Are Space Heaters Expensive to Run in 2026?

Electric Draw: What a Space Heater Pulls From Your Wall

Almost every standard portable electric heater sold in the United States runs at a maximum power level of 1,500 watts. Wattage is simply a measure of electricity draw, meaning how fast an appliance pulls power from your electrical panel. On a typical 120-volt household circuit, pulling 1,500 watts demands about 12.5 amps of continuous electrical current.

To put that in perspective, pulling 1,500 watts is roughly the same electrical draw as running a handheld hair dryer or a microwave oven continuously. Most residential bedroom and living room circuits are protected by 15-amp circuit breakers. Because a heater takes up 12.5 of those 15 amps all by itself, running a television, a computer, or even a couple of bright lamps on the same circuit can overload the wiring and trip the breaker.

Many units offer a low power level, typically 750 watts or 900 watts. When you toggle the switch down to low, the unit cuts its electricity draw in half. The heater warms up more gently, draws roughly 6.25 amps, and reduces the strain on your wiring while pulling half as much power from your panel each minute it runs.

In standard construction with eight-foot ceilings, a general sizing guideline is roughly 10 watts per square foot of living space. A 1,500-watt heater can comfortably warm a closed 150-square-foot bedroom or home office. Trying to use that same unit to heat an open 400-square-foot living room forces the unit to run continuously without ever raising the room temperature to your target level.

Plugging directly into a dedicated wall outlet is necessary for safe operation. Never plug a space heater into an extension cord, power strip, or surge protector. Those cords are rarely built to handle a continuous 12.5-amp load for hours, which can cause the plastic casing to melt, overheat, and spark an electrical fire.

How to Calculate Your Space Heater Running Cost in Four Steps

Figuring out whether a space heater will cause an unaffordable power bill takes just four quick steps. You only need the information on your heater label and your latest electric statement.

1. Find the electricity draw on the product label. Look at the safety sticker on the back or bottom of the heater. Look for the maximum wattage, which is usually listed as 1,500 watts (often written as 1500W) on high or 750 watts on low.
2. Convert the wattage to kilowatts. Electric utility companies bill you in thousands of watts, known as kilowatts. Divide your heater wattage by 1,000. A 1,500-watt heater equals 1.5 kilowatts, while a 750-watt low setting equals 0.75 kilowatts.
3. Find your electric rate per kilowatt-hour. Look at your latest power bill for your billing unit cost, which appears as the rate per kilowatt-hour (abbreviated as kWh). This rate represents what you pay to run 1,000 watts of power for one full hour. Check the total rate, which includes both the electricity supply charge and the delivery charge. Rates vary by region and season, so checking your exact bill provides the only accurate baseline.
4. Multiply kilowatts by your rate and run time. Take the kilowatt number, multiply it by your billing rate, and multiply that by the number of hours you plan to run the unit each day.

Here is how that calculation works in everyday life. If your utility company charges twenty cents per kilowatt-hour, a 1,500-watt heater running on high draws 1.5 kilowatts every hour. Multiplying 1.5 by twenty cents equals thirty cents per hour of active heat. Running that heater continuously for eight hours during a work shift costs two dollars and forty cents per day. Over a thirty-day month, that single heater adds seventy-two dollars to your bill if the heating coils draw power the entire time.

That total drops significantly if your unit uses a thermostat (a switch that cycles heat on and off). Once your room reaches your target temperature, the thermostat switch cuts power to the heating element and only switches back on when the room cools down. If the heater cycles on for thirty minutes out of every hour, your real running cost is cut right in half.

Space Heater Versus Central Heating: When It Actually Saves Money

A space heater is expensive when used to heat an entire house, but affordable when heating only the room you are currently using. Understanding this difference is the key to keeping your monthly utility bills manageable.

Central heating systems like gas furnaces or heat pumps are built to warm every square foot of your home through ductwork. Warming a 2,000-square-foot house to 72 degrees Fahrenheit burns large amounts of fuel or electricity, even in empty guest rooms and hallways. When you practice zone heating (heating only the room you are in), you lower your central thermostat to 64 or 65 degrees while using a portable heater to warm just your closed bedroom or home office to 70 degrees.

Lowering your central thermostat by five to eight degrees can trim significant dollars off your primary winter heating bill. Because you are only paying twenty to thirty cents an hour to warm the small space where you sit, the savings on your central heating fuel often outweigh the electricity the space heater uses.

The problem begins when homeowners try to use space heaters as primary heat sources for large or unsealed spaces. Trying to warm an uninsulated area like a sunroom forces the heater to run on high without ever shutting off. If you are struggling with cold drafts in a converted porch, choosing a specialized heater designed for an enclosed porch helps manage that environment better than a basic portable unit. Similarly, in manufactured housing with long duct runs, selecting an appropriate heater for a mobile home avoids overworking small plug-in units.

Running multiple space heaters in separate rooms at the same time is another expensive mistake. Two heaters running on high draw 3,000 watts, and three heaters draw 4,500 watts. At that rate, you are consuming as much power as an electric clothes dryer running non-stop, which will quickly wipe out any savings and produce an outrageous bill.

