Craver ElectricIf your electric space heater is tripping the breaker in your Garner, NC home, you are not alone, it is one of the most common electrical complaints we hear from homeowners in older Garner and Raleigh neighborhoods once the temperature drops. You plug in a space heater on the first cold night of fall, and within twenty minutes the breaker trips. You reset it. It trips again. It feels like the heater is the problem. Usually, it is not.
Here is what is actually happening, and how to figure out whether a simple fix or a panel upgrade is the right answer for your house.
#How Much Power Does a Space Heater Actually Draw?
A typical portable electric space heater set to its highest setting draws 1,500 watts. On a standard 120-volt circuit, that works out to 12.5 amps. Most bedroom and living room circuits in older homes are 15-amp circuits. That means the heater alone is using roughly 83 percent of the circuit's total capacity before you turn on a single lamp, charge a phone, or run anything else.
The National Electrical Code (NFPA 70) has long required that continuous loads, meaning loads running for three hours or more, not exceed 80 percent of a circuit's rated capacity. This rule exists specifically because circuits running near their rated limit for extended periods generate heat in the wiring and connections.
A space heater on a 15-amp circuit is already sitting right at that line. Add anything else and you are over it.
#Why Do Older Panels Make This Worse?
Breakers are mechanical devices. They trip by sensing heat or excess current and physically snapping open. Every time a breaker trips, the internal mechanism takes a small amount of wear. In a panel that is 30, 40, or 50 years old, some of those breakers have tripped hundreds of times, or they have simply sat in a warm, humid panel enclosure for decades.
Old breakers can do two dangerous things. First, they can become hypersensitive and trip at loads well below their rating. That is annoying, but it is actually the safer failure mode. Second, and much worse, they can lose their ability to trip at all. A breaker that will not trip under overload is no longer protecting the circuit. It is just a switch.
If a breaker in your panel feels loose when you flip it, does not click firmly into the ON position, or feels warm to the touch on the outside of the panel cover, those are signs the breaker itself needs to be replaced regardless of what is tripping it.
Garner and the surrounding areas south of Raleigh have a lot of housing stock built in the 1960s through the 1980s. Many of those homes have 100-amp panels, which was appropriate for the electrical loads of that era. Homes did not have electric dryers, two refrigerators, large televisions, computers, EV chargers, and portable heaters all running at once. The panel was not built for this. If your home is in this category, panel upgrades and rewiring may be worth exploring before winter settles in.
#What Is the Difference Between a Tripped Breaker, a Weak Breaker, and an Overloaded Circuit?
These three things look identical from the outside but have different fixes, and confusing them leads to money wasted on the wrong repair.
| Cause | What it means | What fixes it |
|---|---|---|
| Overloaded circuit | Too much total draw on the circuit from multiple devices, including the heater | Move the heater to a different circuit, or reduce other loads on the same circuit |
| Weak or failing breaker | The breaker trips at loads it should handle because the mechanism has worn or corroded over time | Replace the breaker; the circuit itself is fine |
| Undersized panel | Multiple circuits are near capacity because the total panel amperage cannot support current household loads | Panel upgrade to 150- or 200-amp service |
The practical way to sort this out: if only one breaker is giving you trouble and the rest of the panel is behaving normally, start by having that single breaker replaced. It is a much smaller job. If you are seeing the same pattern across several circuits, or if the panel is old enough that you do not know the last time anyone looked at it, a full panel inspection makes sense before you spend money chasing individual breakers. Our electrical repair and troubleshooting service covers exactly this kind of diagnosis.
#When Does a Panel Upgrade Become the Practical Answer?
Replacing one breaker costs a fraction of a panel upgrade. But there are situations where patching individual breakers is the wrong approach.
- The panel is a brand known for problems, such as Federal Pacific or Zinsco. These panels have documented failure rates and most electricians will not simply replace breakers in them.
