Cold days make us long for warmth. One popular way to stay warm? Space heaters. They’re simple devices that warm up our rooms. But sometimes, more than one space heater is needed, especially on cold days. Then the idea comes: “Why not use two heaters at once?”

But it’s about more than just getting warm. It’s about doing it safely. Every plug and wire in our home can handle only so much power. Using too much power can be risky. So, the big question is: Can we use two space heaters at once?

Many people in icy areas rely a lot on heaters. They want their rooms warm but also safe. And they want to avoid substantial power bills. The challenge is finding the right balance between these needs. Let’s break this down and make it clear.

Is it safe to operate two space heaters At Once?

The quick answer? It depends. But usually, yes, you can. However, it’s not just about turning them on. There are things to think about.

For 15A circuits:

A 15A circuit is typical in many homes. When we talk about 15A, it’s about how much power the circuit can handle safely. You might use too much power if you run two big space heaters on a 15A circuit. This could cause the circuit to shut off to keep things safe. Using two full-power heaters might be too much for a 15A circuit.

For 20A circuits:

A 20A circuit can handle more power. This means there’s a better chance you can run two space heaters without issues. But it’s still essential to check how much power each heater uses. If both heaters use a lot of power, even a 20A circuit might struggle. But if they’re small or medium-sized heaters, two should be okay on a 20A circuit.

Using two space heaters at once can be done. But always remember to be safe. Know the limits of your home’s power and choose heaters that fit within those limits. Safety first!

Heater Power120V Circuit (Is running two heaters feasible?)230V Circuit (Is running two heaters feasible?)
800 WattsFeasible (13.33 amps total draw)Feasible (7 amps total draw)
1,000 WattsNot feasible (16.67 amps total draw)Feasible (8.7 amps total draw)
1,500 WattsNot feasible (25 amps total draw)Feasible (13 amps total draw)
2,000 WattsNot feasible (33.33 amps total draw)Not feasible (17.4 amps total draw)

Why Can I Run Two Space Heaters at Once?

Many of us use space heaters to warm up those chilly rooms in our homes. You might have found that more than one heater is needed on icy days. So, you plug in another one, and to your surprise, both run without a hitch. Why does this happen?

Let’s dive into the simple science and mechanics behind this.

Is it possible to operate two space heaters simultaneously?

Your Home’s Electrical Circuit: The Basics

Imagine your home’s electrical system as a series of roads. Cars (or electricity) move along these roads. Now, there’s a limit to how many cars you can have on a road before it gets jam-packed. Similarly, there’s only so much electricity a circuit can handle before it gets overloaded.

This limit is set by the circuit breaker, which is like a traffic cop. When there are too many cars (too much electricity), the traffic cop stops the flow to prevent chaos (or, in the case of your home, a potential electrical hazard).

Space Heaters and Their Appetite for Power

Like any other gadget, a space heater consumes a certain amount of power, measured in watts. Most common space heaters use about 1,500 watts. But how does this relate to our car analogy?

The number of cars on the road can be likened to the number of amps (short for amperes) a device uses. To determine how many amps a space heater uses, divide its wattage by the voltage of your home (usually around 120 volts in the U.S.). So, 1,500 watts divided by 120 volts gives us 12.5 amps.

Running Two Heaters on Different “Roads”

If you’ve plugged your heaters into different outlets, they might be on separate circuits (or roads). This means each heater gets its own 15 or 20-amp road to run on, making it unlikely for the circuit breaker to trip. Each heater operates comfortably without overwhelming the system.

But What If they’re on the Same Circuit?

If both heaters are on the same circuit and it’s a 15-amp one, you might be pushing its limit. With our earlier math, two heaters use 25 amps in total – 10 amps more than the road can handle. Yet, sometimes, the breaker doesn’t trip immediately. Why?

Breakers are designed with a bit of tolerance. They give a small time window before they trip, thinking the overload might be temporary. However, consistently running at this limit isn’t suitable for the system and can be risky.

On a 20-amp circuit, two heaters are just at the edge of their capacity. If nothing else significant is running on the same circuit, they might operate without causing the breaker to trip. Still, you’re operating on thin ice, as any small additional load can cause the circuit to overload.

So, Why Are You Able to Run Two Heaters? In essence, you might use two separate circuits, giving each heater its resources. Or, you’re on a 20-amp circuit that can just about handle the load of two heaters. Alternatively, your breaker shows some tolerance, allowing for a temporary overload.

