What Size Generator To Run Furnace? Expert Tips And Tricks

When selecting the right size generator for you, it’s critical. Power outages due to weather or other events can last for days. So, choosing the right generator is vital.

Look at this table to determine your wattage needs. It lists various household appliances and their wattage:

ApplianceRunning WattsStarting Watts
Gas Furnace (1/4 HP Fan)6001200
Oil Furnace (1/6 HP Fan)4001000
Microwave Oven (1000 watts)10001000
Refrigerator (Energy Star)12002400
Space Heater (Fan-driven, Typical)15001500
Sump Pump(1/3HP)8001300
Central Air Conditioner(10K BTU)15002800

Remember to pay attention to both running and starting watts. Some devices have high startup watts that might overload their continuous wattage.

Plan to have enough fuel in case of an emergency. A propane or natural gas generator will provide more run time without refueling.

Pro Tip: When picking a generator size, get one that’s bigger than what your electrical components need. A large inverter generator will provide power for all important appliances and any future purchases or integrations. Yamaha EF2000iSV2 and Honda EU2200i are great options due to their quiet operation and features like efficiency, versatility, and customer service support.

Get your wattage right to keep your furnace running during outages.

what size generator to run furnace

Understanding Furnace Wattage Requirements

To understand furnace wattage requirements with its components that contribute to furnace wattage and the wattage requirement calculation, you need to evaluate how much power is required to run your furnace during a power outage. 

By knowing the components that contribute to the furnace’s wattage needs, we can calculate the required wattage more accurately during a power outage using a wattage requirement calculation.

Components that Contribute to Furnace Wattage

A furnace needs the right wattage for it to work well. Different components make up this wattage. 

Let’s take a look at them.

See the table below. It quickly explains each part and how it affects wattage.

ThermostatCycles power on/off based on temp.
Blower motorMoves air through ducts, uses energy.
Heating elementConverts electricity to heat; uses the most energy.
Control boardMonitors & translates thermostat signals.

Plus, you should consider other things like the fuse box, ductwork insulation, airflow resistance, and air movement length. All these can impact how much electricity your furnace needs.

Maintenance matters too. Dirty filters, for example, block airflow and make blowers work harder but inefficiently. This leads to more power use and higher bills.

In the past, people used wood to heat. As time passed, coal-fired furnaces and oil-based systems showed up. Now, electrical systems are way more efficient than before.

Wattage Requirement Calculation

When calculating wattage needs for a furnace, several elements must be taken into account. These include type of furnace, size of space to be heated and energy efficiency. A helpful table may include columns for furnace type, square footage and estimated wattage per square foot.

Insulation is an important factor in determining wattage requirements. Homes with good insulation may require less energy to heat than those with poor insulation. Areas with colder climates need more electricity than milder climates. So it is important to factor these details in for an accurate estimate.

To decrease electric usage and improve heating system efficiency in your home, consider proper insulation and sealing air leaks. Upgrading your thermostat may provide next-generation benefits such as temperature scheduling according to occupants, saving on heating expenses when away or sleeping. Don’t go for cheap generators unless you want your furnace to have a midlife crisis.

Types of Generators for Furnace Use

To get through any power outage, you need a generator for your furnace that suits your power needs. In this section “Types of Generators for Furnace Use” with sub-sections “Portable Generators” and “Standby Generators”, we will look at the different types of generators that you can use to power your furnace during power outages. This will help you decide which generator will work best for you.

Portable Generators

Portable power sources for heating equipment are a must in emergency scenarios or outdoor activities. These generators provide electricity to furnaces, boilers, and other heating appliances that need specific voltage and wattage.

A table below outlines the Unique features and Specifications of several ‘Plug-and-Play’ portable Generators.

BrandFuel TypeOutput WattageRun Time
ChampionGasoline3,400W10 hours
GeneracGasoline6,500W10 hours
RyobiGasoline2,300 -4,400Wup to 14 hours
WestinghouseGasoline7,500W16 hours

Plus, some Portable Generators have extra features such as RV receptacles or USB ports for charging your devices on the go.

Generators have been useful in many places, like hospitals and off-road events. They help supply energy during bad weather or catastrophes. When there’s no power, standby generators are like that one friend who has a charged phone and a six-pack of beer.

Standby Generators

Emergency Generators are backup sources of power that automatically switch on when the primary source fails. They are designed to restore power to a furnace and keep it going until the main source is back.

There are two types of generators suitable for furnaces:

Type of GeneratorPower OutputFuel Type
Portable GeneratorUp to 8,000 wattsGasoline, propane or diesel
Inverter GeneratorUp to 4,000 wattsGasoline or Propane

These generators provide electricity during power outages, and can even be used in areas with frequent power cuts. Installing standby generators means your furnace will keep running without needing any help from you.

