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10 Best Natural Gas Alarms 2025 in the United States

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Our Top Picks

#1

Winner

Kidde Carbon Monoxide Detector, Propane, Natural, Methane, & Explosive Gas Alarm, Plug-In Wall with 9-Volt Battery Backup, Digital LED Display

Rating
9.9
Chosen by1,111
Sensitivity Level
Power Source
Alarm Type

Most important from
16187 reviews

Sensitivity Level
It started reporting CO levels at around 40 ppm, which steadily climbed until the alarm sounded at about 100 ppm.
Power Source
Plugs directly into an outlet, or you can detach the power supply and mount the alarm away from the outlet.
Alarm Type
Alarm is loud enough to hear in the house, eight feet away.
Installation Location
The perfect alarm for a detached garage. Detects smoke, CO, natural gas, and propane, with a display showing levels even when they're too low to trigger the alarm.
Additional Features
Great peace of mind to know that both carbon dioxide and all forms of natural gas will be monitored.

The Kidde Carbon Monoxide Detector is a versatile device that detects carbon monoxide, propane, natural gas, methane, and other explosive gases. One of its main strengths is its ease of installation—simply plug it into any standard 120V outlet. It also features a 9-volt battery backup, ensuring protection even during power outages, which is a crucial aspect for consistent safety.

The digital LED display is particularly user-friendly, as it shows the level of carbon monoxide detected or indicates 'GAS' when explosive gas is present, giving clear and immediate information. The 85-decibel alarm is loud enough to alert you to danger, even in a sleep-induced state. Additionally, the Peak Level Memory function records the last detection of carbon monoxide, which can be helpful for tracking exposure over time.

One potential drawback is that it requires a 9V battery, which, although included, needs periodic replacement. The device’s compact size and lightweight design make it easy to place in various locations around your home, but it does need to be within reach of an electrical outlet. With an operating range between 5% to 95% relative humidity and a temperature rating up to 100 degrees Fahrenheit, it is suitable for various environments. The 5-year limited warranty also adds a layer of assurance regarding its durability and performance.

Rating
9.9
Chosen by1,111
Sensitivity Level
Power Source
Alarm Type

Most important from
16187 reviews

Sensitivity Level
It started reporting CO levels at around 40 ppm, which steadily climbed until the alarm sounded at about 100 ppm.
Power Source
Plugs directly into an outlet, or you can detach the power supply and mount the alarm away from the outlet.
Alarm Type
Alarm is loud enough to hear in the house, eight feet away.
Installation Location
The perfect alarm for a detached garage. Detects smoke, CO, natural gas, and propane, with a display showing levels even when they're too low to trigger the alarm.
Additional Features
Great peace of mind to know that both carbon dioxide and all forms of natural gas will be monitored.
#2

TopTes PT199 Natural Gas Leak Detector with Audible & Visual Alarm, Portable Gas Sniffer to Locate Combustible Sources Like Methane, Propane for Home(Includes Battery x2)-Orange

Rating
9.8
Sensitivity Level
Alarm Type
Additional Features

Most important from
5934 reviews

Sensitivity Level
Its sensitivity and accuracy are impressive, detecting even the smallest traces of natural gas quickly.
Alarm Type
The audible and visual alarms provide clear and immediate warnings, enhancing safety and reassurance.
Additional Features
The easy-to-read LCD screen simplifies monitoring gas levels and taking prompt action.

The TopTes PT199 Natural Gas Leak Detector is a portable device designed to detect a range of combustible gases, including natural gas, methane, propane, and butane. One of its major strengths is its quick response time; it triggers both visual and audible alarms within 0.5 seconds of gas detection. The alarm intensity increases with the concentration of gas, and the LCD screen turns red at higher gas levels, making it easier to identify the severity of the leak swiftly.

This device's sensitivity range is 50-1,000 ppm, and it works effectively within a detection distance of 1-5 cm, which helps pinpoint exact leak locations. The sensor type is Gas Sensitive Semiconductor (GSS), known for its reliability in gas detection. Powered by 2 AAA batteries (included), the detector is ready to use after a brief 30-second warm-up and features a low battery indicator, adding convenience.

Its compact and lightweight design makes it easy to carry and store, appealing to homeowners, RV owners, and DIY enthusiasts. However, the device will auto-power off after 5 minutes without operation or gas detection, which might be inconvenient if you’re in the middle of a thorough inspection. Additionally, its operation is limited by an upper temperature rating of 122 degrees Fahrenheit and 95 percent humidity, so it may not be suitable for all environments. Despite these minor drawbacks, the TopTes PT199 is a handy and affordable tool for anyone needing to detect gas leaks efficiently and ensure safety in their living spaces.

