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Best Whole House Generator Reviews 2021

In these difficult times, having a reliable home backup power supply is a must.

In fact, investing in the best whole house generator is one of the smartest decisions you can make now.

After nearly 23 hours of research, we selected the 10 most recommended units for homeowners.

All generators presented in our guide – both portable and standby units – can provide enough power to power nearly the entire household.

In the event of a blackout, they can run all critical home appliances such as refrigerators, freezers, AC, lights, and other essential items.


Westinghouse WGen9500DF

✅ Best Portable Whole Home Generator ✅

12500 starting watts / 9500 running watts
Up to 17.5 hours run time
Dual Fuel – Gas & Propane
Convenient Remote Start
CARB Compliant – good for California

2A-iPower SUA12000E

A-iPower SUA12000E

Best Low Cost Solution

12000 starting / 9000 running watts
Electric Start
Low Price
Long Run Time

3Generac 22KW

Generac 22KW

Best Home Standby Generator

22 kW/ 19.5 kW
Can power a whole large household
Automatic Transfer Switch included
You can monitor it using a smartphone

4Briggs & Stratton 20kW 40346

Briggs & Stratton 20kW 403461
20 kW – will run everything in your houme
Good price / quality ratio
Automatic Transfer Switch included

5Duromax XP12000EH

Duromax XP12000EH
12000 starting watts / 9500 running watts
Dual Fuel
Can run all key appliances in your home
CARB compliant – good for California

6Generac 6462 Guardian Series

Generac 16kW 6462
16kW – good for medium size household
Wi-fi Connection
Can Resist Hurricane Winds
Trusted Brand

7Duromax XP10000E

Duromax XP10000E
10,000 Watts – enough for important appliances
Run time of up to 10 hours
Automatic low oil shutoff system

8Kohler 20RESAL-200SELS

Kohler 20RESAL-200SELS
20 kW – more than enough for a large home
Wi-fi monitoring
Quiet operation

9Generac 7033

Generac 11kW 7033
11 kW – suitable for a small home
Online control with a smartphone

10Generac 5734 GP15000E

Generac 5734 GP15000E

Strongest Portable Home Generator

15,000 Watts – More power than most standby units
No professional installation required
Long run time
Cheaper than standby whole house generators

Top 10 Whole House Generators (Portable and Standby) – Our Reviews

1. Westinghouse WGen9500DF

Westinghouse WGen 9500DFWestinghouse WGen9500DF is an excellent portable backup generator for the home.

Its total power output is 12500 starting watts and 9500 running watts.

That is enough wattage to run all critical household appliances.

You can use this generator to power your refrigerator, freezer, sump pump, window AC and lighting circuits.

This generator is a dual fuel unit.

You can use either gasoline or propane to run it.

Another big selling point of this generator is its very long runtime.

You can expect this generator to run for up to 17 hours on lower loads.

The generator comes with a wide variety of outlets.

The most important one for homeowners is the 120V L14-30R Transfer Switch-ready outlet.

Another feature we love about Wgen9500DF is its remote start.

You can use the remote start key fob to control the unit without leaving the comforts of your home.

The user manual is well written and easy to follow.

Plenty of users reported running this generator pretty much straight from the box.

Given its large size, the WGen 9500DF can get noisy at higher loads. However, it’s still much quieter than most other generators.

You certainly can’t expect it to run noiselessly, though. What you can do is placing it in an enclosure to minimize the noise effectively.

Overall, this is an excellent home generator attracting mainly 5-star reviews from people who’ve bought this and other similar Westinghouse generators.

We would recommend it for every homeowner who needs a reliable backup power supply.

  • Dual fuel
  • Easy setup and maintenance
  • Powerful – 12,500 starting watts is enough for home
  • Good price to quality ratio
  • Very Heavy

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2. A-iPower SUA12000E (Best Value For Money)

A-iPower SUA12000EWhen we first saw this generator online and noticed its low price tag, we were very curious to learn more about this unit.

We saw it receive a lot of positive reviews from the customers who bought it when hurricane Irma struck Florida.

That’s when we decided to give it a closer look.

We’ve found out that the A-iPower SUA12000E proves that a good quality home generator doesn’t have to cost a fortune.

