Smoke Detectors
Smoke alarms from Kidde, First Alert, BRK, Resideo and Mircom: battery, 10-year sealed battery and 120V hardwired models, photoelectric and ionization sensors, strobe and voice alarms, smoke and CO combination units and heat detectors. Replacing hardwired alarms? Match the model or check the listing for the units it replaces.
Our most popular brands are Kidde smoke detectors and First Alert smoke detectors. Want smoke and CO in one unit? Shop smoke and carbon monoxide alarms. For CO-only alarms, see carbon monoxide detectors.
Smoke alarm guide: sensor type, power and replacement ▾
Photoelectric or ionization?
Photoelectric alarms generally respond faster to slow, smouldering fires, while ionization alarms generally respond faster to fast, flaming fires. Many fire safety organizations suggest having both types, or a dual-sensor alarm. Combination smoke and CO alarms add carbon monoxide detection in the same unit.
Battery or hardwired?
Battery alarms mount anywhere; 10-year sealed battery models need no battery changes for the life of the alarm. Hardwired 120V alarms connect to household wiring, often interconnect so all sound together, and have a backup battery. When replacing a hardwired alarm, check whether the new model fits your existing connector, and have a licensed electrician do any new wiring.
Heat detectors
Heat detectors (such as the Kidde HD135F or Mircom 135°F models) sound when the temperature reaches a set point. They suit spaces like garages or attics where smoke alarms may false alarm, but they do not replace smoke alarms in living areas.
Placement and replacement
Canadian fire codes generally require a working smoke alarm on every storey and outside sleeping areas; check your provincial and local requirements. Test alarms monthly. Smoke alarms should be replaced about every 10 years: check the manufacture date on the unit and follow the manufacturer's instructions and your local fire code. An alarm gives early warning; it is one part of a home fire safety plan.
