The Best Carbon Monoxide Detector
1. First Alert SCO5CN Smoke and Carbon Monoxide Detector
Key Features
2-in-1 smoke and carbon monoxide protection
Indicator lights
85-decibel siren with different noises for each warning
AA battery operated
7 year limited warranty
Test and silence button
Our best choice product goes by the name of the First Alert SCO5CN Smoke and Carbon Monoxide Detector. We particularly love the design of this detector as it is very sleek and simple yet has a lot to offer. It has clever dual sensors that can detect both smoke and carbon monoxide, making it a cost-efficient option for a home or building that needs both types of detector installed. These sensors will only react to real alerts and never get confused with minimal amounts of steam coming from showers or cookers.
With regards to the alert system, this First Alert detector has a loud 85-decibel siren which will make a different noise depending on whether there is smoke or carbon monoxide present. And, to add even further to efficiency, this detector requires just two AA batteries to install. Simple!
Pros
This is battery operated meaning you’ll never have to cover extra costs for installation
Alert system has different ‘beeps’ depending on the warning
The indicator lights provide extra security, instructing you on what to do
Cons
Traditional design which some people may not like in modern homes
Battery tray may lose strength over time
2. Google Nest Carbon Monoxide Alarm
Key Features
2-in-1 smoke and carbon monoxide detector
Connects to your phone
Split-Spectrum Sensor
App silence option for controllable situations
Next up, we have the Google Nest Carbon Monoxide Alarm alarm. This smart home alarm is a popular favorite amongst modern and tech enthusiasts; the team at Nest has had no problem creating another excellent product to suit their needs.
Branded as ‘the smoke alarm other alarms look up to’, the Nest Protect truly is in a league of its own. It contains a Split-Spectrum smoke sensor that lasts up to 10 years, saving you the trouble of having to replace it for a long time to come. It even tests itself automatically, eliminating any fears you might have about your detector silently breaking. And don’t worry – the Nest Protect will alert your phone if there is a problem that needs seeing to.
Pros
The clever sensor will test itself, reducing routine check costs
Always stay in-the-know with handy phone alerts
10 year lifespan keeps you safe and worry-free for a long time
Cons
30 day return window is quite small
Some reviews claim that the sensor is too sensitive
3. Kidde KN-COB-LP2 9CO5-LP2 Carbon Monoxide Detector
If you’re looking for a carbon monoxide alarm that does an amazing job without breaking the bank, then you’re going to love this Kidde KN-COB-LP2 9CO5-LP2 Carbon Monoxide Detector alarm. Its compact, battery-operated, design will blend well into your home while monitoring carbon monoxide levels on a continuous basis. If there is ever a problem, the piezoelectric horn will alert you at 85-decibel, informing your whole household that a problem needs to be dealt with. And, if the alarm wasn’t enough, a simple indicating light system will instruct you on whether there is an issue. A constant green flash means that everything is fine and a red pulse indicates that carbon monoxide has been detected.
Pros
Loud alarm ensures all household members will be able to hear it
Sliding battery door gives you immediate access
Test/reset button makes testing the device quick and easy
Cons
Does not detect smoke
4. Kidde 21026043 carbon Monoxide Detector
Key Features
2-in-1 smoke and carbon monoxide alarm
Voice alerts
Hush feature to silence nuisance alarms
Front-loading battery door
Prefer your gadgets to have a human touch? No problem. The Kidde 21026043 carbon Monoxide Detector embraces exactly that. This intelligent alarm is unlike many others; it has a voice activation system that will either alarm ‘Fire!’ or ‘Warning – Carbon Monoxide!’ depending on the problem at hand. This is really useful for those who wish to have extra security and stability when faced with a testing situation.
Of course, this 2-in-1 alarm has so much more than voice alerts. It also features an easy access front-loading battery door for quick changeovers and a hush mode to silence nuisance alarms. You’ll never experience the frustrations which come from older poorly-designed alarms again.
Pros
The voice alerts help to clarify what problem is at hand
Front-loading battery door prevents the need to re-install alarm
Audio alarm sits at an incredible 85-decibel
Cons
Batteries may need frequent seeing-to
This uses an Ionization sensor which might not be as effective as detecting smoke
5. First Alert BRK SC9120B Smoke and Carbon Monoxide Detector
Key Features
2-in-1 smoke and carbon monoxide alarm
Connects with up to 18 compatible alarms
Easy to install
Battery backup system
We’ve got another amazing smoke and carbon detector from to share with you. The First Alert BRK SC9120B Smoke and Carbon Monoxide Detector alarm is packed with many features that will guarantee your safety no matter what. We particularly love that this alarm is compatible with up to 18 devices, making it the ideal product to have in a large building that requires multiple alarms to alert residents that there is danger. Just one trigger of the SC9120B alarm will be enough to sync up with the compatible alarms and create a louder alert.
