmer and the heater will work less hard.
For propane heaters, keep the tank in a warm spot before use; cold propane doesn't vaporize as easily, so the heater may not reach full power. Store tanks upright and away from direct sunlight. For electric heaters, make sure the outlet is rated for outdoor use (marked with a "W" for wet location) and use a ground fault circuit interrupter (GFCI) outlet to prevent electrical hazards.
If you're using a gas heater on a very cold night, run it for 10 to 15 minutes before you sit down to let the reflector warm up. This improves heat output. On mild evenings—60°F or warmer—you may not need the heater at all; a blanket or fire pit often works just as well and uses less fuel.
Frequently Asked Questions
Can I use a propane patio heater in a screened porch?
No. A screened porch is considered an enclosed space, and propane heaters produce carbon monoxide, which can accumulate and become dangerous. Use only electric heaters in screened areas, or use a propane heater only on open patios with at least two sides fully exposed to outside air.
How long does a propane tank last?
A standard 20-pound propane tank lasts 8 to 10 hours on high heat and 15 to 20 hours on low heat. The exact time depends on the heater model and how high you set the flame. Most people refill tanks every 2 to 4 weeks during regular patio season.
Do patio heaters work on very cold nights?
Yes, but less effectively. On nights below 30°F, the heater's range shrinks to 4 to 6 feet instead of 10 feet. Propane heaters may also struggle to ignite in extreme cold because the fuel doesn't vaporize easily. Electric heaters work fine in cold but use more electricity to produce the same warmth.
Is it cheaper to run a natural gas heater or a propane heater?
Natural gas is usually cheaper per hour once the heater is installed, but you pay $300 to $800 upfront for the gas line. If you plan to use the heater for many seasons, natural gas saves money. For occasional use or a rental property, propane is cheaper overall because there's no installation cost.
Can I leave a patio heater on unattended?
Propane and natural gas heaters should not be left running unattended for long periods. Most models have an automatic shutoff if they tip over, but it's safer to turn them off when you step inside. Electric heaters are safer to leave on briefly, but it's still good practice to turn off any heater when you're not using it.