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Homeowner examining an electrical breaker panel with a portable space heater on the kitchen floor
01Inspection FAQ

Can your kitchen circuit run the oven and a space heater at the same time?

Find out if your kitchen can run an oven and space heater together, and how to safely check your breaker panel.

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9 min
Updated
October 8, 2026

It's a cold fall morning. The oven is preheating, maybe for a practice pie before Thanksgiving, the kitchen floor feels like ice, and you want to plug in the space heater. In most houses wired to current practice, a built-in electric oven and a plug-in heater can run at the same time. They aren't on the same circuit. The real risk is the heater sharing the counter outlets with a toaster oven, coffee maker or microwave. Here's how to tell which situation your kitchen is in.

01The short answer

How much the oven matters depends on what kind of oven you have:

  • A built-in electric wall oven or range runs on its own 120/240-volt (or 120/208-volt) individual branch circuit with its own breaker. GE's wall-oven instructions require that model to be hardwired into a junction box. No plug or receptacle is allowed, so there's nowhere on the oven circuit to plug in a heater. You can run both.
  • A gas oven uses little electricity. Its receptacle, which powers the clock, light and igniter, is allowed on the counter circuit. A glow-bar igniter draws roughly 2.5 to 3.8 amps depending on the model, and only while it's heating. Spark igniters draw much less. The gas oven can share a circuit with the heater, but it takes up some of the room.
  • A countertop toaster oven plugs into the same kind of 120-volt outlet as the heater. Two Breville models are listed at 1,800 watts. This is the oven that usually can't share a circuit with a 1,500-watt heater.

02What "the kitchen circuit" actually is

A kitchen built to current rules has several circuits. Each one has a job.

Small-appliance circuits. Countertop receptacles need at least two 20-amp, 120-volt small-appliance circuits. Those circuits also cover the pantry, breakfast room and dining room receptacles. They may not feed light fixtures, and one circuit may not serve more than one kitchen. The only exceptions are a clock receptacle and the gas-range receptacle.

The oven or range circuit. An electric oven gets an individual circuit sized from its nameplate. GE's chart for one wall oven at 240 volts:

  • Up to 4.8 kW: 20 amps
  • 4.9 to 7.2 kW: 30 amps
  • 7.3 to 9.6 kW: 40 amps
  • 9.7 to 12.0 kW: 50 amps

A household range rated 8¾ kW or more needs at least a 40-amp circuit.

Wire size and breaker size go together. A 15-amp breaker protects 14-gauge copper, a 20-amp breaker protects 12-gauge copper, and a 30-amp breaker protects 10-gauge copper. The breaker is there to protect the wire.

Older kitchens are different. Many older houses have 15-amp counter circuits. Some have kitchen outlets on the same breaker as a bedroom or living room. Cities and states also adopt different editions of the National Electrical Code, and existing wiring doesn't update itself when the code changes. The panel in your house tells you what you have. The code book only tells you what's supposed to be there.

03Why the heater is the heavy plug

A typical portable heater, such as a listed Lasko 1,500-watt model, is rated at 12.5 amps (1,500 watts ÷ 120 volts). For a cord-and-plug appliance, that's about as big as it gets.

Here are the limits it runs into:

  • 15-amp circuit: 1,800 watts on paper, 1,440 watts (12 amps) at 80 percent
  • 20-amp circuit: 2,400 watts on paper, 1,920 watts (16 amps) at 80 percent

That 80 percent figure comes from two rules. First, on a circuit with more than one outlet, no single plug-in appliance should be rated above 80 percent of the circuit. Second, a continuous load (one running at full current for three hours or more) has to be sized at 125 percent, which works out to the same 80 percent limit. A heater with a thermostat cycles and may not technically count as continuous. Still, 80 percent is the right planning limit for a heater you leave running.

The heater alone is already over the 12-amp mark on a 15-amp circuit. Listing labs can approve portable products up to the full circuit rating, which is why 12.5-amp heaters with ordinary plugs are still on store shelves.