This alarm automatically performs its own tests, making it an ideal detector for those who don’t want to waste money paying professionals to do this. And, thanks to the battery backup, the detector will always be functioning even if there is a power failure. This simple to use alarm is truly a dream come true for those in charge of large buildings that need the utmost security!
Pros
The battery backup system ensures that the monitor is always detecting, even during a power outage
Easy installation means multiple can be installed in a big building quickly
Tamper-resistant locking brackets make this alarm ideal for public places
Cons
Only BRK and First Alert detectors are compatible
If over-sensitive and synced to several devices, you will have a lot of alarms to deal with!
6. Kidde Nighthawk KN-COPP-3 Carbon Monoxide Alarm
The Kidde Nighthawk KN-COPP-3 Carbon Monoxide Alarm is a modern carbon monoxide alarm that boasts many features including a digital display, test button functions and battery backup. The digital display is really handy to have if you want to stay in the loop at all times; it informs you on the CO levels in your home, and of course, alerts you when levels are too dangerous. The beeps that you hear will vary depending on the danger level.
Thanks to the simple test/reset button, it has never been easier to keep up with the maintenance of your carbon monoxide detector. Just press the button when in need of a test and your job will be done.
Pros
The battery backup helps to keep you safe, even during a power outage
Clear alert system helps you to safely replace the detector every 10 years
Testing button makes routine checks quick and easy
Cons
Not suitable for travel due to being quite heavy
Some reviewers have found that their homes are not suitable for the recommended placements
7. Kidde KN-COEG-3 Carbon Monoxide and Explosive Gas Detector
Key Features
2-in-1 carbon monoxide and explosive gas detector
85-decibel pulsing alarm
3 mounting options
Digital display that records CO levels
The Kidde KN-COEG-3 Carbon Monoxide and Explosive Gas Detector features Nighthawk sensor technology to keep your whole household safe from the dangers of carbon monoxide and explosive gas. This is one of the most intuitive monoxide detectors around; it has a digital display that can show you the peak CO level recorded since reset and also the current level of carbon dioxide if there is any around. The sensor will also detect any traces of methane or propane, eliminating the risk of any nasty gas explosions.
This detector is designed for home use. It plugs directly into any AC unit, and in the event of a power outage, it has a 9-volt battery backup to ensure continuous monitoring. If you don’t wish to plug it into an AC unit, then you can benefit from the 6-foot extension cord that makes it possible for wall installation instead. The choice is yours.
Pros
3 different mounting options make this device compatible in most homes
Very few alarms can detect explosive gas, making this one unique for all the right reasons
Test/reset button means that you can silence the alarm in an instant
Cons
Must be mounted up high for the natural gas detector to work properly
Backup batteries may not have enough power to last through a long outage
8. First Alert CO400 Carbon Monoxide Detector
Key Features
Loud 85-decibel alarm
5 year warranty
Electrochemical carbon monoxide sensor
Test/silence button
Warranties are important when it comes to products as vital as carbon monoxide detectors. Your peace of mind is sacred and a company that offers strong warranties is usually a company you can trust. This is why we love the First Alert CO400 Carbon Monoxide Detector so much; it comes with a five-year limited warranty and an ‘end of life chirp’ so that you’re never left in the dark.
No matter where this detector is placed, it will guarantee accurate results. It has an advanced electrochemical carbon monoxide sensor and a loud 85-decibel alarm to alert you of any dangers in the home. In terms of installation, this CO detector has an easy access battery door for a quick recharge and even comes with a 9-volt battery to make matters easier.
Pros
All First Alert CO alarms meet UL standards, ensuring safety
5 year limited warranty gives you peace of mind
Detector is accurate no matter where it’s placed
Cons
Some reviewers received products near end of life – always check the manufacture date!
9. X-Sense SC01 Carbon Monoxide Detector
Key Features
2-in-1 smoke detector and CO detector
10-year battery life
Large digital display
Test/silence button
The very best smoke and carbon monoxide detectors should last for up to 10 years before needing to be replaced. But, unfortunately, many detectors don’t hold their end of the bargain and need replacing soon after they are installed. This can become quite the nuisance if you’ve installed several alarms in a large building!
With help from the X-Sense SC01 Carbon Monoxide Detector you no longer have to worry about whether the battery will last for long periods of time. Instead, you’ll have full trust over knowing that this device prides itself on having a strong 10-year battery. This 2-in-1 detector also has a large LCD display which will keep you informed on the CO concentration in the air.
