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10 Best Ozone Generators

Last updated November 3, 2021

This post may contain affiliate links.

Author
Author avatar Danny Ashton

Danny as been writing about air purifiers for 10+ years. He is a major fan of home technology, which makes him the perfect person to test and evaluate products for HouseFresh

Ozone generators effectively remove airborne allergens and contaminants, as well as eliminate unpleasant odors. They’re particularly useful for getting rid of mold and mildew, both of which are bad for your health and can cause respiratory problems. Plus, if you smoke or live with people who do, an ozone generator will quickly eradicate tobacco smoke. 

However, it’s important to be aware that there are risks associated with these machines and they should be used with caution.

Even though ozone is found naturally in the atmosphere, it is a highly reactive and potent chemical. This means it’s great for removing pollutants and contaminants but is unfortunately harmful to humans and all other living things, such as pets and plants. When inhaled, ozone can create a serious reaction in your lungs, causing coughing and shortness of breath. It’s therefore paramount that you make sure all living things have been removed from the space before using an ozone generator.

When picking out our top choices we looked at the total ozone output, as well as special features like:

  • Easily removable air filter for cleaning
  • Low power consumption
  • Capacity to run almost silently

When you’re searching for the right generator, it’s helpful to keep in mind your budget as well as room size. The Mammoth 7,000mg Ozone Generator is our best modest buy under $100 and covers up to 1,500 square feet. But if you’re looking for a more high-end model, the New Comfort 6 Stage UV Ozone Generator is great value and encompasses up to 3,000 square feet.

To ensure we found the best ozone generators for your needs, we used consumer reports analysis to remove any fake reviews. This meant that all our recommendations came from genuine people like you who have used and love these models.

Ozone Generator
Budget Generator Under $100
Mammoth 7,000mg Ozone Generator, Ozone Air Purifier for Odors in Home, Car, and Large Rooms | Professional and Personal Air Sanitization Applications
Enerzen O-922D - Digital Ozone Generator - O3 Air Purifier Ionizer Deodorizer Sterilizer with Adjustable Settings for Any Room Size
New Comfort 6 Stage UV Ozone Generator Air Purifier Cleaner HEPA Covers 3000 Feet Acyrlic
Pros
The air filter is easy to remove, clean, and reinstall
The fan grill cover is easy to remove to clean the needlepoint ionizer
You can wash and reuse the HEPA filter to extend its life
Cons
We’d like to see a feature that allows the ozone output to be adjusted
There is no timer to control turning the unit on or off
The unit does not have a built-in timer
Room Size Suitability
2500 sq ft
3500 sq ft
3000 sq ft
Total Ozone Output
7,000 mg
360 mg
8,000 mg
Features
Ballast-style ozone plate
Air ionization in addition to ozone generation
You can run the air purification and filtration separately from the ozone generation
Price
$59.50
$124.95
$299.99
Budget Generator Under $100
Mammoth 7,000mg Ozone Generator, Ozone Air Purifier for Odors in Home, Car, and Large Rooms | Professional and Personal Air Sanitization Applications
Pros
The air filter is easy to remove, clean, and reinstall
Cons
We’d like to see a feature that allows the ozone output to be adjusted
Room Size Suitability
2500 sq ft
Total Ozone Output
7,000 mg
Features
Ballast-style ozone plate
More information
Price
$59.50
Mid-range Generator
Enerzen O-922D - Digital Ozone Generator - O3 Air Purifier Ionizer Deodorizer Sterilizer with Adjustable Settings for Any Room Size
Pros
The fan grill cover is easy to remove to clean the needlepoint ionizer
Cons
There is no timer to control turning the unit on or off
Room Size Suitability
3500 sq ft
Total Ozone Output
360 mg
Features
Air ionization in addition to ozone generation
More information
Price
$124.95
High-End Generator
New Comfort 6 Stage UV Ozone Generator Air Purifier Cleaner HEPA Covers 3000 Feet Acyrlic
Pros
You can wash and reuse the HEPA filter to extend its life
Cons
The unit does not have a built-in timer
Room Size Suitability
3000 sq ft
Total Ozone Output
8,000 mg
Features
You can run the air purification and filtration separately from the ozone generation
More information
Price
$299.99

Last update on 2021-11-12 / Affiliate links / Images from Amazon Product Advertising API

1. New Comfort 6 Stage UV Ozone Generator

When you’re looking for a complete air purification system, then the New Comfort 6-Stage Ozone Generator is the unit for you. Beyond the benefits of appropriate ozone generation, this unit has six different technologies at work.