It performs exceptionally well as a home backup power supply.

It features a 459cc four-stroke engine delivering up to 9500 running watts of energy. That is enough power to run the majority of home appliances.

The generator has got a 7.0-gallon heavy duty 100% steel fuel tank. The manufacturer claims that it can provide up to 8-9 hours of run time at 50% load. Surprisingly, a lot of users have reported running it for up to 13 hours before having to refuel again.

Overall, this is an excellent quality generator costing only a fraction of the price of the generators manufactured by more famous brands like Generac or Honda. If you do not want to spend thousands of dollars on a generator that you are only planning to use several times a year in case of an emergency – I honestly recommend you consider getting the A-iPower SUA12000E.

You can read more about it in my detailed A-iPower generator review.

  • Well built steel fuel tank and frame
  • Very good performance – works flawlessly during emergencies
  • Long run time
  • Superb price to quality ratio
  • The manufacturer is little known in the US yet

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3. Generac 22000 Watt 7043 Home Generator

Generac 22000 WattThis 22 kW generator is the most heavily recommended standby generator for any household. It is one of the largest air-cooled home generators currently available on the market.

With its 22000 watts, it is powerful enough to provide energy supply for the entire home, including all significant appliances requiring higher wattage, such as air conditioning, heating, TVs, etc.

Users reported it working fine during multi-hour outages caused by hurricanes or other weather elements.

It comes with a whole house 200 Amp NEMA3 Transfer Switch suitable both for outdoor and indoor use.

What I like is the built-in wi-fi connection allowing you to control the generator with your computer or smartphone. You can also use the dedicated app to monitor the operation status and set up the maintenance schedule.

The generator can safely handle sensitive electronics thanks to its True Power technology which guarantees less than 5% harmonic distortion.

  • Suitable even for the largest homes
  • Can withstand hurricane-strong winds
  • Selt-test mode ensuring that everything runs fine
  • Less than 5% harmonic distortion – safe for sensitive appliances
  • Can stand even more adverse weather conditions
  • Requires regular maintenance and professional checks

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4. Briggs & Stratton 20000 watt whole house generator

briggs & stratton 40346 house generatorThe 40346 is ideal for medium to large homes with 200 amp service and one or two central HVAC units. It comes with the powerful rugged 35HP engine which can be found eg. in tractors. It’s a reliable unit and the weekly diagnostic runs like clockwork.

Some customers suggest in their reviews that the insulation could be a bit better at keeping this generator quieter. That is one minor drawback of this unit.


Installation is not very complicated. However, you’d better bring in an electrician for the final 240v hookup.

A maintenance kit with handy oil and filters is also available as extras, as it is a heater kit that is recommended by those living in colder regions, as the light 5W30 oil can tend toward freezing.

The ability to control the generator straight from your computer is also a major plus.

  • With its 20 kW it is one of the most powerful home standby generators
  • Compliant with the NFPA37 standards – it can be placed as close as 18 inches from your home
  • Good choice for the areas with lower natural gas pressure
  • Automatic Voltage Regulation
  • Overload Protection
  • Could be slightly quieter
  • Engine starters need to be replaced once in a while

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5. DuroMax XP12000EH

Duromax XP12000EHDuromax XP12000EH offers the best of both worlds. You can use two types of fuel to run it. This gives you more flexibility and decreases reliance on one single fuel type.

It can easily run all key appliances in your household.

While dual fuel generators are nothing new, hardly any other hybrid generator can beat Duromax XP12000EH in terms of their performance.

Even when running on LPG, it provides 11400 starting watts and 9025 running watts. That’s enough emergency power for the whole small home or nearly entire mid-sized household. Gasoline would give you 12000 starting watts and 9500 watts at your disposal.

The generator can run for more than 7 hours on propane and 8 hours on a single gasoline tank (at 50% load).

It is a large, heavy-duty 50 amp generator, so obviously, you can’t expect it to run noiselessly. However, it is not very loud for an engine of this size and certainly won’t be a significant disruption in times of emergency. Our suggestion is to place it inside a wooden enclosure to minimize the noise further and protect it from harsh weather.

