10 Best Hardwired Smoke Detector 2025 in the United States

The FIRST ALERT BRK SC9120FF Smoke and Carbon Monoxide Detector is designed to provide comprehensive safety for your home. It features dual sensing technology, using both an electrochemical sensor for carbon monoxide and an ionization sensor for smoke detection, which ensures accurate identification of potentially hazardous conditions. The unit's interconnectivity allows it to connect with other BRK or First Alert detectors, creating a network of alarms that simultaneously alert you to danger, enhancing home safety.

The hardwired setup with a battery backup ensures continuous monitoring, even during power outages, which is a crucial feature for uninterrupted protection. The alarm volume is notably loud at 85 decibels, providing a clear and unmistakable warning in case of smoke or CO detection. Additionally, indicator lights on the unit's face ensure you can visually confirm the presence of smoke or carbon monoxide.

Although it lacks smart features like app connectivity or voice alerts, it compensates with a user-friendly design. The single test/silence button simplifies operation, while the side-load battery compartment and tamper-resistant locking brackets contribute to straightforward installation. Rigorously tested to meet UL standards, this detector demonstrates reliability and quality, backed by a trusted brand with decades of experience in home safety. The ease of installation further makes it suitable for quick setup, whether by professionals or DIY homeowners. Its strong performance in essential detection and safety makes it a highly reliable option for most households.

The Kidde Hardwired Smoke Detector uses ionization sensing technology, which is effective at detecting invisible fire particles quickly, making it a solid choice for general home fire safety. It runs on your home's 120V electrical system but includes a 9V battery backup, so it keeps working even during a power outage — a key feature for peace of mind. The alarm is loud at 85 decibels, which is enough to wake most people if there’s a fire.

You can connect up to 24 Kidde devices, including smoke, carbon monoxide, and heat alarms, allowing your whole home system to alert you at once. Installation is made easier by a front-load battery door for quick battery changes and a handy test/silence button right on the device to check functionality or temporarily stop false alarms. However, this model does not have advanced smart features like app connectivity or voice alerts, which some newer detectors offer.

It is designed to handle temperatures up to 100 degrees Fahrenheit and fits standard home conditions without issues. This straightforward, reliable smoke alarm is suitable for most households, though those seeking smart home integration might want to explore other options. The product is backed by a 10-year limited warranty, but since it has been discontinued, replacement parts could be harder to find over time.

The Kidde Hardwired Smoke Detector offers several noteworthy features that make it a strong candidate for home safety. It uses photoelectric sensors, which are effective at detecting smoldering fires and less prone to false alarms from cooking. Its interconnectivity feature ensures that if one alarm goes off, all connected alarms will sound, providing enhanced safety throughout your home. The detector is hardwired, meaning it requires installation into your home's electrical system, but also includes a 10-year battery backup, ensuring continued operation even during power outages and eliminating frequent battery changes.

The alarm is loud at 85 decibels, ensuring it will be heard in an emergency. Smart features include LED indicators that provide status updates, reducing the need to guess if the detector is working properly. The detector is designed to be easy to test and silence false alarms, adding to its user-friendly nature. However, the hardwired installation might be challenging for some and might require professional help. Additionally, the detector does not have advanced smart features like remote notifications or integration with home automation systems.

The self-testing feature offers reassurance, though a manual test is recommended weekly. It meets stringent safety standards and comes with a 10-year warranty, which is excellent for long-term reliability. Users who prioritize safety, reliability, and ease of maintenance will find this smoke detector suitable for their needs.