The unit also employs a HEPA filter to remove airborne particulates as small as 0.03 microns. Next, UV-C and titanium dioxide are used to neutralize viruses, bacteria, and mold. Activated charcoal then removes many odors and impurities through chemical absorption. Negative ions are also released to cause impurities to clump together and fall out of the air.

The unit’s controls are simple, with one dial for ozone generation and then another for ionization and UV purification with the fan. This allows you to use the enhanced purification function even when you’re not producing ozone.

The design is slick and modern, with clear walls allowing you to see inside the unit. The components inside are black, so they won’t detract from modern decor. The fan offers five different speeds, so you can not only control how much air it circulates but also the level of noise it emits.

And it won’t take up a lot of room, either. This unit measures a mere 10 x 8 x 11 inches, and only weighs 10lbs. This makes it perfect to put on a shelf where it’s out of the way. Despite its compact size, it circulates enough air to service larger rooms.

  • Room Size Suitability: 3,000 sq. ft
  • Total Ozone Output: 8,000 mg
  • Special Features: You can run the air purification and filtration separately from the ozone generation

What we love

  • The unit uses very little energy, drawing only 120 Watts per hour
  • You can simultaneously run the Ozone and air purification functions
  • You can wash and reuse the HEPA filter to extend its life
  • The ozone plates and UV bulb are easy to replace

We don't like this as much

  • The unit does not have a built-in timer to automatically turn it off
  • The power cord may be too short to put on a high shelf

2. Enerzen O-922D Digital Ozone Generator

When you need powerful ozone sanitization in a compact box, then consider this Enerzen unit. The unit measures only 7 x 8.5 x 6.5 inches and weighs only 7.8 lbs, making it easy to set up in just about any space. 

It has variable ozone output, with as little as 150 mg/h and up to 30,000 mg/h. With five fan speeds, it offers a 30-second delay so that you can exit the room before the ozone starts flowing, making it extremely safe to operate.

You also have a timer function that can be used to set the unit to automatically shut down after the cycle finishes. This timer starts at a default of 15 minutes and is adjustable for up to 12 hours. In addition, the unit has an interval timer for 12 and 24 hours to set the unit to automatically run on a schedule.

The controls for the O-922D are simple. The ozone button sets the ozone output from 20% to 100%. The fan button selects the fan speed. Interval allows you to set the repeat function. The timer sets how long the unit will run during its cycle. The power button starts the cycle, giving you 30 seconds to exit the room. The display corresponds to the buttons so that you can easily see the settings. The timer on the display shows how much time is left on the current cycle.

  • Room Size Suitability: 6,000 sq. ft
  • Total Ozone Output: 30,000 mg
  • Special Features: The unit has a pulsating effect that automatically adjusts the fan speed and ozone output that aids in destroying embedded odors

What we love

  • There’s an indicator to remind you when to clean and replace the ozone plate
  • The unit's settings adjust easily so that you can effectively treat your size room
  • There is a hold function to allows you to use it continuously
  • Arrives with the ceramic ozone plate preinstalled

We don't like this as much

  • We wish the unit has a companion app for your phone which you could use to track its progress
  • It is not designed to circulate and filter air, but purely to output ozone

3. Ivation Ozone Generator Air Purifier, Ionizer & Deodorizer

Ivation is one of the most trusted brands in consumer indoor air quality products. This ozone generator and air purifier upholds that reputation.

While the ozone generation for this machine is perfect for a house, it doesn’t stop there. This machine also has an ionizer, releasing negatively charged ions to cause airborne contaminants to stick together and fall from the air. The ozone is enough to help reduce the common odors you might find around your home.

