10 Best Carbon Monoxide Detector 2025 in the United States

The X-Sense Wireless Interconnected Combination Smoke and Carbon Monoxide Detector offers a comprehensive safety solution, combining smoke and CO detection in one unit. Featuring both photoelectric and electrochemical sensors, it effectively detects smoke and carbon monoxide, ensuring reliable protection. Its standout feature is the wireless interconnectivity; when one unit detects danger, all linked alarms will sound, which is crucial for large homes or buildings, providing full coverage with the ability to link up to 24 units.

The detectors are powered by a long-lasting 10-year sealed lithium battery, eliminating the need for frequent battery changes and ensuring peace of mind. The inclusion of a test/silence button simplifies maintenance, allowing easy testing or silencing of alarms. For installation, the system is straightforward, with batteries and mounting hardware included, making it convenient for users.

Despite its robust features, the X-Sense SC06-W lacks Wi-Fi connectivity, which means it does not offer smartphone alerts or integration with smart home systems. This could be a drawback for tech-savvy users who prefer connected home devices. Additionally, while the alarms are audible, there is no mention of a visual display, which might be a consideration for those with hearing impairments.

This detector is ideal for households seeking a basic yet effective interconnected safety system without the complexities of smart home integration. It provides excellent value for those prioritizing long-term reliability and ease of installation.

The First Alert SMICO100-AC Combination Smoke and Carbon Monoxide Alarm is designed to provide reliable protection for your home. With its ionization sensor, it detects smoke and carbon monoxide effectively, offering dual protection. The hardwired unit comes with a battery backup, ensuring continuous operation during power outages, which is a significant advantage for safety.

Its interconnectivity feature ensures that if one alarm goes off, all alarms in the network will sound, providing comprehensive coverage throughout your home. The Quick Connect Plug feature makes installation straightforward without the need for extensive rewiring, which is convenient for most users. Additionally, the test/silence button allows for easy maintenance and ensures the alarm is functioning correctly.

It is worth noting that being a hardwired unit, it requires a bit more effort during initial setup compared to battery-only models. The ionization sensor is also more prone to nuisance alarms from cooking, although the advanced sensing technology aims to minimize this. If you’re looking for a robust, interconnected smoke and CO alarm with battery backup, this could be a solid choice.

The First Alert Carbon Monoxide Detector CO400 is a reliable, battery-operated device designed to keep your home safe from dangerous carbon monoxide (CO) gas. It uses an electrochemical sensor, which is known for accurate CO detection and is considered one of the best types for this purpose. Because it runs on 4 included AA batteries, it doesn't need to be plugged in or hardwired, making it easy to place anywhere in your home—even during power outages. The alarm is loud at 85 decibels, which is strong enough to wake most people if CO levels become unsafe. It also provides both audible and visual alerts to catch your attention.

A helpful feature is the end-of-life signal that lets you know when it's time to replace the unit, which helps maintain safety without you needing to remember the date. The device comes with a 5-year limited warranty, which is standard for many CO detectors. However, this model does not offer interconnectivity, meaning if you have multiple units, they won’t alert you simultaneously when one detects CO. It also lacks some advanced features like a digital display showing current CO levels, which some users might find useful.

The compact size and no-installation design make it convenient for immediate use, but placing one on each floor and in bedrooms is recommended for full protection. This detector is a straightforward and trustworthy choice for anyone looking for easy-to-use, battery-powered CO monitoring without extra complexity.