Can You Run Two Space Heaters On One Circuit?

The decision to run two space heaters on a single circuit is more complex than a simple yes or no. It’s a balance between the power each heater demands and the capacity of the circuit they’re on. Two heaters can run together. But there are conditions and specifics to consider.

Understanding Circuits and Power

Before jumping into numbers, let’s briefly understand circuits. Each circuit in your home is like a separate power lane. Just like a road can only handle so many cars simultaneously, a circuit can only handle so much electricity.

On a 20-amp breaker, how many space heaters can I operate?

The capacity of a 20-amp breaker is more generous than that of a 15-amp one. A standard space heater that consumes 1,500 watts demands 12.5 amps from the circuit. Now, if you run two simultaneously on a 20-amp breaker, they’ll collectively demand 25 amps. That’s beyond the breaker’s limit and might trip, turning off the power. So, while a single powerful heater is fine, two might be pushing it unless they’re smaller units.

What is the maximum amount of watts that can be used on a 20-amp circuit?

The calculation is simple: multiply the amperage by the voltage. Typically, homes have a voltage of 120 volts. So, a 20-amp circuit can handle up to 2,400 watts (20 amps x 120 volts). That’s its maximum capacity without tripping.

What is the maximum wattage that can be run on a 15-amp circuit?

Again, using the multiplication rule, a 15-amp circuit can cater to up to 1,800 watts (15 amps x 120 volts). This means you could run one 1,500-watt heater comfortably, but adding a second one would exceed the limit.

How many amps does a 1500-watt heater take?

To determine the amperage, you divide the wattage by the voltage. The calculation for a heater consuming 1,500 watts in a typical 120-volt home is 1,500 watts ÷ 120 volts = 12.5 amps. So, each 1,500-watt heater uses 12.5 amps.

Benefits Of Running Two Space Heaters Simultaneously

Now, why would someone want to use two heaters simultaneously? There are several reasons, each offering its own set of advantages.

1. Increased Heat Coverage

Imagine trying to light up a large room with a single lamp. There’d be shadows and dark corners. Similarly, one heater might leave cold spots in a big room. With two heaters, the warmth spreads more evenly. You get a uniformly cozy room without any chilly pockets.

2. Reduced Heating Time

If you’re coming home to a cold house, waiting for it to warm up can feel like forever. Two heaters can cut this waiting time. They work together, making the room comfortable twice as fast as a single unit would.

3. Energy Efficiency

It sounds counterintuitive, but two modern, efficient heaters consume less energy than one old, large unit struggling to warm a space. Newer models are designed to be energy-efficient, turning off when the desired temperature is reached and consuming power only when needed.

4. Cost Savings

In line with energy efficiency, two effective heaters might be more economical in the long run. While the initial cost might be higher, the savings on monthly bills can add up. Plus, with two heaters, you can use just one when the weather is milder.

 Running two space heaters on one circuit is a matter of math and safety. While it can be done, staying within your circuit is crucial, which could be risky. Always prioritize safety over convenience. However, using two heaters simultaneously can offer warmth, efficiency, and savings if done correctly.

Can Two Space Heaters Trip The Circuit Breaker?

To answer the question simply: it depends. Running two space heaters simultaneously can trip the circuit breaker, but this outcome hinges on various factors, primarily the circuit’s capacity and the power consumption of the heaters. Let’s delve into the circuit breakers world and see how they interact with space heaters.

The Role of the Circuit Breaker

Think of a circuit breaker as a guardian of your home’s electrical system. Its primary job? To protect your home from potential electrical fires that can arise when too much current flows through the wires.

If you’ve ever used a drinking straw, you’ll know there’s a limit to how much liquid you can sip. Push beyond this limit, and the straw might collapse, or the liquid won’t flow. Similarly, each circuit in your home can only handle a specific amount of electricity, measured in amps. If the demand exceeds this limit, the circuit breaker “trips” or shuts off the circuit to prevent damage or a potential fire.

The Power-hungry Nature of Space Heaters

Space heaters are power-hungry by design. A typical one can consume around 1,500 watts. Plugged into a standard home voltage (often 120 volts in the U.S.) translates to about 12.5 amps.

So, two space heaters would consume approximately 25 amps. If you plug them into outlets on the same 15-amp circuit, you’ll exceed the circuit’s capacity, and the breaker will likely trip. On a 20-amp circuit, you’re hovering right at its upper limit. While it might handle the load momentarily, any slight additional demand (like turning on a light or another appliance) might trip the breaker.