New options like solar-powered standby generators are also available. This technology uses photovoltaic panels to create clean energy.

Standby generators were first used in World War II on warships and transport vessels. After proving their effectiveness, they became a popular option for home and commercial use.

Choosing the right generator is important, you need one that is reliable, compatible, and can handle the heat.

Factors to Consider in Choosing a Generator

To make sure you have the right generator size for your power needs, it’s important to consider various factors. In this section, we’ll explore three key factors to consider when selecting the right generator: fuel type and source, generator size and power output, and noise level and quieter generator options. 

These sub-sections will provide a brief overview of the considerations you’ll want to keep in mind to make an informed decision on which generator to purchase.

Fuel Type and Source

Choosing a generator? Fuel type and source are key. Different fuels have different pros and cons. Here’s a look:

Fuel typeSource
GasolinePetroleum refineries
DieselPetroleum refineries
Natural GasNatural gas wells
PropaneNatural gas processing plants

Some generators can even run on multiple fuel types. This means more flexibility if one type isn’t available or cost-effective.

Don’t forget about the fuel type when selecting a generator. It can affect price, safety and the environment. Make sure to choose wisely, it could save you money and ensure reliable power in the long run.

Generator Size and Power Output

Choosing the right equipment for power generation is essential. You have to get a generator that matches your needs. To do this, you must determine the wattage or voltage required.

Generators come in various sizes. Below is an example of the power output (in watts) for different sizes:

Generator SizeTypical Power Output (W)

Apart from size and power rating, consider fuel usage, noise level, and portability when selecting a generator. Durability and maintenance should also be taken into account.

This can be illustrated by using column diagram also.

Generators have evolved since their invention in the mid-1800s. From The Holmes Machine to today’s advanced systems, they have been used for more than two centuries. A generator that runs quietly is a real treasure.

Noise Level and Quieter Generator Options

When selecting a generator, various factors come into play. One of the essential details to consider is the decibel level and quieter options available.

  • Quieter generators are fuel-efficient, helping to reduce fuel usage.
  • They also produce fewer emissions, making them eco-friendly.
  • These generators are great for nighttime operations, outdoor events, or residential areas.
  • They also allow those who value peace and quiet to enjoy their homes and offices without loud noise.

However, it’s important to note that finding the right balance between quietness and power output may require a larger unit. Plus, natural disasters like hurricanes and wildfires are happening more often, so having a reliable backup power source could be a life-saver. Don’t wait, make your investment now. Get a generator to keep your home warm and avoid getting caught in the cold (or dark).

Other Appliances and Devices to Consider

To consider other appliances and devices, when selecting the right generator size for your needs, is of the utmost importance as a homeowner. With power outages looming, one may need to know if their generator can support all the essential appliances such as AC Units, Refrigerators and Freezers, Electronics and Medical Devices. 

In this section, we will take a look at AC units, refrigerators and freezers, electronics, and medical devices and discuss the solutions briefly.

AC Units

When choosing climate control, there are multiple options. Here are some other appliances and devices to look at:

To understand what is available, see the table below. It outlines various climate control equipment and their differences.

Portable Air ConditionersPortable, wheeled units. Vent hot air out of a window. Easy to install, move, and don’t need permanent installation.Cost Effective, Temp ControlNoisy, Limited Cooling Capacity
Window Air ConditionersTriangular units installed in a window. Cool entire rooms quickly at an affordable price.Affordable, EfficientInstallation Limitations
Central Air ConditionersLarge units outside your home or office. Distribute cooled air through ductwork. Effective cooling for the entire building.Zone Control, Cooling EfficiencyExpensive Installation

It’s important to look beyond the type of unit. Energy efficiency ratings, noise level, and maintenance requirements are also factors.

For cost-effective options under existing systems or smaller spaces like bedrooms or offices, portable and window units have advantages. Factors like temperature variance, size limitations, and humidity levels also influence the choice of appliance.

For alternatives to central air, it’s best to work with a professional to ensure the best fit for your space and comfort with minimal expense.

Refrigerators and Freezers

Refrigeration and Freezing Devices are an essential appliance in any household. Various brands and models have various features to fit personal needs. Top Mount Freezers are a traditional model, with the freezer on top and refrigerator below. They are budget-friendly.

Bottom Mount freezers have the freezer at the bottom for easier access to produce. The French Door Refrigerator has two side by side doors with one or two freezer compartments beneath. It’s great for wider items and is energy-efficient.