I highly recommend Duromax XP12000EH as a whole home backup power supply. This is the type of portable generator that can handle even more energy-consuming devices without hiccups.

  • Dual Fuel
  • Solid build
  • Provides enough power to run most household equipment
  • Reasonable Noise Level
  • Very heavy (wheels help a lot in moving it around though)

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6. Generac 16000 Watt 6462 Guardian Series

generac 6462This is a 16000-watt unit, suitable for most of the average size detached houses.

It features a composite mounting pad which can potentially eliminate the need for a concrete base, depending on local ordinances.

It also has a durable metal enclosure rated for 150mph winds – good news for those who live in the hurricane-prone area.

Generac 6462 is rated to operate with lower gas pressures. The runtime test is 12 minutes with options for scheduling weekly, bi-weekly, or monthly.

Professional installation is relatively straightforward with this model. Still, even experienced DIY homeowners might want to pass this one up as some users suggested that the manual leaves a lot to be desired.

Customer service has been reported a little lackluster at times, and you will have to rely on local dealers for assistance. Fortunately, the generator itself rarely causes any problems. For the most part, as long as you have it properly installed and regularly maintained, it kicks in when needed in the event of long-lasting power outages.

Just like other Generac standby generators this model can also be controlled via wi-fi connection with a smartphone or computer. Just don’t forget to keep the wi-fi mode turned on and you’ll be able to control the generator even from hundreds of miles away.

  • Can resist strong winds
  • Wi-fi connection
  • Quiet
  • All-aluminum enclosure
  • Just like other standby generators it requires regular checks

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7. Duromax XP10000E

Duromax XP10000EDuromax XP10000E is a very powerful portable generator. While a lot of people who bought it used it along with demanding jobsite electrical tools (such as MIG welders) it can be also effectively used as an emergency home supply.

It is one of those portable generators which help you set up a complete home backup supply without having to spend serious money on the costly installation of a standby generator. Those who live in disaster-prone states (such as Florida) will surely want to consider this model.

Duromax XP10000E comes equipped with a 9-gallon tank and the 16HP engine capable of running for around 9-10 hours, depending on the load.

It features an automatic low oil shutoff system, which automatically turns the generator off when there is too little oil left for safe operation. This feature helps prevent any severe damage – an often overlooked aspect of generator maintenance.

A good thing about XP10000E is that it’s easy to maintain and clean. It certainly doesn’t require the same level of attention as standby whole house generators.

Overall this is one of the most popular heavy-duty popular generators on the market. It can be an excellent home backup supply providing the necessary power during hurricanes or snowstorms.

Read more about the Duromax 10000 watt generator here.

  • Sturdy steel frame build
  • Large powerful engine
  • Automatic low oil level shutdown
  • Easy maintenance
  • Heavy

  • Setting it up can be difficult (no detailed manual included)

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8. Kohler 20000 Watt Standby Generator

kohler 20 home generator review

This generator comes with a composite noise-dampening enclosure. It indeed runs more silently than some of its competitors.

You can set up online monitoring and text alerts. It is a reliable, robust, and quiet generator that’s well worth the investment.

In the event of a significant power outage, it runs pretty smooth even on higher loads. Some minor adjustments may come along due to slight vibration and known engine throttle problems that can cause dirty power flow. The cause is often a faulty carburetor gasket that’s relatively cheap to replace. Cold-weather users will want to pick up a carburetor heater.

In addition to being very quiet for its size, it also has low levels of harmonic distortion, so you don’t have to worry about running your HD TV or laptops with this unit.

While Kohler is a reputable and trusted manufacturer, several people reported less than ideal customer service as well as a few surprises regarding their warranty or service coverage in some areas.

But if you read the fine print and follow Kohler’s instructions you wind up with an excellent generator that’s almost completely covered by a 5-year warranty.

  • Quiet
  • Online monitoring included
  • Restores power in a little bit more than 10 seconds depending on the load
  • Corrosion-proof enclosure
  • In the event of any problems one has to deal with the local dealers which sometimes can be not very helpful

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9. Generac 11000 Watt 7033

generac 6438 standby generatorThis 11,000 watt air-cooled, V-twin generator is relatively trouble free and runs strong even under the heavy load of a large house with things like pool filter and two-thirds of appliances going.

