How much does it cost to run a outdoor electric patio heater?
Outdoor electric patio heaters are among the most power-hungry portable appliances for home entertainment, drawing significant electricity to generate radiant heat in open air where much of it disperses. Their high wattage reflects the thermodynamic challenge of warming large outdoor spaces that are naturally ventilated and exposed to ambient temperature, wind, and heat loss. Understanding how a heater's size, element type, and usage patterns affect running costs helps you choose a model matched to your needs and avoid oversizing.
Outdoor Electric Patio Heater running cost calculator
- Per day
- $1.02
- Per month
- $15.30
- Per year
- $183.60
- CO₂ / year
- 432 kg
Based on 1080 kWh per year. Adjust the price per kWh to match your latest electricity bill for an exact figure.
At 1500 watts used 4 hours a day, a outdoor electric patio heater costs about $1.02 per day, $15.30 per month and $183.60 per year on an average rate of 17¢ per kWh — roughly 1080 kWh and 432 kg of CO₂ over a year. Enter your own electricity rate and usage in the calculator above for a figure matched to your bill.
Electric patio heaters rely on resistance heating elements—typically quartz or metal coils—that convert electrical current directly into infrared radiation rather than heating air. This means they work differently than indoor central heating: instead of raising the ambient temperature of a whole space, they create zones of radiant warmth that feel effective to people nearby, even if the overall air temperature remains cool. The radiant approach is efficient in principle, but the open-air environment means a large portion of that heat energy escapes into the night sky, making the appliance draw substantial power for only localized comfort. Most units are rated between 1,000 and 2,000 watts, with tabletop models at the lower end and standing or wall-mounted types higher up the range.
The actual energy consumption depends heavily on real-world usage patterns and settings. Many heaters have adjustable power settings—typically low, medium, and high—allowing you to dial down consumption if you're only creating warmth for a small gathering or mild evening. Operating at 50% power can meaningfully reduce both energy draw and running costs compared to full blast, yet the difference in perceived warmth is often minimal if people are seated nearby. Frequency of use also matters: casual weekend entertaining generates very different cumulative costs than nightly use throughout an outdoor season, and geographic location determines how many months per year a heater is practical or necessary.
When selecting a heater, matching the wattage to your space and use case prevents unnecessary expense. A 1,500-watt unit works well for a small patio seating 4–6 people or a corner of a larger deck, while larger gatherings or open areas may benefit from two smaller heaters positioned strategically rather than one maximum-power model running constantly. Wall-mounted or overhead heaters often distribute warmth more evenly than tabletop types and can cover larger seating areas without a bulky stand. Infrared quartz heaters typically offer superior radiant efficiency and faster warm-up compared to cheaper wire-element designs, making them a better long-term value despite higher upfront cost.
Common usage mistakes that inflate operating costs include running heaters on high power at the start of the evening to speed warm-up—a practice that wastes energy because radiant heaters reach full effectiveness within minutes. Positioning a heater far from where people actually sit, aiming it at empty space, or leaving it running after guests depart also inflate consumption. Smart scheduling and placement matter: turning on a heater just before people sit down, targeting seating zones, and switching to a lower setting once the space feels warm can cut runtime and power draw without sacrificing comfort. Weatherproofing the storage area and checking heater covers for damage at season start ensures the element isn't working harder due to moisture or corrosion.
Environmental and building considerations also shape running costs. Sheltered patios next to the house or partially enclosed by plants or screens experience less wind loss and keep radiant heat in closer proximity to people, allowing you to use lower power settings and run for shorter periods. By contrast, exposed decks or pool areas at the edge of yards lose heat quickly and may require higher settings to maintain comfort. In mild climates with only occasional cool evenings, a single on-demand heater might be all you need, while harsh winters or frequent entertaining justifies a larger, more efficient unit placed to serve multiple seating zones.
Frequently asked questions
- Why do electric patio heaters use so much more power than an indoor space heater?
- Patio heaters are designed to emit radiant infrared heat into open air where much of it simply escapes upward and outward, with no insulation or walls to contain warmth. An indoor space heater heats a finite, partially enclosed room where heat accumulates and stays within the space. The outdoor heater must continuously output high power to maintain a comfortable radiant field around people, whereas an indoor room gradually warms up and retains that heat.
- Should I always run my patio heater on high power, or does low/medium setting really save money?
- Low and medium settings substantially reduce energy consumption and running costs. Most people sitting within 8–10 feet of a heater feel adequate warmth at medium or even low power; high is best reserved for very cold nights, large groups, or when you want to warm up the space quickly. Running at medium instead of high cuts both instantaneous power draw and session duration, often by 30–40%, with minimal loss of comfort if the heater is aimed at your seating area.
- What type of heating element is most efficient—quartz, carbon, or wire-coil?
- Quartz and carbon-fiber infrared elements are more efficient and deliver more radiant output per watt than basic wire-coil designs. They heat up faster, produce more concentrated radiant heat, and maintain consistent output over time. Wire-coil heaters are cheaper upfront but are slower to warm, less focused in their heat distribution, and can lose efficiency as the element ages. For regular use, an infrared quartz heater offers better value over its lifetime.
- If I use my patio heater only on weekends or a few times per month, does that significantly reduce the running cost?
- Yes, greatly. The figures above are based on a typical usage pattern; if you use your heater only occasionally rather than regularly, total running costs will be proportionally lower. A heater run 4 hours a week instead of 4 hours most days will cost roughly one-quarter as much per year. Seasonal use also matters—a heater run only May through September costs far less annually than year-round use in a cold climate.
- Does the heater's physical size or brand affect power consumption?
- The wattage rating, not the physical size or brand, determines power draw. A sleek, designer 1,500-watt heater consumes exactly the same electricity as a basic 1,500-watt model. Some premium brands may offer better durability, faster heating, or more even radiant spread, but those are quality factors, not efficiency factors. Always check the wattage spec when comparing units if energy cost is a concern.
- Can I lower my running costs by using the heater in a sheltered or partially enclosed area?
- Yes. A heater on a sheltered patio with windbreaks or near walls loses less radiant heat to air movement and can achieve the same comfort level at lower power settings or with shorter runtime. A heater in fully open, windy conditions requires higher settings and longer use to maintain comfort. Positioning your heater wisely and creating a semi-sheltered seating zone is one of the few ways to reduce effective running costs without changing the unit itself.