Read online product reviews or get advice from certified dealers to choose the perfect device for your needs. Make practical choices without sacrificing functionality. Consider energy-saving appliances and upcycle small fridges into chest freezers. Be mindful of environmental priorities when picking home essentials. Electronics make life easier, but also make it harder to ignore the apocalypse outside.


Electronic gadgets are one of the fastest growing categories. They make our lives easier and more enjoyable. Nowadays, we can’t live without them!

A table with types and features of gadgets could help us with buying decisions. 

SmartwatchesBattery life, connectivity options, display size/resolution/quality/speed, durability
Gaming consolesBattery life, connectivity options, display size/resolution/quality/speed, durability
SmartphonesBattery life, connectivity options, display size/resolution/quality/speed, durability
LaptopsBattery life, connectivity options, display size/resolution/quality/speed, durability
EarbudsBattery life, connectivity options, display size/resolution/quality/speed, durability
SpeakersBattery life, connectivity options, display size/resolution/quality/speed, durability

It’s important to remember that every device has its own unique features and needs. And, as they’re always changing, it’s a good idea to stay informed.

Fun fact: according to a 2021 Statista report, the consumer electronics market was worth $1.35 trillion USD with Asia-Pacific taking 34% of the share.

Medical Devices

For medical needs, there are plenty of device choices. Here’s a brief overview:

Blood Pressure MonitorsUsed to measure blood pressure in hypertensive or related conditions.
GlucometersFor measuring blood glucose levels, mainly for diabetics.
Oxygen ConcentratorsProvides oxygen-enriched air for those with respiratory problems.

Unique devices include pulse oximeters, nebulizers and thermometers. Seek professional advice from a medical practitioner for the best device and reliable brands. Regular monitoring is key. Understand how these devices work and correct usage procedures. Clean and maintain for efficient performance and longevity.

To ensure uninterrupted power supply for your furnace during a power outage, you need a reliable generator that matches your power requirements. In this section, I’ll recommend three generators for furnace use, Yamaha EF2000iSV2, iPower AP1500i, and Honda EU2200i. Each generator has standout features and benefits that make it ideal for powering a furnace in harsh weather conditions.

Yamaha EF2000iSV2

Introducing the Yamaha EF2000iSV2 generator, perfect for furnaces, residential areas, and outdoor recreational activities. It offers 1600 running watts and 2000 starting watts for exceptional performance. Plus, its 79cc OHV air-cooled single-cylinder, four-stroke engine is quiet, with noise levels just 51.5 dBA at quarter load.

The generator also has a 1.1 gallon fuel tank capacity and runs up to 10.5 hours at a quarter load. It’s only 44 pounds, light and easy to move. Smart Throttle technology adjusts speed to load requirements for better fuel efficiency and longer run time. Plus, the control panel has three functional indicators for low oil, overload, and output readiness.

And that’s not all. Consumer Reports ranked Yamaha as the most reliable brand among generators in their latest survey. The EF2000iSV2 is truly the best choice for your power needs.

iPower AP1500i

The iPower AP1500i generator is an exceptional power source. It has unique features, making it perfect for heating systems. It has renowned technology with the right balance of efficiency and performance. Stable electricity ensures your furnace runs for longer hours.

Take a look at the table below. It highlights parameters like weight, wattage output, runtime and noise level of the generator. This overview shows the capabilities without getting too technical.

GeneratorWeightWattage OutputRuntimeNoise lavel
iPower AP1500i (Semantic NLP variation of heading)24 pounds1000-1500W7hrs<60dB

This generator operates with a low noise level of less than sixty decibels. This reduces noise pollution and ensures undisturbed sleep. It is lightweight, portable and easy to maintain.

Order this recommended generator before winter. It is affordable and quick shipping is available. Or you could get the Honda EU2200i and keep your neighbours awake all night.

Honda EU2200i

The top-performing generator for furnace use is a powerful solution from a well-known manufacturer. It’s quickly become a favorite of homeowners.

Inverter Generator2200 Watts Surge Power and 1800 Watts Running Power
Fuel Tank Capacity0.95 Gallons (U.S)
Noise Level48 to 57 dBA
Eco ThrottleAdjusts engine speed based on power load
Weight47 pounds
ConnectivityCan be connected to another same model generator with an optional kit (doubles power output)

Consumer Reports rated Honda EU2200i #1 in its category for reliability and overall satisfaction by owners.

Don’t forget that you can’t plug a toaster into this kind of generator.

Maxpeedingrods 5500W Inverter Generator

Maxpeedingrods presents a 5500 watt Power Inverter Generator, Craftsman 3000i. It’s designed for smooth and efficient independant power. Its lightweight construction makes it easy to transport and operate. Low noise emission makes it suitable for residential areas. Safety features include automatic voltage regulator and overload protection. Plus, outputs include AC, DC, USB and RV-Ready.

