DIY Frequently Asked Questions / What’s the difference between a ionization and a photoelectric smoke detector and where should they be used?
A photoelectric fire alarm is designed to detect a smoldering fire more quickly than an ionization smoke detector will. It should be used in rooms where there is a lot a carpet and upholstery, such in in living rooms, family rooms and bedrooms. Ionization smoke detectors are designed to detect flaming fires, that are more likely to start in kitchens and garages.