- You are planning to add other high-draw circuits in the near future, such as an EV charger, a hot tub, or a whole-home generator transfer switch.
- The panel is already maxed out with no open slots, meaning there is no room to add a dedicated circuit for the heater.
- Multiple breakers are failing at the same time, which points to age and environment rather than a single defective breaker.
- The main breaker itself is showing signs of weakness, which puts the entire panel at risk.
A dedicated 20-amp circuit for a space heater solves the headroom problem. On a 20-amp circuit, the same 1,500-watt heater runs at about 62 percent capacity, well within the 80 percent continuous load guideline. If the panel does not have room for a new circuit, or if the panel upgrade is coming anyway, it makes more sense to do it once correctly rather than paying for two separate jobs a year apart.
Portable electric heaters are not designed for continuous, season-long use on shared bedroom circuits. If you are relying on one to heat a room that should be conditioned by your HVAC system, the electrical fix is only part of the answer. An HVAC inspection to check for duct or airflow problems in that room is worth adding to the list.
#What Should You Check Before Calling an Electrician?
Try the heater on a different circuit in a different room. If it runs without tripping, the problem is specific to that one circuit. Check the breaker by resetting it firmly; sometimes a partial trip leaves the breaker in a middle position that looks on but is not fully reset. Look at the panel from the outside for any signs of rust, moisture staining, or a burnt smell near the panel door.
If the heater trips the breaker in every room you try it, the heater itself may be faulty. Borrow a different heater and test again. A consistently tripping breaker that clears when the heater is unplugged but trips with any heater you put on it is a circuit problem, not a heater problem. At that point it is worth having someone open the panel and look at both the breaker and the wiring connections.
#Common Questions
Can I just use a higher-rated breaker to stop the tripping?
Swapping in a larger breaker, say a 20-amp in place of a 15-amp, is dangerous and should not be done unless the wire on that circuit is rated for the higher current. The breaker protects the wire, not the device. If the wire is 14-gauge, which is standard on 15-amp circuits, putting a 20-amp breaker on it means the wire can overheat and start a fire before the breaker ever trips. The fix is a dedicated circuit with properly rated wire, not a larger breaker on existing wire.
Is it safe to run a space heater through a power strip or extension cord?
Most power strips and household extension cords are not rated for the sustained current draw of a 1,500-watt space heater. Running a heater through one can overheat the cord or strip long before any breaker trips. Space heater manufacturers consistently recommend plugging the unit directly into a wall outlet, and most fire safety guidelines say the same. If your only available outlet is too far away, the right answer is adding an outlet, not extending with a cord.
How do I know if my panel in my older Garner or Raleigh home needs to be replaced rather than repaired?
A panel inspection by an electrician will give you a clear picture, but a few things point toward replacement rather than repair: the panel is a Federal Pacific Stab-Lok or Zinsco brand, the main breaker is failing, there are no open slots for new circuits, or more than a couple of breakers are showing signs of weakness at the same time. A panel in otherwise good condition with one or two problem breakers is usually worth repairing. A panel that is 40-plus years old with several issues is usually more cost-effective to replace, especially if you have plans to add circuits in the next few years anyway.
What size panel do most older homes need when upgrading?
Most electricians recommend a 200-amp panel for a single-family home today, even if your current load does not require it. The reason is headroom for future circuits, including EV chargers, which can draw 40 to 50 amps on their own. Going to 150-amp saves a small amount upfront but can mean doing the job again in five years. The U.S. Department of Energy notes that EV adoption continues to accelerate, and homes that already have upgraded electrical service are better positioned to handle charging without additional service upgrades.
If your breaker is tripping every time you run a space heater this fall, Craver Electric works on residential panels and circuits in Garner, Raleigh, NC, and the surrounding area. Take a look at what your panel is doing before the cold weather settles in for good, and we can tell you whether a single breaker swap or a full upgrade makes more sense for your house. Request a quote to set something up.