You can only use a different brand if your smoke detectors are standalone, battery-operated units. If your detectors are hardwired together so that if one goes off, they all sound, you must use the same brand.
In most cases, different brands of hardwired smoke detectors do not work well together.
You can mix smoke detector brands if they are standalone (battery-powered) alarms, but never mix brands if your detectors are interconnected. For interconnected systems, different manufacturers use different communication signals, meaning a First Alert detector may not trigger a Kidde alarm during a fire.
The primary smoke detector that works with Google Nest is the Google Nest Protect (2nd Gen), which is designed for full integration with the Nest app, phone alerts, and other Nest devices. As an alternative, the First Alert SC5 Smart Smoke & CO Alarm is an officially recommended partner that works alongside Nest Protect in the Google Home app.
When interconnected smoke alarms are installed, it is important that all of the alarms are from the same manufacturer. If the alarms are not compatible, they may not sound. There are two types of smoke alarms – ionization and photoelectric.
Firefighters recommend dual-sensor smoke alarms (which combine both photoelectric and ionization technology) or interconnected alarms. They also stress that the brand matters less than choosing models featuring 10-year sealed batteries and ensuring you have detectors on every floor and outside all sleeping areas.
Yes, you can replace a single hardwired smoke detector. However, because your alarms are likely interconnected, there are two crucial rules you need to follow to ensure your home remains safely protected.
If you are replacing an expired Nest Protect, the recommended replacement is the First Alert SC5 Smart Smoke & CO Alarm. This device was developed in collaboration with Google and is designed to act as a seamless, direct swap for Nest Protects on your existing mounting plates and wiring harnesses.
This requirement is commonly called the Point 7 (0.7) Rule. The most common application of the Point 7 Rule is smoke detectors in corridor applications. Applying the Point 7 Rule allows spacing between smoke detectors to be extended beyond 30 feet in corridors that are less than 30 feet wide.
The best smoke detectors for your home depend on your wiring and smart home preferences, with top experts recommending models from Google Nest, Kidde, and First Alert.
The US National Fire Protection Association (NFPA) have issued NFPA Standard 72, National Fire Alarm and Signalling Code, which states that all smoke alarms (including alarms that use 10 year batteries, and those that are hard wired) should be replaced when they are ten years old, or sooner if they don't respond ...
First Alert and Kidde smoke and CO detectors are not directly compatible out of the box. They use different mounting brackets and wiring harnesses.
Mixing brands of interconnected hardwired smoke detectors is not recommended. If one alarm triggers, it sends a low-voltage communication signal down an interconnect wire to trigger the others. Because communication signals and protocols are proprietary, different brands may not trigger each other during an emergency.
The short answer is this: sometimes you can replace a hardwired smoke detector yourself, but many homeowners should call a licensed electrician to make sure the replacement is safe, compatible, and working properly. That matters because hardwired smoke detectors are tied into your home's electrical system.
Fake smoke detectors—which are typically disguised hidden cameras—can be identified by inspecting the device's flashing lights, pushing the test button, and looking for an unnatural camera lens. You can check for hidden cameras by turning off the lights to look for infrared (IR) night vision glares or using a smartphone camera.
Most smoke detectors have a lifespan of 10 years from the date of manufacture. After a decade, the internal sensors lose sensitivity and become unreliable. Combination smoke and carbon monoxide (CO) detectors usually have a shorter lifespan of 5 to 7 years.
Place smoke detectors at the top of each stairwell and at the end of each long hallway. Smoke rises easily through stairwells. If you should put a smoke detector in your kitchen, be sure to keep it away from cooking fumes or smoking areas.
Many fire departments offer smoke alarm installation and testing services, often for vulnerable groups or as part of a wider fire safety initiative.
Make sure you turn off that breaker before you do it. Smoke detectors are easy to replace however the new models may not be compatible with the existing base and plug. Be prepared to disconnect the wires and add the new plug connector.
Google officially stopped producing the Nest Protect connected smoke detector in March. Existing units will continue to function, but because the smoke detectors have a 10-year lifespan beginning at their manufacture date, older units have started to expire.
Your new First Alert SC5 Smart Smoke & CO Alarm will work seamlessly alongside your other Nest Protect devices and will work with the Google Home app.
While some of these tasks can be done by yourself, it is better to hire a professional electrician to install smoke detectors in your home. Fire alarms save lives, make sure you have one install correctly which will do the job.
Yes, you can replace a hardwired smoke detector with a different brand, provided it is not part of an interconnected system. If your detectors are interlinked so that one going off triggers all the others, it is highly recommended (and sometimes required) to use the same brand to ensure the signal protocols communicate properly.
A hardwired smoke detector is likely bad or at end-of-life if it chirps persistently despite fresh batteries, fails to sound during a manual test, or is over 10 years old. Yellowing plastic, frequent false alarms, or lack of a power-indicator light also indicate it needs replacement.