Now add some common kitchen appliances to a 20-amp counter circuit:

  • Heater alone: 12.5 amps. Fits under 16.
  • Heater plus a gas-oven glow-bar igniter (about 3.2 to 3.6 amps on common models): close to 16 amps, before anything else is turned on.
  • Heater plus a 900-watt Mr. Coffee 12-cup maker (7.5 amps): 20 amps. That's the full rating of the breaker.
  • Heater plus an 1,800-watt countertop oven (15 amps): 27.5 amps. That's past both a 15-amp and a 20-amp breaker.
  • Heater plus a microwave: GE says its microwaves belong on an individual 15- or 20-amp circuit. Over-the-range models should always have a dedicated circuit. A microwave plugged into the counter circuit is one of the most common reasons a heater trips the breaker. Check the watts on your microwave's label.

To sum up: a heater alone can fit on a 20-amp counter circuit. A heater plus almost any other appliance that heats something can't.

04How to check your kitchen

Use the breaker panel, not the outlet. The outlet's face won't tell you the circuit's rating.

  1. Plug a lamp into the outlet you'd use for the heater. Turn it on.
  2. **Turn breakers off one at a time** until the lamp goes out. Write down the number on that breaker handle (15 or 20). That number is the circuit rating. Turn the breaker back on.
  3. Find the oven breaker. It's usually a double-pole breaker marked 30, 40 or 50. If turning it off doesn't kill the lamp, the oven and the heater aren't sharing a circuit.
  4. Check the same breaker for the microwave, toaster and coffee maker outlets. Anything on that breaker counts against the heater's limit.
  5. Look for other rooms on the circuit. Homeowners regularly find one breaker feeding a bedroom heater and the kitchen microwave, or a living-room heater that trips whenever the toaster oven runs. That's a shared circuit, and current kitchen rules don't allow it.

Stop using the outlet if:

  • the plug or outlet is warm
  • you smell something burning
  • the heater's cord is cracked, frayed or loose
  • the breaker trips again right after you reset it

A breaker that keeps tripping is doing its job: it's protecting the wire from overload. Swapping a 15-amp breaker for a 20-amp one on 14-gauge wire doesn't fix anything. It removes the protection.

05Running the heater safely, and when you need a new circuit

The basic safety rules from the Consumer Product Safety Commission (CPSC) and the Electrical Safety Foundation International (ESFI):

  • Buy a heater listed by a recognized testing lab.
  • Plug it straight into a wall outlet. Never use an extension cord or power strip, and don't plug anything else into that outlet.
  • Keep it at least three feet from anything that can burn, including dish towels, curtains, paper bags and kitchen chairs.
  • Set it on a level floor, not on carpet, a counter or a cabinet.
  • Turn it off when you leave the room or go to bed.
  • Use it only for extra heat. It isn't a dryer or a cooking appliance.

The fire numbers come from different agencies counting different things, so each one appears here with its source:

  • CPSC (January 5, 2023): portable heaters were involved in an average of 1,700 fires, 70 deaths and 160 injuries a year from 2017 to 2019.
  • U.S. Fire Administration (same years): about 1,100 portable-heater fires a year in residential buildings, causing 65 deaths a year. Those fires were 41 percent of fatal residential heating fires. The leading factor was a heater too close to something that could burn.
  • NFPA (2020–2024): space heaters and heating stoves together were 30 percent of home heating fires and 73 percent of the deaths from them. Almost half of heating fires happen from December through February, which is just ahead of us.

If the counter circuit can't carry the heater along with what you cook, the fix is a new 20-amp circuit. That's panel work, and it's a job for a licensed electrician. Most jurisdictions require a permit for it.

Prices checked in 2026 vary widely:

  • Simple job: one contractor page puts a straightforward 20-amp circuit at $200 to $500, when the panel has open slots.
  • Typical range: Angi, updated May 2026, reports a $250 to $1,100 range with an average of about $700. Inspection adds $100 to $400.
  • Bigger panel work: if the panel is full, a subpanel runs about $1,000 to $2,000, and a full panel replacement runs $1,200 to $2,000.

What drives the price is how far the outlet is from the panel, whether the electrician has to run wire through finished walls, and whether the panel has room for another breaker.

Related: Creaks, Bangs and Knocks at Night: Which House Noises Are Normal

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