How to Determine the Right Generator Size for Your Gas Furnace

Ensuring that your home remains warm and comfortable during power outages can be a matter of climate, safety, and necessity. One common concern is determining the appropriate generator size to power a gas furnace. This guide aims to help you understand the key factors involved. From furnace power requirements to starting and running wattages, we'll walk you through a comprehensive process to make an informed decision.

Furnace Power Requirements

Most gas furnaces require a small amount of electricity to power the blower motor, controls, and the ignition system. These typically range from 500 to 1500 watts. However, understanding the specific wattage your furnace needs is crucial.

Starting vs. Running Wattage

It's important to differentiate between starting and running wattages. Many appliances, including furnace motors, require a higher wattage to start than to run. For instance:

Furnace blower motor: 1200 watts running, 2000 watts starting.

Understanding these differences can help in calculating the total power required more accurately.

Additional Loads

Other appliances and systems in your home can also draw power. Consider the following:

Refrigerator: 1000 watts Lighting: 250 watts (example)

Adding these additional loads to the furnace's requirements can help you determine the total wattage needed.

General Recommendations

Minimum Generator Size

For a typical gas furnace, a generator with a minimum capacity of 3000 watts is recommended to handle the furnace and some additional loads. This ensures you can maintain comfort while ensuring your key appliances and systems continue to function. Here's a breakdown:

Furnace blower motor: 1200 watts running, 2000 watts starting Refrigerator: 1000 watts Total: 3000 watts

Preferred Generator Size

If you intend to power multiple devices or want extra capacity, opt for a generator in the range of 5000 to 7000 watts. This provides a comfortable margin and ensures you're prepared for various scenarios.

Final Note

Always verify the specific requirements of your furnace. Manufacturers' documentation can provide exact wattage needs, and consulting it can prevent any potential issues.

Conclusion

Selecting the right generator size for your gas furnace is crucial. By considering the starting and running wattages, along with additional loads, you can ensure a reliable and comfortable environment during power outages. Always refer to your furnace's documentation and consider seeking professional advice if needed.