Electric vs Propane Patio Heater: Which Is Better for Your Backyard?

You’re staring at two patio heaters — one electric, one propane — and you want the honest answer: in the electric vs propane patio heater debate, which is better? Both promise warm evenings outside, but they warm you in completely different ways. Pick the wrong one and you end up with a chilly gathering, or money burned for heat you never feel.

This comparison puts both types side by side on the things that actually matter: heat output and coverage, real running costs, setup and convenience, safety, and how they behave in wind. By the end, you won’t need a coin flip — you’ll know which type fits your space, your habits, and your budget.

A quick safety note before we start: propane heaters burn fuel, so they produce carbon monoxide and need open ventilation — never run one in an enclosed space. Electric heaters produce no fumes, but they draw serious power, so use outdoor-rated outlets and cords and keep all connections dry.

The tiebreaker: propane brings raw heat for big open spaces; electric brings cheap, silent, fume-free warmth for smaller or covered spots.

Heat Output and Coverage: Propane Has the Muscle

Freestanding propane patio heaters typically produce 40,000 to 48,000 BTU per hour — that is restaurant-patio levels of heat. Electric infrared patio heaters usually run 1,500 to 6,000 watts, and a common 1,500-watt model makes about 5,100 BTU.

In practice, propane throws warmth across a wide circle, so a group of six or eight can all feel it. Electric infrared works differently: its rays travel in straight lines and warm people and objects directly, so you feel it most when you sit in its path, inside a smaller zone.

Neither type heats the air much — outdoors, warm air rises and drifts away. That is why coverage depends on radiant reach, not room size. If your space is big and open, measure it first — our guide on how to choose a patio heater walks through matching heater size to square footage.

Electric vs Propane Patio Heater: What It Costs to Run

Here is the honest math. A 1,500-watt electric heater at typical US electricity rates costs roughly $0.20 to $0.60 per hour to run. A 40,000 BTU propane heater costs roughly $1.50 to $3.00 per hour, depending on local propane prices. Your rates will move these numbers, so treat them as ballpark figures.

Propane looks pricey per hour — until you remember it delivers roughly eight times the heat. On a cost-per-unit-of-warmth basis, the two are closer than the hourly numbers suggest. You are paying for output, not waste.

On fuel logistics: a 20-pound propane tank holds about 4.6 gallons, and a full-power heater burns roughly 0.4 gallons per hour — so expect around 10 to 12 hours of heat per tank on high. When the tank runs dry mid-evening, the party pauses for a tank swap. See our breakdown of how long a propane tank lasts on a patio heater for the full math.

Up front, both types usually land in the same ballpark — roughly $100 to $400 — with electric models tending to cost a bit less on average.

Convenience and Setup

Electric wins on day-to-day ease. You mount it or set it down, plug it in, and flip a switch — silent, instant, and nothing to refill. Wall and ceiling mounts also keep it out of the way on small patios.

Propane wins on placement freedom. It rolls anywhere with no outlet in sight, which makes it the pick for open lawns, poolside setups, and rented event spaces. The tradeoff is tank duty: watching the fuel level, hauling tanks for refills or exchanges, and storing spares.

One caution for electric: heater cords are thick for a reason. If you must cross a distance, use a short, heavy-gauge, outdoor-rated extension cord — and plug the heater in directly whenever you can. For a refresher on safe startup and shutdown, see how to use a patio heater.

Safety: Read This Before You Decide

This is where the two types split hardest. Propane heaters burn fuel, which means an open flame and carbon monoxide. They belong outdoors with open ventilation and proper clearance above and around them — never in a garage, tent, or enclosed porch.

Electric infrared heaters produce no fumes and no flame, which makes them the safer pick under covered patios, on balconies, and around kids and pets. They still get hot enough to burn skin, so keep the clearances your manual requires.

With electrics, water and power do not mix: use only outdoor-rated models outside, keep plugs and connections dry, and unplug before cleaning. Wondering about indoor use at all? Read can you use a patio heater indoors — the short answer is that fuel-burning heaters are a no.

Wind and Cold Weather Performance

Wind is the enemy of every patio heater. Moving air strips radiant warmth away, and no heater type is immune. The difference is headroom: propane’s much larger output still reaches you in a breeze, while a small electric unit can feel weak once the wind picks up.

Electric infrared has one structural quirk: its heat travels in straight lines. If you shift your chair out of the heater’s beam, you lose the warmth. Sitting in the heater’s direct path matters more with electric than with propane.

Cheap fixes help both types: windbreak screens, seating placed close together, and putting the heater on the windward side so warmth drifts toward people. In real cold, propane’s extra BTUs buy you more usable evenings — a 1,500-watt electric unit only warms people sitting close.

Environmental Impact

Propane burns a fossil fuel, so it releases carbon dioxide right where you sit. Electric heaters release nothing on site — but their footprint depends on how your local grid makes electricity.

There is no green hero here. If lower emissions matter to you, the honest lever is using less heat: right-size the heater, add windbreaks, and skip the giant propane mushroom for a two-person evening.

Lifespan and Maintenance

Both types last longest with the same care: a fitted cover, storage out of driving rain in the off-season, and a wipe-down before first use each year. Rust is the main killer of steel heater bodies, electric or propane.

Propane adds burner and pilot maintenance — spiders love pilot tubes, and a yearly cleaning keeps ignition reliable. Electric adds element wear; infrared tubes dim over time and eventually need replacement. Store propane tanks outdoors, upright, and never inside your home.

The Verdict: Which Should You Buy?

There is no universal winner — there is a winner for your situation. A big open space with no outlet means propane, no contest; a covered porch or balcony means electric, no contest. Match the heater to the space, not the hype.

Mistakes to Avoid

Frequently Asked Questions

Which is cheaper to run: an electric or propane patio heater?

Electric is cheaper per hour – typically $0.20 to $0.60 for a 1,500-watt heater versus $1.50 to $3.00 for a 40,000 BTU propane heater. The catch: propane delivers roughly eight times the heat, so the cost per unit of warmth is closer than the hourly numbers suggest.

Do electric patio heaters put out as much heat as propane?

No. A 1,500-watt electric heater produces about 5,100 BTU, while a freestanding propane heater typically puts out 40,000 to 48,000 BTU. Electric infrared warms people directly in a smaller zone; propane heats a wide area around the unit.

Can I use a propane patio heater under a covered patio?

Only with generous overhead clearance and open ventilation – propane produces carbon monoxide and must never be used in an enclosed space. For covered patios, porches, and balconies, an electric infrared heater is the safer choice.

Which patio heater is better for a balcony?

Electric. It has no open flame, no fuel tank, and no fumes – and many apartment leases and local fire codes ban propane heaters on balconies. Always check your building’s rules before buying.

How long does a 20-pound propane tank last on a patio heater?

Roughly 10 to 12 hours on high for a typical 40,000 BTU heater, since it burns about 0.4 gallons per hour and a full 20-pound tank holds around 4.6 gallons. Running the heater on a lower setting stretches that further.

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The Bottom Line

In the electric vs propane patio heater debate, propane brings the muscle and electric brings the manners. Now you know what each one costs, how each one heats, and where each one is safe.

Your next move: measure your space and check your outlets, then buy once and buy right. Warm evenings are waiting.