It does all of this while remaining very compact. The unit is only 12.5 x 11 x 15 inches and weighs only 12lbs. The unit has a beautiful cherry wood housing to accentuate most decors. The back is stainless steel and has an opening for the ceramic and metal ozone plate as well as the power port.

There are independent knob controls for ozone generation and fan control with ionization. This allows you to run the ionization even when you don’t need additional ozone. It also means you generate exactly the right amount of ozone for your space. The unit produces a maximum of 360 mg per hour of ozone. You can easily clean the included ceramic ozone plate, allowing you to extend its service life.

  • Room Size Suitability: 3,500 sq. ft
  • Total Ozone Output: 360 mg
  • Special Features: Offers air ionization in addition to ozone generation

What we love

  • The fan grill cover is easy to remove to clean the needlepoint ionizer
  • The unit produces a gentle white noise while the fan runs
  • Perfect control for the amount of ozone production to match your space
  • The wood finish makes it feel warmer in your room than most appliances

We don't like this as much

  • There are no filters to protect the ionization unit
  • There is no timer to control turning the unit on or off

4. Airthereal MA10K-PRODIGI Digital Ozone Generator

Airthereal has brought to market a stylish ozone generator for medium size rooms. Rated to condition a room of up to 2,000 square feet, it’ll put out up to 10,000 mg of ozone per hour, handling even the most stubborn household odors.

The unit measures 7 x 9 x 7 inches and weighs only 6.6 lbs, making it safe to set a shelf and is also very quiet, emitting only 45dB. The case is made of blue 304 stainless steel, proving to be both stylish and extremely strong.

You can easily control the unit with the simple 5-button control that allows you to set the fan speed and ozone generation level. The backlit display shows all the settings so that you can easily see how the unit is set and how long is left on the cycle.

There’s also an interval and timer to allow you to set the length of each cycle, up to 120 minutes per cycle. The interval setting allows you to choose either 12 or 24 hours between cycles. When you do set the unit to start, there’s a 5-second delay to allow you to exit and seal the room.

The fan has five different settings, circulating from 40 to 100 CFM. The ozone generator will produce a minimum of 2,000 mg per hour, giving you plenty of options for your room size.

The unit won’t have a large effect on your energy consumption, with a total 110 Watt rating. You’ll also have plenty of options for where to place the unit with the included 5-foot power cable.

  • Room Size Suitability: 2,000 sq. ft
  • Total Ozone Output: 10,000 mg
  • Special Features: Integrated hexagonal honeycomb current ceramic plate for more efficient and higher concentration ozone production

What we love

  • The ceramic plate and pre-filter come pre-installed with the unit
  • It has a longer power cord than most to make setting it up on a higher surface easier
  • If you need a longer power cord, it uses a standard computer-type power cable
  • It has an integrated handle on top to help make moving it easier

We don't like this as much

  • It’s can be a bit tricky to get the ceramic plate and pre-filter out to clean
  • We wish the start-delay was increased to allow more time to exit the room

5. Airthereal MA10K-PRO Ozone Generator

Airthereal’s MA10K-PRO model is a more streamlined version of the MA10K-PRODIGI model. This one measures 7.1 x 9.3 x 6.8 inches and weighs only 6.6 lbs. The unit is nearly silent while it runs, emitting a mere 45dB. The compact size makes it easy to place.

The unit has an integrated swiveling handle on the top to easily move the unit. It has a bold yellow metal housing with a black face and back, and rubber feet on the bottom to prevent scratching your furniture. There is also a power light on the front to alert you when the unit is in operation.

The MA10K-PRO has a very straightforward control panel, with the only control both turning the unit on and setting the timer. You can set the cycle length up to 120 minutes, or to run continuously. 

The unit has an upgraded honeycomb ozone plate. This allows the unit to produce 10,000 mg of ozone per hour, while only consuming 110 Watts of power. The efficient design allows the entire unit to sanitize an entire room in mere minutes. A small bedroom of less than 200 square feet will be sanitized in about 10 minutes. A larger living room of 700 square feet may take about 45 minutes.

