10 Best Home Gas Detectors 2025 in the United States

The First Alert BRK SC9120FF is a hardwired smoke and carbon monoxide detector equipped with battery backup, ensuring continuous operation even during power outages. It uses electrochemical technology for CO detection and ionization sensors for smoke, offering reliable and effective monitoring of two critical home safety concerns. The alarm emits a loud 85 decibel siren and features indicator lights to clearly signal the presence of smoke or CO.

Users can connect this detector to other compatible BRK or First Alert alarms, creating an integrated alert system throughout their home, which is a significant safety advantage. Installation is straightforward with tamper-resistant locking brackets and universal mounting brackets. It also includes a single test/silence button and side load battery compartment for ease of use and maintenance.

As a hardwired device, installation may require professional assistance for those unfamiliar with electrical wiring. The unit's reliance on a 9V battery for backup may necessitate periodic replacements, unlike models with longer-lasting battery options. This detector is well-suited for homeowners who prioritize comprehensive safety coverage and reliable performance, making it a trusted choice.

The First Alert CO605 Plug-In Carbon Monoxide Detector with Battery Backup is designed to keep your family safe by detecting dangerous levels of carbon monoxide (CO). This device can be easily plugged into any standard outlet and includes a battery backup to ensure continuous monitoring even during power outages. The advanced electrochemical sensor technology is highly accurate, regardless of where the detector is placed in a room, ensuring reliable detection of CO levels. When dangerous levels are detected, the detector emits a loud 85-decibel alarm to alert you promptly.

Additionally, it features a single test/silence button for simplicity and a low battery signal mute option that temporarily quiets the alert for up to 8 hours. For optimal safety, it's recommended to install one detector on each level of your home and in every bedroom. The product is compact with dimensions of 1.38 inches deep, 5 inches wide, and 3.4 inches high, and weighs just 4.2 ounces. The seven-year limited warranty and end-of-life signal chirp ensure long-term reliability and timely replacement.

A key advantage is its compliance with UL standards, which speaks to its quality and reliability. However, some users might find the need for multiple units a bit inconvenient and the constant need for battery replacements could be seen as a drawback.

The BW Technologies XT-XWHM-Y-NA GasAlertMax XT II 4-Gas Detector is designed to detect multiple gases including H2S, oxygen (O2), carbon monoxide (CO), and combustible gases, making it suitable for both natural and industrial environments. It utilizes electrochemical cell sensors for measuring H2S and CO levels, while oxygen levels are measured using a capillary-pore fuel cell and combustible gases are detected with a catalytic bead sensor. This combination of sensor technologies ensures accurate and reliable detection of various harmful gases. The device features audio, visual, and vibration alarms that activate simultaneously to alert users when gas concentrations reach dangerous levels.

Additionally, the integrated diaphragm pump allows for localized sampling, providing precise readings compared to diffusion-based methods. The LCD screen displays real-time gas concentrations, battery status, and the condition of calibration and sensor self-tests, which enhances user confidence in its operation. Powered by a lithium-ion battery, the device is portable and easy to set up, although batteries are not included. It's compact and lightweight, with dimensions of 3 x 3 x 6.5 inches and weighing only 1 pound, making it easy to place around the home.

The detector is designed to operate in a wide temperature range (-4 to 122 degrees Fahrenheit) and can handle 100 percent humidity, ensuring it functions under various environmental conditions. The absence of included batteries may be an inconvenience for some users. This gas detector is a solid option for those needing reliable and multi-gas detection, particularly in safety-sensitive areas.