Other Considerations

  • Age of Your Home’s Electrical System: Older homes might have outdated electrical systems not designed for modern electrical loads. Even if you’re within the amperage limits, old wiring can still cause breakers to trip.
  • Condition of the Space Heaters: Heaters in good condition will operate as specified. However, a malfunctioning heater could draw more power than intended, increasing the risk of tripping the breaker.
  • Other Appliances on the Same Circuit: If other appliances share the circuit with the space heaters, the combined electrical load might exceed the circuit’s capacity, even if the heaters alone don’t.

Running two space heaters on a single circuit can trip the circuit breaker, especially if they’re both high-wattage units and other devices that share the circuit.

While the warmth of two heaters might be enticing, knowing your home’s electrical capacity is vital. It’s advisable to exercise caution and seek the advice of an electrician if you require clarification regarding your home’s electrical capabilities.

After all, safety should always take precedence over comfort.

Considerations When Running Two Space Heaters Simultaneously

As the chill of winter takes hold, the allure of added warmth becomes increasingly tempting. Using two space heaters might seem efficient to enhance warmth, but there are several factors to be wary of to ensure safe operation.

I. Circuit Capacity: Electrical Balance

Every home comes with electrical circuits, each designed to handle a certain amount of electricity. Think of this like a bridge’s maximum weight capacity. Overloading can lead to complications like a tripped breaker or even potential fires.

When you operate two heaters simultaneously, they pull a substantial amount of electricity. Hence, always check that your circuit can bear this load. If in doubt, consulting an electrician or checking your circuit breaker’s specifications can provide clarity.

  II. Power Consumption: Monitoring Energy Use

Running two heaters simultaneously means double the energy consumption. Yes, they offer added warmth but they will also increase your electric bill. It’s essential to be aware of the power each heater demands.

Extended operation of both heaters can result in costs that surprise you at the end of the month. A simple check of each heater’s wattage and some quick math can give you an idea of the expected cost increase.

 III. Extension Cord Safety: Proper Usage

Sometimes, consider using an extension cord due to outlet placements. But remember, not all cords are designed to manage the high power draw of a space heater.

Choosing a heavy-duty cord that’s rated for the wattage is crucial. And it’s equally essential to ensure that the cord is laid out straight, preventing any tripping hazards and ensuring smooth power delivery.

 IV. Heater Placement: Prioritizing Safety

Where you place your heaters impact warmth distribution and safety. It’s vital to position heaters away from any flammable materials like curtains or furniture.

A general rule is maintaining a distance of at least three feet around the heater. This reduces the risk of any potential fires and promotes even heat spread in your room.

  V. Temperature Control: Maintaining Comfort

Operating two heaters can lead to a rapid rise in room temperature. The goal is to achieve a comfortable warmth, but overdoing it can result in discomfort or safety risks.

Many modern heaters have built-in thermostats. If yours doesn’t, consider getting a room thermometer to monitor the temperature. Adjusting your heaters according to the room’s temperature ensures a pleasant environment.

Space heaters, while immensely beneficial, come with inherent risks. Regular inspections for wear or damage, especially in cords or plugs, are advisable. It’s also a good practice to avoid leaving heaters unattended.

While two space heaters can be an effective solution for additional warmth, using them judiciously and safely is imperative. After all, safety should always precede comfort.

Picking the Right  Safe Space Heaters for One Circuit

Before you plug in two heaters simultaneously, let’s talk about doing it safely. And, of course, some heaters are better suited for this than others. Let’s dive in.

The Basics

First things first, it’s essential to understand your circuit’s capacity. Most homes have circuits that can handle 15 or 20 amps. So, you want heaters that, when combined, won’t exceed this limit.

Brands That Shine

  1. Honeywell:A trusty name in the heating world, Honeywell’s range of energy-efficient space heaters is impressive. Their ceramic heaters are designed to provide powerful heat without guzzling too much electricity. If you’re considering running two heaters on a single circuit, their low-wattage options might be a good fit.
  2. Lasko:Lasko’s ceramic tower heaters are a hit among many. Not only are they sleek and easy on the eyes, but they also come with built-in safety features like overheat protection. Their energy consumption is lower, making them ideal candidates for tandem use.
  3. DeLonghi:This brand offers oil-filled radiators, which are great for consistent and lasting heat. The bonus? These heaters typically use less power than their ceramic or infrared counterparts. Running two DeLonghi radiators together can provide room-filling warmth without tripping the breaker.
  4. Vornado:If you’re a fan of the fan-style heater, Vornado might be your pick. Their heaters effectively circulate warm air throughout the room. Best part? They have energy-saving models that use less power, so you can safely operate two on the same circuit.