The back of the unit has a prefilter to keep out large particle contaminants, like hair and dust. The power cable is a standard computer-style cable, allowing you to easily replace it if needed.

  • Room Size Suitability: 2,000 sq. ft
  • Total Ozone Output: 10,000 mg
  • Special Features: Simple single dial control to turn the unit on

What we love

  • The unit is small and easy to store when you don’t need it
  • The hexagonal honeycomb current ozone plate has a 5-year service life
  • It comes with a 5-foot power cable to reach nearby power outlets
  • You only need a short run-time to effectively treat most common room sizes

We don't like this as much

  • We wish you were able to manually control the amount of ozone produced
  • You do need to disassemble the unit to clean or replace the ozone plate

6. OdorStop OS900/6G Professional Ozone Generator

Smells in small spaces stand no chance against the OdorStop OS900/6G. OdorStop specializes in ozone generators from compact travel to industrial warehouse sizes. Although the OS900/6G is a compact unit, it still packs a punch. The case is blue aluminum and there’s also a swiveling handle which is used to help move the unit, along with rubber feet to prevent scratching surfaces where you set it.

Despite its compact size, it puts out a maximum of 400 mg of ozone per hour and circulates 80 CFM while running. The unit has a straightforward control panel, with only a timer knob. Turn the knob on to set the run cycle for up to 120 minutes, and it starts running. Turn the knob counterclockwise, and the unit is put on continuous operation. There is a small indicator light on the front to let you know it is operating.

You can easily use this model to sanitize and deodorize small to medium spaces. Run it for 10 to 15 minutes in a small space like a closet. Put it in a larger space, like a living room, and run it for 90 to 120 minutes to effectively circulate the ozone.

The ozone plate will need periodic cleaning to continue operating effectively. Remove the four screws from the upper half of the aluminum casing and slide it off to expose the plate. You can easily remove it, clean it, and reinstall it.

  • Room Size Suitability: 900 sq. ft
  • Total Ozone Output: 400 mg
  • Special Features: Easily replace the air filter without having to disassemble the unit

What we love

  • It comes with the ozone plates already installed so that it’s ready to use out of the box
  • It has a large output vent to move the 80 CFM generated by the fan
  • The back of the unit has a replaceable filter
  • You can easily replace the computer-style power cable if you need a longer reach for the power supply

We don't like this as much

  • The fan and ozone output are either on or off, with no adjustment
  • You have to remove the top cover to clean or replace the ozone plate

7. Enerzen O-UVC3 Industrial Ozone Generator

Offering exceptional purification, take a look at the Enerzen O-UVC3. This unit maintains a compact size, measuring only 8.75 x 10 x 7.75 inches, but incorporates more than just ozone generation. It weighs just 11.38 lbs, allowing you to easily set it on a high shelf to assist with ozone distribution.

The unit has three separate ozone plates, producing up to 40,000 mg per hour. In addition to ozone production, it also has a HEPA filter on the back, removing fine airborne particulate matter. It also has a UV-C bulb in the unit, to further protect you and your home from viruses, bacteria, and other microscopic particles. There is an indicator lamp in the upper-left corner to alert you when it is running.

The unit has two separate control knobs, the first for ozone production and the second for the fan and UV bulb. The ozone control knob sets a timer to run up to 24 hours, or you can run it continuously. The fan and UV bulb knob simply sets the fan speed with circulation up to 100 CFM. The knob will adjust it by percentage, so at 20%, it’ll circulate roughly 20 CFM.

If desired, you can reduce the amount of ozone produced by removing one or two of the plates. You can also run the fan and ozone independently, so you can run filtration without ozone generation. This is helpful so that you can continue to run filtration and UV-C purification while the room is occupied.