Rating
9.8
Sensitivity Level
Alarm Type
Additional Features

Most important from
5934 reviews

Sensitivity Level
Its sensitivity and accuracy are impressive, detecting even the smallest traces of natural gas quickly.
Alarm Type
The audible and visual alarms provide clear and immediate warnings, enhancing safety and reassurance.
Additional Features
The easy-to-read LCD screen simplifies monitoring gas levels and taking prompt action.
#3

PT520A Natural Gas Detector, Gas Leak Detector with 17-Inch Gooseneck, Locating The Source Like Propane, Methane, and Butane for Home and RV (Includes Battery x3) - Orange

Rating
9.6
Sensitivity Level
Power Source
Alarm Type

Most important from
3277 reviews

Sensitivity Level
Detects small gas leaks quickly, providing early warnings that can prevent serious hazards.
Power Source
Its portability and battery-powered design allow for convenient use without needing a power source.
Alarm Type
Visual alerts combined with a loud alarm ensure you won’t miss any gas detection warnings.
Installation Location
The flexible 17-inch probe enables reaching difficult spots where leaks often hide.
Additional Features
Extremely easy to operate with straightforward instructions, making it accessible even for non-professionals.

The TOPTES PT520A Natural Gas Detector is designed to quickly spot leaks of gases like methane, propane, and butane, making it a useful tool for homeowners and RV owners concerned about gas safety. Its electrochemical sensor is sensitive to a wide range of gases, with a fast response time of just 0.5 seconds, helping you catch leaks early. The 17-inch flexible gooseneck probe is a standout feature, allowing you to reach into tight or awkward spots such as pipes or storage tanks where leaks might hide. It offers clear visual alerts through 7 colored bars and a loud 75dB alarm that intensifies with higher gas levels, ensuring you won’t miss a warning.

Being battery-powered with three included AAA batteries makes it portable and easy to use without needing a permanent power connection. Additionally, the device offers user-friendly controls like an auto power-off to save battery and a mute button for silencing the alarm when necessary. Its compact size and non-slip design add to its convenience during inspections.

The detection range is quite close (1 to 5 cm), meaning you need to be near the suspected leak to get accurate readings. It requires a brief 30-second warm-up before use, which might feel like a delay in urgent situations. While the upper temperature rating of 122°F suits most indoor environments, it may not perform as well in very hot conditions. The PT520A serves well as a simple, portable, and responsive natural gas detector for home or RV safety checks, but it is best used as a diagnostic tool rather than a continuous monitoring system.

Rating
9.6
Sensitivity Level
Power Source
Alarm Type

Most important from
3277 reviews

Sensitivity Level
Detects small gas leaks quickly, providing early warnings that can prevent serious hazards.
Power Source
Its portability and battery-powered design allow for convenient use without needing a power source.
Alarm Type
Visual alerts combined with a loud alarm ensure you won’t miss any gas detection warnings.
Installation Location
The flexible 17-inch probe enables reaching difficult spots where leaks often hide.
Additional Features
Extremely easy to operate with straightforward instructions, making it accessible even for non-professionals.

Buying Guide for the Best Natural Gas Alarms

Choosing the right natural gas alarm is crucial for ensuring the safety of your home or business. Natural gas alarms detect the presence of gas leaks and alert you before they become dangerous. When selecting a natural gas alarm, it's important to consider several key specifications to ensure you get the best fit for your needs. Here are the key specs to look for and how to navigate them.
Sensitivity LevelSensitivity level refers to how much gas concentration the alarm can detect. This is important because a more sensitive alarm can detect smaller leaks, providing earlier warnings. Sensitivity levels are usually measured in parts per million (ppm). Alarms with lower ppm thresholds are more sensitive. If you want maximum safety, choose an alarm with a lower sensitivity level. For general home use, a moderate sensitivity level is usually sufficient.
Response TimeResponse time is the amount of time it takes for the alarm to activate once it detects gas. This is crucial because faster response times mean quicker alerts, allowing you to take action sooner. Response times can vary from a few seconds to several minutes. For high-risk areas or if you want the quickest possible alert, choose an alarm with a faster response time. For less critical areas, a slightly slower response time may be acceptable.
Power SourceThe power source of a natural gas alarm can be either battery-operated or hardwired. Battery-operated alarms are easier to install and can be placed anywhere, but require regular battery changes. Hardwired alarms are connected to your home's electrical system and may offer more reliability but require professional installation. Choose a battery-operated alarm for flexibility and ease of installation, or a hardwired alarm for a more permanent solution.
Alarm TypeAlarm type refers to how the device alerts you to the presence of gas. Common types include audible alarms, visual indicators, and smart alarms that send notifications to your phone. Audible alarms are loud and can wake you up, visual indicators are useful for the hearing impaired, and smart alarms offer convenience and remote monitoring. Choose the alarm type based on your personal preferences and needs. For comprehensive safety, consider a model that offers multiple types of alerts.
Installation LocationWhere you install your natural gas alarm can affect its performance. Some alarms are designed for specific locations like kitchens or basements, while others can be placed anywhere. It's important to install the alarm in areas where gas leaks are most likely to occur. For general home use, place alarms near gas appliances and in rooms where gas lines are present. For businesses, consider areas with high gas usage or storage.
Additional FeaturesAdditional features can enhance the functionality of your natural gas alarm. These may include features like self-testing, battery backup, and connectivity to home security systems. Self-testing ensures the alarm is always working, battery backup provides power during outages, and connectivity allows for integrated safety solutions. Choose additional features based on your specific needs and preferences for added peace of mind.

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