A 250-gallon tank is recommended for LP as it burns nearly 2 gallons of fuel per hour on a heavy load, though much less if you ease up on the power use.

The routine maintenance of changing plugs and oil is effortless.

It is a little noisy under load but still quieter than a portable generator, and it does what you need it for – power your whole house.

Other than that it has the exact same features as other Generac standby generators which happen to be the best on the market. For those who do not need as much as wattage as 16 or 20kW – this particular model is the optimal choice.

  • Strong durable engine
  • Sturdy aluminum enclosure – can resist severe weather conditions
  • Easy to control thanks to the wi-fi connection
  • Trusted manufacturer
  • Harmonic distortion of less than 5%
  • Might not be suitable for the largest homes with a lot of appliances running simultaneously

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10.Generac 5734 GP15000E

Generac 5734 GP15000EThis is one of the largest and most powerful portable generators on the market. It delivers the wooping 15,000 running watts (15KW) of power making it the ideal solution for those looking for a whole home generator.

With so much power at your disposal, you can run nearly all of your home appliances at once, with only exceptions being some particularly energy-hungry ones like electric clothes driers. Do not try to run them together with an AC, and you’re going to be ok.

This generator features an original Generac 992cc OHVI engine.

It has a built-in automatic low-oil level shutdown mechanism, which automatically turns off the generator if there is not enough oil inside.

The fuel tank is truly enormous – it has a total capacity of 16 gallons. That, depending on the load, is enough to run this generator on single refueling for more than 10 hours.

One serious downside quite a few customers have reported is the poor customer support offered by Generac. The manufacturer often fails to help the client when problems appear, even with the recently purchased generators.

Overall, if it weren’t for the poor customer service, this Generac generator would be higher on my list. However, since I expect the generators to run flawlessly (when everything else does not) and do not want to rely on external companies to help with servicing and maintenance – these kinds of issues decrease its value in my eyes.

Nonetheless, it is still definitely worth consideration, especially by those who are looking for a portable home backup power generator running at no less than 15,000 watts.

  • Very powerful – 15,000 running watts can power an entire mid-sized home
  • Large fuel tank
  • Long run time
  • Customer support reportedly leaves a lot to be desired

  • Expensive

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Portable or standby whole house generator – which one should you get?

That depends on a few factors, but I would personally vouch for a powerful portable generator rated at least 7500 running watts. Why is that?

1. Portable generators are cheaper to buy and much easier to set up

Portable generators cost much less than standby models. They are also less expensive to maintain and do not require any professional installation. You can simply buy one together with a dedicated transfer switch, connect it to your house in the event of a power blackout, fill it with gas, turn it on and you are good to go.

On the other hand, standby generators are not only costly but also require professional installation by a certified electrician. That can add a lot to the overall cost of the whole house generator. The installation of such a generator also requires specific permits in adherence to the local town planning regulations.

Standby generators also require regular maintenance, which does not come cheap either. You should get the generator serviced even after only 24 to 48 hours of continuous use. (source: Popular Mechanics) As you can imagine, this can be a real nuisance in the longer term.

Portable generators are much easier to set up and do not require any advanced knowledge, government permits, nor regular professional maintenance. The only minor issue you might have with them during a blackout is that they can be quite loud. But let’s be honest – in the event of the power outage caused by a hurricane or a forest fire, noise is one of the last things you and your neighbors are going to be concerned about (they’re probably going to use their generators too).

If you’re a California resident, make sure that the generator you buy is CARB compliant.

Remember: NEVER connect a portable generator to your home without a transfer switch! Doing so can cause a serious electric shock and can be potentially fatal. It can also cause major damage to the electric grid in the whole neighborhood.

2. Large portable generators can power nearly the entire house

You should ask yourself – in a rare event of a long power outage – do you need ALL your appliances to run at the same time? Or perhaps just the most important ones such as a refrigerator, an 8000 BTU AC, TV and a set of lights? Quite a lot of people on Amazon reported using even small inverter generators during the hurricane Irma and were happy with the results.

