Menu Close

Extension Cords For a Space Heater

Best Extension Cord For a Space Heater

Space heaters are a great way to heat up a room or area. However, if you are not near an outlet, you will need an extension cord. It is important to know that using the wrong extension cord for a space heater can cause a wide range of problems. Therefore, I’ve created a guide for the best extension cord for a space heater.

What type of extension cord do you need for a space heater?

A space heater will require either a 12 gauge or 10-gauge extension cord, depending on the type of space heater as well as the length of the cord. I’ll break it down below.

Most space heaters connect to a 120V battery and have a wattage range between 1,500-1,800 watts, with an amperage of around 15A.

Now both a 12-gauge and a 10-gauge extension cord have enough insulation to carry that much power from the outlet to the space heater. However, longer cords will require more power capabilities. Therefore, if you need an extension cord that is longer than 25 feet, I suggest you get a 10-gauge cord.

If you’re space heater is 240V, then it will also require a 10-gauge cord.

My favorite extension cord for space heater

The best extension cord for a space heater is the Iron Forge Black Extension cord. It is a 12-gauge cord that can safely be used indoors and out.

If you want more of a heavy-duty cord for your space heater, I recommend the EP 25 foot extension cord.

Iron Forge Black Extension cord

This black extension cord from Iron Forge is a great extension cord for your space heater. This 10 foot, 12-gauge extension cord can handle the electrical current of just about all space heaters. It can carry up to 1,875 watts and 125 volts, and up to 15 amps.

You should look at the manual of your space heater to make sure it doesn’t require more than 1,800 watts if you want this cord.

What I also really like about this extension cord is that it is both water and flame resistant. You can buy the cord on amazon for around $20, and you can sign up online for a full life-time warranty. While it does come with other length options including 25ft, 50ft, and 100ft, I would suggest only using the 10 foot or 25 foot for a space heater.

You can also use this cord for portable air conditioners or power tools such as circular saws.

EP 25 foot extension cord – Best heavy duty

If you have a large space heater that requires more than 1,800 watts, than this is your best option. It’s also a good option if you need a cord longer than 10 feet.

This 10-gauge extension cord can handle up to 3,600 watts and 30 amps, which is more than enough for a space heater. This cord can also be used both inside and outside. It can also bear temperatures as low as -40 degrees fahrenheight. Along with the 25ft option, there are also 3ft, 10ft, and 50ft options for this cord.

A great feature of this cord is that it contains an LED light that indicates when there is power going through the cord. This helps ensure that the cord is plugged in correctly.

Due to it’s increased power capabilities, it is a little more expensive. Most marketplaces sell this cord for around $50.

If you have a generator, you should check out my guide on the best extension cord for a generator.

Can you use a regular extension cord for a space heater?

It is important that you don’t use a normal, everyday extension cord for a space heater. A regular extension cord does not have the insulation or capacity to carry the power needed for a space heater. If you use a regular extension cord, it will start to heat up, and can eventually cause a fire. It can also cause damage to your space heater.

Additionally, using a regular extension cord will use more electricity than a heavy-duty cord.

How to use a space heater with an extension cord

Now that you know the best extension cords for a space heater, it is important that you know how to properly use it. Below are some important safety guidelines you should keep in mind.

Don’t twist the cord

It is important that you make sure the cord is not twisted or tangled anywhere. Not only can this cut off the circuit of power, but it can also be a fire hazard. You should also make sure that the cord is not located where there is a lot of foot traffic.

Firmly plug in

The extension cord must be plugged in directly to the outlet. Ordinary power strips do not have the capability to carry the power required for a space heater.

You should make sure the extension cord is firmly plugged into both the outlet, as well as the space heater. An inadequate connection can cause sparks and even fire.

Safe distance from space heater

It is important that you don’t have any object within 3 feet of the side of the space heater emitting the heat. This includes the extension cord.

Closely monitor

You should closely monitor the extension cord the first time you use it with a space heater. While it is normal for the cord to get a little warm, it should not get excessively hot. If you it gets hot or you notice any sparks, you should unplug it immediately.

If your space heater keeps shutting off, it means that the cable is not strong enough.


I hope this article gave you insight on the best type of extension cord to use with a space heater. Extension cords can make it much easier to use the space heater, and also give you flexibility on its location. Just make sure you get an extension cord that can handle the power!