Do smoke detectors that are hard-wired need to be replaced?

The U.S. Fire Administration (USFA) encourages homeowners to replace smoke detector batteries (or the backup batteries if you have hardwired smoke alarms) at least once a year and test the alarms monthly to ensure none need to be replaced.

How do you install a hard-wired smoke detector?


  1. Mark Locations for the Smoke Detector Boxes. Find the best locations for the smoke detectors.
  2. Make Cutouts.
  3. Run NM Cable to the First Box.
  4. Run Cables to Other Boxes.
  5. Insert Cables into Electrical Boxes.
  6. Mount the Boxes.
  7. Install Mounting Plates.
  8. Connect the Smoke Detectors.

How often should you change a hard-wired smoke alarm?

10 years old
Your detectors are overdue for replacement, according to the National Fire Protection Association, which recommends that you replace detectors when they’re 10 years old. Top-rated security system experts we interviewed say that, over time, dust gathers inside smoke detectors, desensitizing the sensors.

Which is better hardwired or battery smoke detectors?

Once installed, though, hardwired smoke detectors are better than their battery-powered counterparts in every major aspect—safety, efficiency, maintenance and compliance with local codes.

Can I disconnect a hardwired smoke detector?

Many people consider it a difficult job to do. Most people ask themselves, “can I remove a hardwired smoke detector?” The answer is you can! If you have to stop the hard-wired smoke detectors from beeping, you must unplug them from the clip and remove the battery.

Is firex now Kidde?

The manufacturer of Firex® branded products was acquired by Kidde in 2009. Invensys Controls no longer manufactures or supports these products.

Why do my hardwired smoke detectors keep going off?

A hardwired smoke alarm could go off because of a dead backup battery, power surges, improper installation, dust in the air or humidity.

Which brand is better Kidde or First Alert?

First Alert has better features than the Kidde because of the alarm system with a verbal warning of the threat.

How long do batteries last in hard-wired smoke detectors?

every 6 months
If your alarm is hardwired into your home’s electrical system, replace the backup battery at least every 6 months and replace the smoke alarm itself once every 10 years.