Space heaters blow fuses due to excessive power draw, faulty wiring, or using an overloaded circuit, leading to overheating and potential fire hazards.
Space heaters blowing fuses is a common winter headache. These powerful devices demand significant electricity, often pushing circuits beyond their limits. Understanding why this happens and how to prevent it keeps your home warm and safe.
Top Reasons Space Heaters Trip Breakers
Space heaters consume substantial power, making them prone to overloading circuits. Here are the primary causes of blown fuses:
1. Circuit Overload
Most space heaters draw 1,500 watts on high settings. On a standard 15-amp circuit, this leaves little room for other devices. Plugging additional appliances into the same circuit often triggers overloads.
2. Old or Faulty Wiring
Older homes may have wiring that can’t handle modern electrical demands. According to the National Fire Protection Association, faulty wiring causes many heater-related fires.
3. Undersized Circuit Breakers
Some circuits use breakers rated below what the wiring can safely handle. This creates unnecessary tripping. Always consult an electrician before upgrading breakers.
How to Prevent Space Heater Fuse Problems
Check Your Heater’s Wattage
Calculate the current draw:
| Wattage | Voltage | Amps |
|---|---|---|
| 1,500W | 120V | 12.5A |
| 750W | 120V | 6.25A |
Follow These Safety Steps
- Plug heaters directly into wall outlets
- Use dedicated circuits when possible
- Upgrade to low-wattage models for problem areas
- Never use extension cords unless absolutely necessary
When to Call an Electrician
Contact a professional if you experience:
- Frequent breaker trips with minimal load
- Burning smells from outlets
- Discolored or warm wall plates
- Need for new circuits to support heating needs
Alternative Heating Solutions
For persistent electrical issues, consider:
- Propane space heaters for temporary use
- Radiator-style units with lower surge currents
- Zoned central heating upgrades
The Electrical Safety Foundation International recommends space heaters account for no more than 80% of a circuit’s capacity. This margin prevents overheating and reduces fire risks.
Understanding Your Home’s Electrical System
Most homes have multiple 15-amp circuits. Each can handle about 1,800 watts safely. Since space heaters often use 1,500 watts, little capacity remains for other devices on the same circuit.
Circuit Mapping Tips
To identify which outlets share circuits:
- Turn off one breaker at a time
- Test nearby outlets with a lamp
- Label circuits for future reference
This simple process helps distribute electrical loads more effectively when using space heaters.