  • Room Size Suitability: 9,000 sq. ft
  • Total Ozone Output: 40,000 mg
  • Special Features: It has three ozone plates for maximum ozone generation

What we love

  • Easily store the power cable on the back of the unit while it's not in use
  • The unit has an industrial-grade aluminum alloy case
  • The HEPA filter removes tiny particulates, down to 0.3 microns
  • It runs quietly, emitting a mere 45dB while the fan runs on high

We don't like this as much

  • The power cable is on the shorter side, meaning an extension lead may be required
  • We wish the unit had rubber feet to help protect surfaces it is placed on

8. Alpine Air 10000OGM Commercial Ozone Generator

Alpine Air offers a compact and budget-friendly ozone generator with the 10000OGM model. It measures only 12.6 x 12.4 x 10.5 inches and weighs 10.5 lbs. Because ozone is heavier than air, this small size allows you to place it on a high shelf without additional reinforcement, providing much better circulation. Its black finish is nondescript, so it won’t draw a lot of attention if you leave it in place.

The unit has two simple controls, a timer dial, and the output selector. Start by choosing whether you want 5,000 or 10,000 mg of ozone produced per hour. Then turn the knob to set the runtime before exiting the room. If you’re using it in a larger room or have stubborn smells, the unit offers a hold function for continuous runtime.

This unit has special ozone ballasts instead of the normal ceramic plates. When you choose the 5,000 mg output, it activates only one, while running at 10,000 mg output uses both. Each ballast is rated for up to 20,000 hours of service life. The ozone ballasts easily mount in the bottom of the unit with hand screws, so there’s no disassembly required to clean or replace them.

The unit has a permanently fastened handle on the top so that you can easily lift it into position. It also has rubber feet on the bottom so that it won’t scratch wherever you set the unit. The 10000OGM also offers a pre-filter on the intake to protect the fan and ballasts from airborne contaminants.

  • Room Size Suitability: 1,000 to 3,000 sq. ft
  • Total Ozone Output: 10,000 mg
  • Special Features: The ozone output selector allows you to choose between 5,000 and 10,000 mg output

What we love

  • The ozone ballasts are easily removed without the use of additional tools
  • The unit uses a minimal 100 Watts, so you’ll hardly notice an impact on your energy bill
  • The power cable is standard computer-style, so you can easily get a longer one if needed
  • It includes a runtime chart in the owner’s manual to help gauge how long to run the unit

We don't like this as much

  • The handle doesn’t fold down, so you have to leave room above the unit for it
  • It uses non-standard ozone ballasts, so it can be tricky to find replacements

9. Concise Home Air Ozone Generator & Air Purifier

Concise Home brings you a compact yet powerful ozone generator for purifying the air around your living space. The unit measures 6.7 x 7.5 x 7.9 inches and weighs a mere 5.51 lbs., meaning it won’t cause your shelf to come crashing down.

The unit is entirely black with a silver swiveling handle mounted to the top. It also has non-skid rubber feet to keep it in place without scratching your furniture.

It offers simple controls for operating the unit with a single knob. This turns the unit on and allows you to set the timer to control the cycle length, up to 120 minutes. If you are servicing a larger area, it has a hold function so that you can manually control how long it runs. There is an indicator light on the front to alert you that the unit is running.

The output vent is large with elongated holes to make circulating the ozone more efficient. It has a high-density cotton fiber filter at the intake on the back to remove larger particles before they can settle on the fan or ozone plate. The filter easily mounts to the air intake on the back with a plastic frame that fits over the fan housing.

  • Room Size Suitability: 2,000 sq. ft
  • Total Ozone Output: 5,000 mg
  • Special Features: Larger, elongated output holes for efficient ozone circulation.

 

What we love

  • The included power cable is long enough to provide some flexibility in unit placement
  • The handle folds down, requiring less vertical space if you set it up on a shelf
  • It has a very low power consumption, rated at 75 Watts
  • The ozone plates are rated to last about 4,000 service hours

We don't like this as much

  • We’d like to see an easy way to remove the ozone plate for cleaning or replacement
  • There’s no delayed start for the system to allow you to exit before it starts running

10. Mammoth 7000OG Ozone Generator

Mammoth offers a budget-friendly but high-capacity ozone generator with the 7000OG model. The unit’s compact design measures 10 x 7.75 x 8.5 inches and weighs just 9.33 lbs. It puts out an incredible 7,000 mg of ozone every hour to sanitize everything from small spaces to larger rooms up to about 2,500 square feet.