There are plenty of portable generators with really high wattage capable of powering a large number of appliances. A good example is Duromax XP10000EH –  with its 10,000 rated watts, it can easily power most of the major home appliances.

A reliable 10000 watt generator would be ideal for most users.

However, if you are sure you need even more power, then there are portable generators with 12,000 or even 15,000 running watts. As you can see in the graphic below, these can supply enough energy for pretty much everything you need in your home. (1kW = 1000W)

What can different sizes of generators power

Portable generators rated at 7 KW (7000 watts) can run the essential appliances. Larger 17 KW generators can pretty much power the whole house. Source: Popular Mechanics

3. You can easily move a portable generator

That might sound obvious, but the freedom of movement that portable generators offer is truly a wonderful thing. While standby generators have to be permanently installed on concrete pads, you can easily move a portable generator from one place to another.

You can safely store a portable generator in the basement for most of the year just to pull it outside and get it back to work whenever the emergency happens.

One downside is that they do not add any value to your home. However, this is a somewhat minor disadvantage, offset by lower set up and maintenance costs of portable generators.

Ok, so which exact portable generators are suitable for a home?

Westinghouse WGen12000 is one of the best portable generators capable of powering most of the home devices.  Duromax XP12000EH is another popular choice. Both are rated at 12,000 running watts.

If you are looking for a bit smaller model available at a lower price, then A-iPower SUA12000E comes recommended.

If you need even more power, then there is Generac 7534 with its 15,000 running watts. However, several people have reported problems with maintenance and poor customer service provided by Generac.

Make sure also to check our calculator to find out how big of a generator do you need for your house.

Why Should You Get the Best Whole House Generator?

If you absolutely can’t do without power to the entire house or don’t want to face the limitations of a small, gas-powered generator, purchasing a whole house generator is something that you should give serious thought. Unlike the silent portable units, a standby whole house generator is installed permanently on a concrete pad and connected directly to your home’s electric box to provide uninterrupted power that can kick in automatically. It is directly related to a ready fuel source, such as natural gas, that can supply all of your electricity needs for days.

A unit generating 20 kilowatts can easily power the average home, and you may not need to forego the microwave popcorn or even turn down the AC. It depends on the size of the home and power needs; a 5000-watt portable unit might be better for an RV or small cottage. Whole house generators allow even larger homes with high power use to keep things running smoothly no matter what happens to the public power grid. Most likely, you’ll conserve power to conserve fuel, but if you’re one of those whose loved ones or livelihood depend on electricity being available, good quality whole house generator for your budget is vital.

Why purchase a standby generator

Boredom is also an issue. If you face the possibility of days without electricity, that means days without television, computers, electric lights, and all the other conveniences. More than boredom, it could mean misery. It means no AC or fans in the stifling heat of summer, and little warmth in the bone-chilling winter. No more home-cooked meals. Children and even adults will tend to go stir-crazy. Also, if you have a camp stove or back yard grill for meals, no power means all that food in the freezer or refrigerator will go bad, and you’ll find yourself making daily trips for fresh supplies and bags of ice. Aside from comfort, there is also safety to worry about, without bright lights and backup power to security systems.

If any of that sounds terrible, you should look into getting as much standby power as budget permits.

How do the home standby generators work?


What Do You Need To Know Before Buying a Whole House Generator?

The highest quality generators can be pricey. The more power you need, the more you’re going to pay upfront. Then there are fuel costs. The more energy you use, and the longer runtime the generator needs to provide it, the more fuel you need. The type of fuel a particular unit uses, and how difficult it is to get it where you live, should be considered when shopping for a whole-house unit. Check the fuel levels thoroughly unless you want to be scrambling for fuel every time the weatherman predicts a storm. Some units might also require a certain amount of fuel pressure, so be sure your hardware or local utility can deliver.

There’s also a noise factor. Even a portable generator can run at a constant 80 decibels – about the sound of a loud lawnmower, and running continuously. A whole house unit is generally more efficient and more insulated. But the noise level is something to consider, so be sure to take a look at the manufacturer ratings and consumer reviews for each prospective unit to give you some idea, balanced against any options for enclosures, insulation, or sound-proofing. Many models are rated at 62 decibels, which is similar to most of the portable inverter generators reviewed, but that is often the noise level measured at 25 feet away. The closer the generator is to your living area, the lower the level of noise you want to get. The only 100% noiseless sources of power are the solar systems, but then – they are not powerful enough to act as emergency whole house energy supplies.

