Space Heater Wattage: What It Is, What It Does, And How Much You Need

Space Heater Wattage

For those who make our homes in cooler climates, winter means fewer days, lower temperatures, and more time spent indoors. For your household, what does this mean? A higher energy bill and less time spent relaxing at home are the results. Energy efficiency need not suffer in the name of warmth.

In truth, the opposite is correct. If you follow these guidelines for space heater wattage, you can reduce your heating bill without sacrificing comfort.

Knowing how much heat your home needs will help you choose the best space heater. And if you ever find yourself in a position where you need to shop for a new space heater, be sure to check out our breakdown of the top models available for residential use.

What Is A Space Heater’s Wattage?

The power consumption of a space heater is measured in terms of its watts. The answer to this question shifts based on the heater’s efficiency, the room’s dimensions, and the intended temperature.

Space heaters are widely used in houses, of which the wall unit is the most popular variety. These heaters generate heat using electricity and typically have an estimated wattage between 100 and 750. Power consumption is determined by factors like room size and set point.

For a smaller room maintained at about 75 degrees Fahrenheit, you would use a device with a wattage of 100 to 300. If you needed to get a larger space up to about 105 degrees Fahrenheit, you’d need a device with a wattage of 400 to 600.

What Does A Space Heater Wattage Do?

Space heater power is measured in watts. A more powerful space heater would have a higher wattage. The wattage of the space heater you buy should be proportional to the room’s square footage. A 1,000-watt space heater, as opposed to a 200-watt space heater, would be more suitable for a larger room.

How Much Wattage Do We Need?

The watts needed for space heating can be difficult to understand. What does the wattage of your heater signify, though? The wattage of an appliance is a measurement of its power consumption. It depends on the device, but a space heater generally needs more watts than a fan or light bulb.

Choose a space heater with the appropriate wattage, generally between 1 and 3 watts.
Remember that watts don’t always equal heat; sometimes a higher wattage sends less heat into the space. So, before buying a space heater, read the product description thoroughly to get what you want.

How Do I find The Correct Space Heater Wattage For My Home?

Getting the appropriate wattage is crucial when shopping for a space heater. Many alternatives are available, making it difficult to determine which wattage is ideal for your home. The area that has to be heated is the primary factor in determining the appropriate wattage for your property. Next, separate one-third of the space and calculate the individual power requirements.

Finally, select a space heater whose total wattage is equal to or greater than the sum of the wattages required for the three zones.

Space heaters with greater wattages (1000 or 1200) may be more appropriate if you need to warm a large room that a 750-watt model doesn’t adequately heat. Consider an 800-watt space heater if a 500-watt heater would be overkill.

If you are still determining the wattage requirements for your property or need assistance selecting the appropriate space heater, remember always to ask an electrician.

Safety Guidelines For Using A Space Heater

Take note of these safety precautions for using a space heater:

  • Make sure you’ve studied the manual carefully.
  • Turn your space heater down to its lowest wattage setting.
  • Only use a space heater in a room with good air circulation.
  • The space heater must be kept out of the reach of youngsters at all times while it is in use.
  • Never use a broken space heater.

What Factors Affect Space Heater Wattage?

The wattage of a space heater can vary greatly depending on the heating element’s material, the room’s size, and the temperature outside.

A space heater with a ceramic heating element will create more heat than an electric one because ceramics are a more efficient heat transfer material.

There’s also the fact that space heaters are most effective in already-warm rooms; if the room is cold, the space heater won’t be able to provide as much heat.

What Is The Watts Usage Per Hour?

The wattage consumed by a heater per hour is conditional on the heater’s kind and the desired temperature. Electric heaters consume about 100 watts per hour, but gas heaters can consume up to 350 watts per hour.

Depending on its output, a heater has an hourly power consumption. A heater with a wattage of 1,000 will consume 1-kilowatt hour each hour. If your 1,000-watt heater is on for eight hours daily, it will consume eight kilowatts of power over a month.

What Is The Wattage Of A Space Heater On Low?

Please turn off your space heater and disconnect it from the wall to see how many watts it consumes when set to low. Then, using an ohmmeter, check the current between the connector’s pins (see Figure 1). When your space heater is off, the voltage should range between 110 and 120. If the detected voltage is below 110 or above 120, replace your space heater.

How to calculate the watts of the space heater?

Know these things to determine your space heater’s wattage. First, your space heater has watts. Space heaters output BTUs. Finally, watt hours (Wh) measure how long a space heater will run based on its power and BTU rating. Space heater watts and Wh calculations:

  • watts = wattage x 9600. For instance, a 100W space heater’s total wattage is 9600
  • BTUs = watts / 1,000. The BTU rating of a 100W space heater that generates 1,000 BTUs of heat is 10 BTUs/hour
  • Watts times BTU rating divided by 24 hours yields Wh. If a 100W space heater produces 1,000 BTUs of heat in 24 hours, its Wh rating is 10Wh/hour


Are all space heaters 1500 watts?

All heating appliances for a room are not the same. Modern options come in a wide range of wattages and designs. Detailed descriptions of each kind are provided below.

Typical wall heaters have heating capacities between 100 and 1000 watts. Using them in smaller rooms or those that don’t require as much heat is best. There is a wide range of wattages available for these space heaters, from 500 watts up to 1500 watts. They’re great for places that require more heat than a standard wall heater can give, including larger rooms.

Space heaters with cords are like those with none. Similar to wall heaters, but with an electrical line that extends the entire length of the heater. Compared to electric space heaters, they are, therefore, more user-friendly. Space heaters that require an extension cord are not practical if you need to heat a sizable room. However, a standard wall heater can be ideal if you need heat.

What size room can a heater with 1500 watts heat?

A room with a 1500-watt heater will heat up to 350 square feet.

What is the best wattage for a space heater?

If you’re in the market for a new space heater, one of the most important specs to look for is its wattage. In general, a higher wattage results in a hotter space heater. However, keep in mind that using an excessively high wattage can potentially cause damage to your heating system.

Exactly how many watts should a space heater have?

Space heaters with a minimum of 940 watts of power are encouraged by the Environmental Protection Agency (EPA).

A power source with a wattage of at least 2,000 is preferred in most cases. You should know that more expensive heaters mean more excellent heat, but higher wattages entail higher prices.

Is 750 watts too much power for a room heater?

Indicative of the heater’s capacity to generate heat, watts is a standard power measurement.

There is a direct correlation between the wattage of a space heater and its ability to generate heat; a 1000-watt heater will not be as effective as a 750-watt heater—a higher wattage results in a higher temperature output.


The wattage of your space heater is crucial if you want to keep your home toasty warm during winter. We have described the many types of space heaters and their individual wattage requirements, as well as the various types of places for which they are appropriate. We offer some parting thoughts on how to choose a space heater for your house.

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