The unit has a black aluminum case with a black plastic handle attached to the top. There are non-skid rubber feet on the bottom to protect the surfaces under the unit and keep it from sliding around.

The 7000OG has a single control knob that operates the timer. Setting the timer turns the unit on, and automatically shuts it down after 10 to 120 minutes. For larger spaces, you can set the timer on Hold for continuous operation. The large fan on the back draws in air to circulate the ozone out into your room. There is also a mesh pre-filter to keep large particle contaminants out of the unit, protecting the fan motor and ozone plate.

The ozone plate is ballast style and is mounted inside the unit. It is rated to last about 6,000 service hours or about 2 years of use. With the ozone output, it’ll sanitize a 300 square foot room in about 5 minutes, and a 1,000 square foot room in about 15 minutes.

  • Room Size Suitability: 2,500 sq. ft
  • Total Ozone Output: 7,000 mg
  • Special Features: The unit has a ballast-style ozone plate, which offers longer life and lower energy consumption

What we love

  • The air filter is easy to remove, clean, and reinstall
  • The power supply is easy to replace with a standard computer-style connection
  • There’s a serviceable fuse to protect the unit from power surges
  • The larger fan helps circulate more air to better disperse the ozone throughout your room

We don't like this as much

  • We’d like to see a feature that allows the ozone output to be adjusted
  • The unit is heavier than many other similar output models

Frequently Asked Questions

What is ozone?

Everyone knows about oxygen, and how important it is for every living thing. Oxygen is made up of two oxygen atoms. Add a third oxygen atom to that molecule, and you’ve now created ozone, also known as trioxygen. Ozone’s third oxygen atom shares an unstable connection to the other two atoms. Because of this unstable connection, it easily detaches from the molecule and attaches itself to pollutant molecules. By adding the extra oxygen atom to pollutants, the molecular composition changes, thereby destroying the pollutant molecule. This is why it renders bacteria and viruses inert and destroys odor-causing molecules.

How long should you run an ozone generator in a room?

The length of time you need to run an ozone generator depends on several factors, including the ozone output, size of the room, and the goal of running the generator. Typically, the smaller the room and the higher the output, the shorter time you have to run the generator. This is because the concentration, measured in parts per million, or PPM, of ozone will be higher.

If your goal is to simply get rid of odors, you may only need to run the ozone generator for a few minutes. However, if your goal is to sanitize the room, then you’ll likely need to run the generator for several hours, depending on the size of the room. This keeps the concentration of ozone high enough to destroy the harmful molecules.

Can you be in a house with an ozone machine?

The EPA has strongly warned against using ozone generators with anything living present, especially while producing high concentrations. The third, unstable oxygen atom causes problems for anything dependent on breathable oxygen, or O2.

For humans, it can cause damage to the lungs, including causing chest pain, coughing, shortness of breath, and throat irritation. It may also exacerbate respiratory conditions like asthma.

The recommendation is to remove everything living from the space before using an ozone generator, including people, pets, and all plants. You need to then allow the space a chance to settle before reentering. Depending on the ozone concentration, your space may be habitable anywhere from 30 minutes to several hours after the generator stops.

Which Ozone Generator is best for you? 

The first key to consider when looking for the right ozone generator is the size of space you’re wanting to treat. Generally, the larger the room, the larger the output you’ll need. Also, consider your goals for running the unit. If you’re wanting to sanitize the space, you’ll need a unit that runs longer than if you’re only neutralizing odors.

Finally, consider the special features that will make the unit work better for your environment. Do you need something that will work on improving the air, even when it’s not producing ozone? Consider getting a unit that has UV purification with independent ozone controls. If you have a sensitive respiratory system, make sure your unit has a delay start feature so that you can leave the space before the unit starts producing ozone.