How much does it cost to run a outdoor electric patio heater?
An outdoor electric patio heater is a high-wattage electric appliance designed to radiate warmth into open or semi-open spaces, making it suitable for use on decks, patios, and outdoor entertainment areas. Because they must heat large volumes of air with minimal insulation, these heaters typically draw significant power during operation, making them one of the more energy-intensive seasonal appliances in most homes.
Outdoor Electric Patio Heater running cost calculator
- Per day
- $0.77
- Per month
- $7.65
- Per year
- $91.80
- CO₂ / year
- 216 kg
Based on 540 kWh per year. Adjust the price per kWh to match your latest electricity bill for an exact figure.
At 1500 watts used 3 hours a day, a outdoor electric patio heater costs about $0.77 per day, $7.65 per month and $91.80 per year on an average rate of 17¢ per kWh — roughly 540 kWh and 216 kg of CO₂ over a year. Enter your own electricity rate and usage in the calculator above for a figure matched to your bill.
The heating mechanism in electric patio heaters relies on resistive heating elements—usually quartz or ceramic tubes—that glow red-hot when electricity passes through them. Unlike indoor heating systems that warm an enclosed, insulated space, patio heaters work by radiating heat directly onto people and objects, which means they lose efficiency quickly as heat dissipates into the open air. The wattage needed to achieve noticeable warmth in an outdoor environment is consequently much higher than what indoor portable heaters require. A typical electric patio heater draws around 1500 watts, meaning it consumes substantial electricity during each hour of use. Many people underestimate how often they actually use these devices; what feels like occasional weekend entertaining can quickly add up to dozens of hours over a season.
When shopping for an outdoor electric patio heater, focus on the heating element technology and coverage pattern rather than wattage alone, since all models targeting the same space typically use similar power draws. Infrared heaters with quartz elements tend to deliver more focused warmth than ceramic models, allowing you to feel the heat even if you're not directly in front of the unit. Consider the size of the area you need to heat: a small patio with four to six people requires far less coverage than an open-air restaurant-style setup. Mounting style matters too—wall-mounted, ceiling-mounted, and freestanding models have different efficiency profiles. A wall-mounted model positioned correctly will heat a more defined area compared to a freestanding tower heater that radiates in all directions, potentially wasting energy by warming empty space or areas you don't occupy.
The seasonal nature of patio heater use is crucial to understanding true running costs. Most owners use these devices only during mild shoulder seasons—late spring and early fall—or occasionally on cool evenings throughout summer. If you live in a climate where outdoor entertaining happens year-round, your annual usage will be higher, but most households deploy these heaters for only a few months. The temptation to leave a heater running continuously while people are outside often exceeds the actual seated time; many users run their heaters before guests arrive and forget to turn them off after people move indoors. Setting a habit of turning off the heater when you leave the space, rather than keeping it on all evening, creates meaningful savings over the season.
Efficiency improvements in electric patio heaters are limited compared to other appliances since the fundamental physics of radiating heat into open air hasn't changed. However, you can optimize consumption by choosing the right model for your specific situation and adjusting how you use it. Oscillating or rotating heaters can seem appealing but actually use the same wattage while spreading heat across a larger, less-focused area—useful if you're hosting a large group but wasteful if you're heating just one or two people. Models with multiple heating elements or settings allow you to run at lower power when full output isn't needed, which can extend the season slightly by making the device comfortable to use even on warmer evenings. Reflective backgrounds or windbreaks around your patio don't reduce the heater's energy draw, but they prevent heated air from blowing away and can make you feel warmer without increasing runtime, effectively improving perceived efficiency.
Frequently asked questions
- Why does my electric patio heater cost so much to run compared to my indoor space heater?
- Indoor space heaters can heat an enclosed room where warm air stays trapped, while outdoor heaters must radiate heat into open air where it disperses immediately. An outdoor heater requires roughly triple the wattage to achieve the same comfort level because most of its energy literally floats away rather than accumulating in a contained space. Additionally, your body needs to be within the direct radiation pattern of an outdoor heater; standing even a few feet away makes a significant difference in perceived warmth.
- Is it more efficient to run one heater constantly or to turn it on and off as needed?
- Turn the heater off when you're not actively using the space. Since these devices don't have a warm-up time and provide immediate radiant heat, there's no efficiency benefit to keeping them running between uses. A heater left running while people are inside, at the end of an evening, or when the sun has warmed up the patio is simply wasting electricity. Make turning off the heater your final outdoor task, not an afterthought.
- Can I use a lower wattage patio heater to save energy, or will it be inadequate?
- Lower-wattage heaters (under 1000W) exist but provide noticeably less warmth and work only for very close seating arrangements or mild weather. A 1500W heater is the practical minimum for heating a typical four-person patio area. Rather than choosing a weaker heater, consider using full-wattage heaters less frequently—turning them on for actual gatherings rather than keeping them running all season.
- What difference does infrared versus ceramic heating elements make to my energy bills?
- Both infrared and ceramic heater elements draw the same wattage and consume the same electricity. The difference is in how the heat is delivered: infrared elements focus warmth more precisely, potentially making you feel warmer at the same power level, while ceramic elements radiate more diffusely. For energy costs, the wattage rating is what matters. Choose based on whether you need focused warmth for a small area or broader coverage for a larger space.
- Does the color or condition of the heating element affect efficiency?
- No. The heating element's color—whether it glows bright red, orange, or dull red—depends on temperature, but efficiency is purely a function of electrical input. A slightly dimmer heater isn't inherently more efficient; it may simply be drawing less power intentionally. Keep heating elements clean of dust and debris to maintain their appearance and ensure proper operation, but this doesn't affect energy consumption—a dirty heater still draws the same wattage as a clean one.
- Should I leave my patio heater plugged in during winter even if I'm not using it?
- No. Unplug the heater and store it during the off-season. Some heaters have idle electrical draws from control circuits or safety mechanisms, though these are typically minimal. More importantly, leaving electrical equipment plugged in outdoors where it's exposed to moisture and temperature swings can degrade components and create safety hazards. Unplugging and storing it also removes the temptation to use it on impulse during mild winter days when you might otherwise use blankets or move indoors.