A Word on Safety

Even with the best heaters, safety is paramount. Here are a few quick tips:

  • Distance: Ensure each heater has space. Keep them at least three feet away from anything that might catch fire.
  • Surface: Always place heaters on a flat, stable surface. We want warmth, not wobbles.
  • Inspection: Before every winter season, give your heaters a once-over. Check for any wear or damage.
  • Automatic shut-off: This is a feature of many modern heaters. It turns the heater off if it tips over. Handy, right?

While running two space heaters simultaneously is a surefire way to combat the cold, it’s crucial to pick the right ones and use them responsibly. The brands mentioned above are just a starting point. Always check the wattage, read reviews, and prioritize safety features.

Remember, warmth is lovely, but safety always comes first. Stay warm and stay safe this winter!

Alternatives to Running Two Space Heaters

Rather than relying on multiple space heaters, there are alternative solutions that can help you stay warm and comfortable during the colder months.

Central Heating

One alternative to running multiple space heaters is to invest in a central heating system. This can provide more consistent and efficient heating throughout your entire home. While it may be a more significant investment upfront, it can save you money in the long run by reducing your energy bills.

If you’re not able to install a central heating system, you may want to consider upgrading your current heating system. This could include replacing an old furnace or boiler with a newer, more energy-efficient model. Additionally, you could install a programmable thermostat to help regulate the temperature in your home more effectively.

Insulation Improvements

Another alternative to running multiple space heaters is to improve the insulation in your home. This can help prevent heat from escaping and keep your home warmer without relying on additional heating sources.

Some ways to improve insulation in your home include adding weatherstripping to doors and windows, sealing any air leaks, and adding insulation to your attic, walls, and floors. While these improvements may require an upfront investment, they can ultimately save you money on your energy bills and make your home more comfortable.

In conclusion, while running two space heaters may seem like a quick fix for a chilly home, there are alternative solutions that can provide more consistent and efficient heating. By investing in central heating or improving insulation, you can stay warm and comfortable without relying on multiple space heaters.

Thinking of Doubling Up? Here’s What You Should Know About Plugging Two Space Heaters At Once

Safety PointDescription
Check WattageEnsure the combined wattage of two heaters doesn’t exceed the circuit’s limit.
Outlet HealthRegularly inspect outlets for signs of wear, burn marks, or damage.
Proper SpacingPosition heaters at least 3 feet away from flammable materials like curtains, furniture, or bedding.
Use One at a TimeTo minimize risks, consider using just one heater per outlet.
Automatic Shut-offChoose heaters that have an automatic shut-off feature in case they tip over.
Avoid Extension CordsIf possible, plug heaters directly into the wall. If you must use an extension cord, ensure it’s heavy-duty and rated for the heater’s power.
Regular InspectionPeriodically check heaters for signs of damage, especially the cord.
Keep DryNever use a space heater in damp areas unless it’s specifically designed for it.
Unplug When Not in UseAlways unplug heaters when they’re not in use to prevent any unforeseen risks.
Monitor Children & PetsAlways supervise children and pets when a heater is in use.


Let’s sum up what we’ve learned about space heaters on this journey. They’ve become our winter buddies, keeping us cozy. And what about using two heaters at once? It’s like a warm hug when it’s freezing outside. The good stuff includes quicker warmth and better coverage, but there’s also a not-so-good side.

Remember when we talked about circuit capacities? It’s like not overloading a backpack. Whether it’s a 15A or 20A circuit, you want things to stay safe. Brands like Honeywell and Lasko are stars for being good and safe, but still, you’ve got to be careful.

Safety is super important. Keep heaters away from stuff that can catch fire, make sure they’re on solid surfaces, and think about ones that switch off by themselves.

Safety can’t be stressed enough. Keeping heaters at a distance, ensuring they’re on stable surfaces, and opting for models with an automatic shut-off? All vital. And finally, a gentle reminder: always stay informed. Check wattages, go through reviews, and always, always prioritize safety. So there you have it.. Stay warm, and more importantly, stay safe. Stay warm and, even more, stay safe.