Practical Ways to Lower Operating Costs and Choose the Right Heater

Keeping your electric bill predictable comes down to how you manage the warm air in your room and which hardware features you choose. Before turning your unit on, follow this simple checklist to keep heat from escaping:

• Close the room door and seal drafts. Block cold air leaks under doors with a draft stopper, and pull window blinds shut so heat stays trapped inside your immediate space.
• Drop your central thermostat setting. Lower your central heating temperature by several degrees so your main furnace rests while you heat your occupied room.
• Switch to the low power setting after warmup. Start on high to take the initial chill out of the air, then switch down to 750 watts to maintain steady warmth on half the electricity draw.
• Keep the 3-foot safety buffer clear. Keep bedding, curtains, area rugs, and furniture at least 3 feet away from the front and sides of the heater grille to prevent heat blockages and fire hazards.
• Turn the unit completely off when leaving the room. An electric heater warms the living space you occupy; running it in an empty room simply wastes money.

When shopping for a heater to help lower your heating expenses, look for models equipped with energy-managing hardware. The most valuable feature is a digital temperature dial that clicks on and off to hold your set warmth. Without a reliable thermostat switch, a unit blows heat non-stop until you manually unplug it, wasting power and overheating the room. For detached work areas where maintaining an exact temperature matters, an electric heater for a garage with a thermostat ensures the unit only pulls current when the building actually drops below your target comfort level.

You should also match the heating style to how you use the room. A fan that pushes warm air across the room works well for circulating warmth throughout an entire closed bedroom. However, if you sit at a desk, a unit that provides gentle heat that warms people and furniture directly like sunlight (radiant or infrared heat) keeps your body warm immediately without wasting power trying to heat all the empty air near the ceiling.

Look for units with multiple manual power settings, such as 750W Low and 1500W High, so you can control your electricity draw. Built-in timers that shut the heater off after set hours prevent accidental all-night heating. Finally, check the product label for a recognized safety certification mark such as UL, ETL, or CSA to ensure the internal electrical parts meet strict North American safety standards.

1

Heat Storm Phoenix Infrared Space Heater with Attachable Feet, Remote

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• BWP Score

  BWP Score is a ranking system developed by Bestwinterproducts.com. BWP score has no relationship or impact from any manufacturers or sales agent websites. Learn more

  8.3
• Brand
  Heat Storm

Key specs2

Power Draw and Heat Output

The Heat Storm unit provides a 750W low mode and a 1500W high mode generating 5200 BTU. Running on low cuts electrical demand by 50 percent, making it easier on household circuits.

Mounting Versatility

Weighing 9 pounds with removable feet and rear mounting points, this heater installs directly on a wall or stands freely on the floor.

Pros & cons42

Pros

• Dual 750W and 1500W power settings let you cut electricity draw in half to help control running costs
• Wall-mount points and removable feet provide placement options off the floor to save room space
• Exterior casing and front grill remain safe to touch during operation
• Built-in digital thermostat with ambient temperature display cycles heat automatically to avoid waste

Cons

• Lacks an internal oscillation feature to sweep warm air mechanically across wide rooms
• Manufacturer lists coverage only for small rooms or offices, requiring verification for larger spaces

2

Dr. Infrared Heater, 1500W, Advanced Humidifier and Oscillation Fan and

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• BWP Score

  BWP Score is a ranking system developed by Bestwinterproducts.com. BWP score has no relationship or impact from any manufacturers or sales agent websites. Learn more

  8.2
• Brand
  DR. INFRARED HEATER

Key specs2

Built-In Humidifier

An integrated ultrasonic cool-mist humidifier combines with the infrared quartz and PTC heating system to warm the space without drying out indoor air.

Safety and Run-Time Control

Features tip-over and overheat shut-offs alongside a 1 to 12 hour timer and lifetime washable filter to regulate operation safely.

Pros & cons42

Pros

• Oscillating fan actively distributes warmth across the room to eliminate cold pockets
• Built-in ultrasonic cool-mist humidifier restores indoor moisture during winter heating
• Digital thermostat adjusts from 50°F to 85°F to cycle heating elements off at your target temperature
• Programmable 1 to 12 hour timer automatically powers down the unit to prevent unnecessary electricity draw

Cons

• Heavy 24.8-pound weight makes moving between rooms less convenient than compact portable heaters
• Listing does not state a lower wattage setting below 1500W, drawing full power during active heating cycles

Last update on 2026-10-07 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

FAQs

Does running a space heater on the low setting really cut electric costs in half?

Yes, running your heater on the low setting cuts your hourly electricity draw directly in half. A unit pulling 750 watts on low uses exactly half the kilowatt-hours of a 1,500-watt high setting over the same duration. The heater will take longer to warm up a chilly space from scratch, but it will maintain your existing warmth while drawing far less power from your wall.

Is it cheaper to leave a space heater on all day or turn it off when leaving the room?

It is always cheaper to turn a space heater completely off when you leave the room. Electric space heaters warm rooms quickly, so there is no financial benefit to keeping them idling in an empty space. Leaving a heater running unattended wastes valuable kilowatt-hours and introduces an unnecessary fire risk.

Why does my wall outlet feel warm when my space heater is running?

A faint warmth at the outlet cover can happen because the heater pulls a continuous 12.5-amp current near the circuit limit. However, if the outlet or the plug prongs feel hot to the touch, or if you smell hot plastic, turn the unit off and unplug it immediately. This indicates a loose wire or a worn receptacle, and you should call a licensed electrician to inspect the outlet before using that circuit again.