Pros
Easy installation
Easy to read screen shows you carbon monoxide levels
4 different light indicators help to distinguish the problem
Cons
Traditional design may not be ideal for modern homeowners
10. First Alert CO615 Carbon Monoxide Detector Alarm
Another amazing product from First Alert is the First Alert CO615 Carbon Monoxide Detector Alarm. This alarm has a battery backup system for constant monitoring and even has a digital display to tell you carbon monoxide levels. We particularly love that this CO detector isn’t too ‘in your face’ – it is small and compact, making it ideal for homeowners who go to great efforts with their interior design.
In terms of the alarm, this detector has a loud 85-decibel alarm that will alert you when there are dangerous levels of carbon monoxide in the home. And, for guaranteed safety, this carbon monoxide alarm comes with a seven-year limited warranty and an end of life chirp.
Pros
Multi-pack discounts available for those who need more than one detector
85-decibel alarm is loud enough for the whole household to hear
Small and compact design makes this device blend into any home effortlessly
Cons
Does not detect smoke
11. BQQZHZ Combination Smoke and Carbon Monoxide Detector
For those looking for modern-looking carbon monoxide detectors, we can’t recommend the BQQZHZ Combination Smoke and Carbon Monoxide Detector enough. This incredibly attractive alarm can detect both smoke and carbon monoxide while informing you of CO concentration levels on the large digital display. Carbon monoxide poisoning is a silent killer and so it is important to have a clear understanding of the CO levels in your home at all times.
Equipped with 360-degree protection and an easy installation process, there’s not much that the BQQZHZ alarm can’t do. We know you’ll love it.
Pros
4-step installation process is incredibly easy and requires no professional assistance
360-degree protection ensures that you will always get the most accurate reading
Real-time display makes viewing CO levels easy
Cons
Light display has different colours which may cause problems in bright daylight
12. Alert Plus Carbon Monoxide Alarm Detector
Key Features
Human voice prompts
Digital display shows CO concentration and 24-hour clock
Long standby time
Auto-detect sensor failure
Very few carbon monoxide detectors incorporate color into their design, but if you’re a fan of red detailing, then we’ve found the best detector for you. This Carbon Monoxide Alarm Detector from Alert Plus has cleverly incorporated a sleek design with high-functioning features. We’re talking a powerful 85-decibel alarm, 5-year warranty, voice warning battery and much more. If aesthetics combined with safety is what you’re after in the home, then look no further than right here.
Pros
Unique design will complement any home interior
Electrochemical sensor is highly reliable
Comes with a 5-year warranty for extra peace of mind
Cons
The digital display is quite small and might be hard to read
13. Kidde 21007267 Nighthawk Carbon Monoxide Alarm
Looking for the best carbon monoxide detectors that are low-fuss? Would you rather have an alarm that doesn’t stick out like a sore thumb? No problem – we have just the answer. Say hello to the Kidde 21007267 Nighthawk Carbon Monoxide Alarm. This alarm comes with a digital display small enough to show CO levels without being too obnoxious or bright. The display updates every 15 seconds to ensure the readings are always as accurate as possible.
As well as the digital display, this Kidde detector has two different LED light systems that will keep you informed on activity. Red will show when in alarm mode and green will show when operations are normal. Nice and simple!
Pros
Small design means this alarm can be installed in any location without being in the away
Device is battery operated meaning you will never have to pay large maintenance bills
Backlit display helps to read CO levels in the dark
Cons
The screen is very small – some people may find it hard to read
14. Vitowell Combination Smoke and Carbon Monoxide Detector
Key Features
2-in-1 smoke detector and CO detector
LCD display shows CO levels
Test/silence button
5-year warranty
We’re ending this buying guide on a very high note with help from this Combination of Smoke and Carbon Monoxide Detector from Vitowell. This 2-in-1 alarm uses an electrochemical sensor to record nothing but accurate readings, all while detecting both fast and slow-burning fires. The LCD display will help to indicate CO levels in your home and the test/silence button will ensure that the alarm is always kept well-maintained without the need for hiring expensive professionals.
This alarm is incredibly easy to install and comes with a 5-year warranty for added peace of mind. What’s not to love about a detector which simply does the trick without cutting corners?
Pros
The test/silence button cuts out any expensive maintenance fees
Electrochemical sensor is very sensitive and always on-the-go
LCD screen gives you a better understanding of the CO levels in your home
Cons
The LCD screen is very small and may be difficult to read
Features To Consider With Carbon Monoxide Detectors
Read on to discover some of the most important features to look out for when looking for the best carbon monoxide detector.
Quality
It might be tempting to opt for the cheapest detector you see, but when your safety is involved, it's not a wise move. When browsing through carbon monoxide detectors, always check to see the quality of both the products and the brand. If the product boasts a huge array of excellent features and the brand is highly reputable, then the detector is likely to be of high quality.
