When preparing your home for emergency power outages, choosing the right generator is just one piece of the puzzle. Equally important—but often overlooked—is knowing how to protect your home and family from fire risks associated with generator use. That leads to an essential safety question: What type of fire extinguisher should be used with a generator?
The short answer: For most residential generator applications—whether portable or standby—you should have a Class B:C or ABC fire extinguisher nearby. These extinguishers are specifically rated to handle flammable liquids (like gasoline or diesel) and electrical fires, which are the two most common types of fire risks when using generators.
This guide will explain the fire risks associated with generators, the differences between fire extinguisher classes, the best extinguisher types for generator use, and proper placement and maintenance practices to ensure you’re prepared during emergencies.
Why You Need a Fire Extinguisher for Your Generator
Generators—whether gasoline, diesel, propane, or natural gas-powered—can be potential fire hazards if not operated or maintained properly. Even solar battery-powered generators have some risk of electrical malfunction or overheating.
Common Fire Hazards When Using a Generator:
- 🔥 Fuel spills during refueling
- 🔥 Leaking gas or propane lines
- ⚡ Electrical short circuits or overloads
- 🌡️ Overheated engines or exhaust components
- 🧯 Generator placement near flammable materials
Having the right type of fire extinguisher within reach is critical to responding quickly before a small issue becomes a disaster—especially during an emergency situation where fire department response may be delayed.
Understanding Fire Extinguisher Classes
Not all fire extinguishers are created equal. Each type is designed to combat different categories of fire, known as fire classes:
| Class | Type of Fire | Examples |
|---|---|---|
| Class A | Ordinary combustibles | Wood, paper, cloth |
| Class B | Flammable liquids | Gasoline, diesel, oil, propane |
| Class C | Electrical equipment | Wiring, generators, appliances |
| Class D | Combustible metals | Magnesium, lithium (not typically household) |
| Class K | Cooking oils & fats | Kitchen fires, grease |
💡 Generators pose Class B and Class C fire risks, so you need an extinguisher that can handle both flammable liquids and electrical equipment.
Best Fire Extinguishers for Generator Safety
✅ Class B:C Fire Extinguishers
These extinguishers are ideal for generator setups and are specifically rated to handle gasoline, diesel, oil, and electrical fires.
- Do not conduct electricity
- Compact and easy to store near portable units
- Commonly filled with dry chemical (sodium bicarbonate)
✅ ABC Fire Extinguishers (Multi-Class)
These are the most versatile and widely recommended for general home use. In addition to generator fire risks (Class B:C), they also handle Class A fires—making them ideal for indoor areas near generators.
- Filled with monoammonium phosphate powder
- Can handle electrical shorts, fuel fires, and flammable debris
- Common in homes, garages, and workshops
💡 Best Practice:
Keep at least one 5-pound ABC fire extinguisher rated 3-A:40-B:C within 10–15 feet of your generator. Larger standby units may benefit from a 10-lb extinguisher mounted near the installation site.
Top Recommended Fire Extinguishers for Generator Use
1. First Alert PRO5 Rechargeable ABC Fire Extinguisher
- UL Rated 3-A:40-B:C
- 5-lb dry chemical unit with metal valve construction
- Rechargeable and approved for home and garage use
2. Kidde FA110 Multi-Purpose Fire Extinguisher
- UL Rated 1-A:10-B:C
- Affordable, lightweight option for small generator setups
- Perfect for portable generator storage boxes or sheds
3. Amerex B402 ABC Fire Extinguisher
- Commercial-grade model for larger systems
- UL Rated 3-A:40-B:C
- Durable aluminum cylinder with wall bracket
Proper Fire Extinguisher Placement and Storage
Even the best extinguisher won’t help you if it’s not accessible when fire strikes. Follow these placement guidelines for maximum effectiveness:
- 📍 Store the extinguisher within 10–15 feet of the generator
- 🧯 Mount to a wall or store in an outdoor-rated cabinet if outside
- 🚪 Keep a second unit inside the home near the nearest exit
- 💡 Avoid storing directly ON the generator or near exhaust ports
Tip: If your generator is in a detached shed or enclosure, install a fire extinguisher inside and outside the entry point.
How to Use a Fire Extinguisher (PASS Technique)
Make sure everyone in your household knows how to use a fire extinguisher. Use the PASS technique:
- P – Pull the pin
- A – Aim at the base of the fire
- S – Squeeze the handle
- S – Sweep side to side
Always maintain a clear exit route, and if the fire grows beyond control in seconds—evacuate and call 911.
Generator Type and Matching Fire Extinguisher Risks
| Generator Type | Fuel Type | Recommended Extinguisher |
|---|---|---|
| Gasoline Portable Generator | Class B + C risk | 5-lb ABC or BC dry chemical |
| Propane Generator | Class B + C risk | 5- or 10-lb ABC extinguisher |
| Diesel Generator | High Class B risk | 10-lb BC or ABC commercial extinguisher |
| Solar Generator (Battery-Based) | Class C risk | Clean agent or ABC extinguisher |
FAQs: Fire Extinguishers and Generators
Q: Can I use a water extinguisher on a generator fire?
No. Water conducts electricity and can make electrical or fuel-based fires worse. Only use dry chemical or clean agent extinguishers rated for Class B:C or ABC.
Q: How often should I check my fire extinguisher?
Monthly. Ensure the pressure gauge is in the green zone, and that the nozzle, safety pin, and handle are in working condition. Replace or recharge after any use.
Q: Should I keep an extinguisher with my portable generator?
Yes. Whether you use your generator at home, in a garage, or during camping/boondocking, always bring a fire extinguisher with you.
Q: Are CO2 extinguishers good for generators?
CO2 (carbon dioxide) extinguishers are excellent for Class C electrical fires, but less effective for flammable liquids. An ABC dry chemical unit is more versatile for generator use.
Conclusion: Choose the Right Fire Extinguisher to Stay Safe With Your Generator
A generator is an essential backup power tool—but it comes with real fire risks. Whether you’re using a gas-powered portable unit or a whole-house standby generator, you must have the right type of fire extinguisher nearby.
Choose a Class B:C or ABC-rated extinguisher, store it close to your generator, and check it regularly to ensure it’s ready to go in an emergency. It’s a small investment that could make a life-saving difference when seconds count.
Want to Learn More About Generator Safety?
Check out our guide: Where Should a Generator Be Placed for Safety and Code Compliance? — essential tips for safe operation and home protection.