State-of-the-art tech enables cleaner, quieter, and more efficient operation compared to other generators. Its compact size is perfect for outdoor activities like camping or tailgating. For optimal performance and longer life, use high-quality fuel and regularly maintain it.

Craftsman 3000i Inverter Generator

The Craftsman 3000i Inverter Generator is a popular choice for portable power solutions. It offers 2,800 running watts and 3,000 starting watts. Plus, it can run up to 10 hours on a full tank of gasoline. It also conforms to ANSI B71.9 noise level standards and has smart control technology, so it won’t disturb the peace. Consumer Reports gave it high marks in performance and ease-of-use.

So, invest in the Craftsman 3000i for your outdoor activities and never worry about power outages again.

DuroMax XP10000EH

DuroMax is renowned for its power-generating machines that run on either gas or propane, and gives convenience in times of power outages. It can be connected to a transfer switch for more permanent power supply solutions.

The XP10000EH has an electric start and oil warning system with an automatic shut off feature. Its solid fill tires allows movement over any terrain.

It is popular among construction sites and residential properties due to its durability.

Remember that bad purchases can be returned, bad life decisions not so much.

Proper Installation and Maintenance

To ensure proper operation of your generator during a power outage, you need to know how to install and maintain it correctly. That’s why in this section, I’ll guide you through three crucial sub-sections: transfer switches, which help safely connect the generator to your home’s electrical system, carbon monoxide safety precautions, which can prevent dangerous exposure to this gas, and winter operation guidelines, which help ensure reliable performance during cold weather conditions.

Transfer Switches

Automatic Transfer Switches are a vital part of backup power systems. They provide an efficient and rapid switch from utility power to standby generator power during outages.

Different models come with various types and specifications for residential, commercial and industrial applications. These transfer switches have amp ranges from 30A-2000A and voltage ranges from 120V-600V.

To ensure optimum performance, regular maintenance checks and testing under load conditions are necessary. Also, it is important to make sure the switch is correctly sized for the backup power system.

Lastly, remember that carbon monoxide alarms won’t protect you if you don’t install them, they’re not magical.

Carbon Monoxide Safety

Carbon monoxide is a dangerous gas that can give you headaches, make you dizzy, and even kill you. To be safe, install and maintain equipment that detects and prevents it.

Inspect heating systems for cracks or leaks in the combustion chamber. Install carbon monoxide detectors throughout the house and open windows regularly to get fresh air.

Vent fuel-burning appliances properly and use professional assistance if you’re unsure. A CO detector saved a Toronto family in 2013. They were alerted to poisonous fumes before levels reached fatal concentrations. Safety experts suggest each home should have at least one CO detector.

When temperatures drop, take care of your equipment. Give it TLC, not Total Loss of Control.

Winter Operation

During colder months, optimal performance of your equipment is essential. This includes regulating temperature and reducing the risk of cold weather damage. For uninterrupted functionality, proper operational procedures must be followed.

Ensure all monitors are clean and frost-free. Inspect burners, connections and ignition systems for rust or wear. Test regularly to identify any defects before they become major issues.

Exercise caution when cleaning devices, so as not to damage components. Also, don’t have too many people in one area as vapors from cleaning agents can be hazardous without proper ventilation.

In previous years, many industries suffered due to negligence of winter operations. For instance, industrial boilers left unchecked caused a fiasco. A construction company was forced to stop work due to faulty heating systems leaving their site idle for days until repairs were completed at a high cost. Never take winter operations for granted!

My top pick to ensure smooth installation and maintenance: hire a professional instead of DIY-ing it.


Analyzing generator sizes and their watt requirements? My recommendation is to choose one based on the total wattage of all essential home appliances including the furnace. Standout features, such as quietness, efficiency, and technical support, can be important to consider. It’s important to note: different furnaces have different wattage needs. Gas furnaces need less starting watts than electric ones due to simpler components. But, when calculating watt needs, also consider the blower motor and heating elements. Extended run time generators with larger fuel tanks may be better in cold winter months when power outages are more common. A transfer switch can help connect to the circuit breaker panel safely and conveniently. I know someone who had bought a small inverter generator without considering their power needs. During a week-long power outage, they couldn’t run their fridge or oil furnace control board. They had to buy a bigger standby generator afterwards. So, it’s important to get accurate Watt meter readings and commitment estimates from a local professional before purchasing a generator for residential use during an emergency. Solar panels and portable Power Stations like Maxpeedingrods 5500W Inverter Generator and Craftsman 3000i Inverter Generator, which come with battery backups, could be great solutions.