Yes, you can run two space heaters at once, but ensure your electrical circuit can handle the combined wattage to avoid tripping breakers or causing hazards; it’s advisable to check the heater specifications and consult an electrician if unsure.
Running two space heaters simultaneously is possible, but it requires careful consideration of your electrical system’s capacity and safety measures. This guide explains the key factors that determine whether your home can handle multiple heaters without tripping breakers or creating fire hazards.
Electrical Capacity Requirements
The ability to run two space heaters depends on your circuit’s voltage and amperage capacity:
| Circuit Type | Voltage | Max Wattage (80% Rule) | Heater Compatibility |
|---|---|---|---|
| 15A US Circuit | 120V | 1,440W | Two 700W heaters or one 1,500W heater |
| 20A US Circuit | 120V | 1,920W | Two 900W heaters or one 1,500W heater |
| European/UK Circuit | 230V | 3,680W | Two 1,500W heaters easily |
Why Voltage Matters
Higher voltage systems (like Europe’s 230V) allow more wattage at lower amperage. A 1,500W heater at 120V draws 12.5A, while the same heater at 230V draws just 6.5A. This explains why oil-filled radiators and other heaters are easier to run in pairs outside North America.
Safety Considerations
Circuit Overload Risks
Running two 1,500W heaters on a 15A/120V circuit (total 25A draw) will immediately trip the breaker. Even on a 20A circuit, continuous operation near capacity can cause:
- Overheated wiring
- Damaged outlets
- Potential fire hazards
Proper Placement Guidelines
When using multiple heaters:
- Keep at least 3 feet from flammable materials
- Place on different walls when possible
- Use separate circuits if available
- Never use extension cords (direct plug-in only)
Smart Alternatives for More Heat
Lower Wattage Options
Consider these solutions instead of pushing circuit limits:
- Low-wattage space heaters (500-800W models)
- Infrared heaters focused on seating areas
- Oil-filled radiators with thermostats
Zone Heating Strategy
According to U.S. Department of Energy, zone heating with properly sized equipment can reduce whole-house energy use by turning down central heat and warming only occupied spaces.
Real-World Testing Results
Practical tests show:
- Two 750W heaters run safely on 15A circuits
- ECO modes (≤1,000W) allow dual operation
- 240V systems handle multiple heaters easily
One user reported successfully running a 2,500W oil radiator and 800W infrared heater simultaneously on a European 230V circuit (total 13.75A), well below the 15A limit.
Warning Signs to Watch For
Discontinue use if you notice:
- Frequent breaker trips
- Warm outlets or switches
- Flickering lights when heaters cycle
- Burning smells from electrical components
For homes with older wiring, consult an electrician before attempting to run multiple heaters. The National Fire Protection Association reports space heaters cause 43% of home heating fires annually.