Size And Design
The size and design of the detector will entirely depend on where you plan to put it. More times than not, people prefer to use compact detectors that are easy to read yet don't ruin the appearance of the room. So, when looking for the best carbon monoxide detector, don't forget to think about where it is going to be placed in the home.
Smoke Detection
Smoke detectors are just as important as CO detectors - but do you really want two different alarm systems installed in your home? The majority of products in this guide feature a 2-in-1 smoke and carbon monoxide detector system, saving you both money and a whole lot of hassle further down the line.
Sensor
The sensor is the most important part of any detector - if it doesn't work, then you won't be alerted when there is danger. And, without an alert, there's no point having the alarm! To ensure that you get the best sensor possible, ensure that you read reviews and look into other products and services that may feature the same sensor. You'll be able to get a grasp on its effectiveness from here.
Display
Some CO detectors have display panels which tell you everything you need to know about the levels of CO in your home. Whether you prefer digital readings or a simple light indicator, you'll be sure to find a product that matches your needs.
Additional Features
We're in a world of modern technology, meaning the majority of carbon monoxide detectors are stacked with additional features. From various alert systems to back-up battery packs, we've ensured that all products in this guide have worthwhile features that will add benefit to your life.
Interconnectivity
Are you in charge of a large building which requires several smoke or carbon detectors? It looks like you would benefit from interconnectivity. Be sure to look out for this when looking for the right detector, as interconnectivity can be a lifesaving feature. It involves syncing all of the alarms up so that they alert each other (and you) when there is a threat.
Installation
Paying for professionals to install your detector can be costly; especially when they need constant testing and resetting. With this in mind, many top-quality carbon monoxide detectors feature easy-installation so that you can do it yourself. Whether it be easy-to-access battery packs or three-step instructions, always research into how to install products before buying them.
Maintenance
Similarly to installation, you want a carbon monoxide detector that doesn't require much maintenance. To prevent any maintenance troubles, look out for self-testing features or test/reset buttons. If the device has one of these, then it will take care of itself until it needs to be replaced 10 years down the line.
Warranty
From 3 to 5 to 10 years, many high-quality carbon monoxide detectors will come with a warranty to win over your trust. It is always important to purchase a product with a good warranty as this will act as your insurance in the unfortunate event of a fault happening.
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Types Of Carbon Monoxide Detector Sensors
There are four main types of carbon monoxide detector sensors, all of which come with their own features and benefits. These are:
- Metal Oxide Semiconductor: Uses wired circuits to work. Typically lasts for 10 years.
- Electrochemical Sensor: Considered to be the sensor of the highest quality. They have a long lifespan and work by generating currents that give you an accurate reading of how much carbon monoxide is in the home.
- Biomimetic Sensor: Uses colour-changing liquids to work. Typically lasts for 3 years.
- Optochemical Sensor: A more economical sensor that can also detect poisonous gas. It uses a colour changing pad to alert when CO has been found. It is important to know that optochemical sensors cannot detect levels of CO.
Carbon Monoxide Detector FAQ
Q: What is a Carbon Monoxide Detector?
A carbon monoxide detector - also known as a CO detector - is a sensor and alarm system which detects whether there is carbon monoxide gas in the air. Carbon monoxide has no taste, odor or visibility which is why detectors are essential for your safety.
Q: Where should a carbon monoxide detector be placed?
CO detectors should be placed in any room that has a fuel-burning appliance or in a hallway.
Q: What is the correct mounting height for a carbon monoxide detector?
As a general rule of thumb, aim to keep the detector five feet above the ground. This will help to ensure that it gives the most accurate reading possible.
Q: What can trigger a carbon monoxide detector?
CO detectors can be triggered by all fuel-burning appliances (ovens, boilers, etc). Carbon monoxide levels tend to rise when there isn't a proper ventilation system in place.
Q: What are the symptoms of carbon monoxide poisoning?
The most common signs and symptoms of carbon monoxide poisoning can include headache, dizziness, nausea, shortness of breath and general weakness. Severe symptoms include blurred vision and loss of consciousness.
Q: How many carbon monoxide detectors should I install?
The number of detectors that you install will depend on the size of your building. There should be at least one detector on each floor of your home and another in the basement if applicable. If you are concerned about the quality of the air in your home, it's highly recommended to get an air quality monitor that can tell you the exact level of pollutants in the room.
Q: How to maintain a carbon monoxide detector?
To ensure your carbon monoxide detector maintains a long lifespan, run frequent tests and change the batteries whenever they are running low. As well as this, ensure that it is cleaned often to remove dust.