There may be more periodic costs. A licensed electrician will be needed to do the electrical work, and probably a plumber or local utility technician to hook the unit up to its fuel source. A contractor may have to come in to pour the concrete slab. Whole house generators tend to be bulky, so unloading, moving, and space requirements are something you should take into account. Unless you or friends and relatives can handle all this safely and reliably, you should count the additional labor costs.

As a home generator is a permanent addition to your home, and will generally contribute to its value, you may also run into red tapes such as building permits and property tax. There are also safety inspections and code requirements. Sometimes the retailer or installer will handle these things, but it pays to be sure upfront, so you don’t get slapped with a fine or citation for non-permitted improvements.
Odds are you won’t need the unit to run at full blast 24/7, but noise levels and fuel consumption can also be dependent on run time.

Before purchasing, make sure a trained technician visits your home to assess your power needs, living area cubic footage, home electrical system, appliances, and possible installation issues. Find out the minimum level of wattage you need, and go from there.

There’s also quality and durability. Whole house generators work hard and will need maintenance if they’re going to be ready to power your home in an emergency. The best whole house generators can be set up with periodic self-tests to ensure they’ll be up and running when needed. Standby generators require a short runtime periodically, known as exercise, to test and ensure the system is functioning properly and ready for an emergency.

How Much Should You Spend on a Home Generator?

Be aware that the energy produced by generators is not the same as grid-supplied electricity. Generators produce harmonic distortion, which can affect or even damage sensitive devices like televisions and computers.

To get your rough estimate of what kind of power you’ll need, you’ll have to add up the applicable requirements of the appliances in your home. You can find a guide online on sites like consumerreports.org. Adding up all these numbers will give you an idea of the maximum wattage you might be consuming. Though you should refer to an expert technician for actual needs, at least this will provide you with a rough idea of what kind of wattage you’re going to need.

A permanent generator that provides 10-15 Kilowatts will typically cost between $3,000 – $10,000, and an added $400 – $1,000 for installation fees. A larger generator that can provide 20 – 40 Kilowatts will usually cost between $5,000 and $20,000. These generators will operate even if you’re away, saving you the headache of returning home to a refrigerator full of spoiled food. In terms of relative costs, it’s often wiser to spend that extra $500 or so on higher wattage for your family needs.

To determine the best whole house generator for your needs, make a list of items you would want to power during a blackout. Each device should have a watt rating. If there is only an amps rating, multiply that number by 120 to find the wattage. If an appliance uses a motor, you’ll have to find the startup wattage and use that instead. Add up the total wattage of the items, and then add 10 or 15 percent to be safe. That is the amount of power your choice of the best whole house generator must provide to meet your needs.

Even the best whole house generators involve extra costs such as fuel tank installation and set up fees, consider that generators are generally a little larger than comparable AC units. Regulations usually require that they are located x amount of feet from property lines or dwellings, and concealed by fences or shrubbery, all of which can add up. Some local regulations may also include periodic inspections.


Q: Which backup generator is best for a home?

A: Based on other research and comparative analysis, Westinghouse WGen9500DF is the best home backup generator. Duromax XP12000EH also comes highly recommended.

Q: What size generator is needed to power a house?

A: You need a generator with at least 10,000 watts to run the essential household equipment. A 15,000 watt unit like this Generac generator will allow you to power everything you need in your house.

Q: Will a 10000 watt generator run a house?

A: A 10000 watt generator will provide enough power to run all essential household appliances, including the air conditioner, refrigerator, freezer, and the lights.

Westinghouse WGen9500DF is one recommend generator in this wattage range.

Q: Do you need a permit to install a whole house generator?

A: Generally, yes, you need to obtain a permit from local authorities to install a standby whole house generator. If you order the generator from a reputable company like Generac, they should be able to help you secure the permit.

9.6 Total Score
Westinghouse WGen9500DF - our choice