What Size Generator To Run Furnace In 2022?

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Wondering what size generator to run furnace so your family can feel warm and remain safe throughout the winter months? In this post, we will find out what the right size generator is to operate a furnace and suggest a different type of generator that is suitable for the furnace.

What Size Generator To Run Furnace?

Generally, the starting wattage required for a furnace is 1600 watts, while the running wattage is 600 watts. So the right size generator for a furnace means having a generator that delivers more power than these starting and running wattages.

Size	Starting Wattage	Recommended Generator
Minimum	1800	WEN 56180 1800-Watt Portable Generator
Medium	2000	A-iPower Portable Gas Powered Inverter Generator
Large	2500	Champion Dual Fuel Portable Inverter Generator

Determining How Many Watts Does a Furnace Use?

A right-sized generator for a furnace means choosing a generator that can efficiently run a furnace. Hence, wattage is a vital consideration when it comes to opting for the right size generator.

In general, most home furnaces use 3500 to 5000 watts of energy, which translates into 20 amps at 240 volts or 12 amps at a 120-volt circuit.

The best way to determine the required watts for your furnace is to check the user manual of the furnace.

The user manual may include the model number and either input voltage or output voltage. Using this information, you can calculate the required watts for a certain furnace. The formula is:

Volts x Amps= watts

So if your furnace has a 20 amp draw and runs on 240 volts, then the required watts will be:

240V x 20A = 4800Watts.

In this case, if your furnace uses 12 amps per 120-volt circuit, you will require 250-300 amps at 240V or 167 amps at 120V. It means a generator that can produce 300 amps or higher will be the right option to go for.

Types of generator for running the furnace

Generators that can run a furnace are:

Gasoline Generators

It’s the most compact and cheapest type of generator that also produces less power compared to its other counterparts. But when it comes to choosing the smallest generator, make sure it can produce enough power to keep the furnace running.

Natural Gas Generators

This natural gas generator is the best choice for the furnace. This type of generator doesn’t need to be refueled frequently while producing greater wattage than gasoline or diesel models. It does, however, cost a considerably higher price.

The power output of a natural gas generator ranges from 5000 to 30,000 watts, making it perfect for covering all requirements.

Diesel Generators

This diesel generator is also a popular option for running furnaces. This type of generator is broadly available and able to produce the same power as natural gas generators while coming at a relatively lower cost.

The power output of the diesel generator ranges from 7000 to 45,000 watts, making it suitable for running furnaces and other appliances at the same time.

A few safety tips to follow to survive a winter power outage for a generator

If you have a gasoline generator, then the best suggestion for you is to place it outside. You should also offer a shelter for the generator that is well ventilated and has a fire-resistant coating.

Using a generator will be a safer way to operate a furnace only if you take the necessary precautions. The following are a few safety guidelines to follow during a winter power outage:

Stay away from the gas

If you inhale, the generator can produce carbon monoxide gas, which can cause serious damage if you inhale. This is safe to use even if placed in a well-ventilated room, keeping the doors and windows open.

Use a carbon monoxide detector

Use a carbon monoxide monitor while operating a generator to prevent the gas from getting into your home. It’s also recommended to place the generator at a safe distance from the house.

Get extra fuel

If you don’t have a power outage problem, get some propane or gasoline to be prepared.

Charge batteries

If you have a solar generator, always keep it charged and store it properly, so you can use it whenever you need it.

Use the right size cord

Use good quality and outdoor safe cord that can properly carry the wattage from the generator to the furnace without getting burned.

Keep the generator parallel

Keeping the generator in parallel will give a power boost that helps run multiple appliances along with the furnace.

FAQs About Right Size Generator To Run Furnace

How Much Wattage Is Required To Run A Home Furnace?

A home furnace is typically a light-duty appliance that doesn’t need much wattage to keep running. Most gas-fired furnaces require around 600 watts of electricity to keep running.

Can A 2000 Watt Generator Run A Furnace?

A 2000 watt generator is powerful enough to run an oil or natural gas furnace. The starting wattage of these furnaces is 1400 watts, and the running wattage is 700 watts. A 2000 watt generator, on the other hand, is capable of running multiple lights, a radiant heater, and a couple of fans.

What Is The Quietest Generator For A Furnace?

When choosing a generator for a furnace or other appliance, the sound level is an important factor, especially for a sensitive family or neighbors. The YAMAHA EF2000iSv2 Gas Powered Portable Inverter will be the right option to keep the environment calm while getting the job done.

Final words

Whether you want to be prepared for a harsh winter or a power outage, a generator is an all-in-one solution. Throughout the guide, we have explained what size generator to run furnace and offered some ideas for determining your own.

Hopefully, getting the right size generator for the furnace will be a straightforward task for you, so you can enjoy warm air on those cold days.