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What is the difference between a smoke alarm and heat alarm?

General

11 September 2024

Last Updated: 22 April 2026

A smoke alarm detects smoke particles using an optical or ionisation sensor, while a heat alarm detects temperature changes using a thermistor. Smoke alarms are designed for bedrooms, hallways and living rooms. Heat alarms are designed for kitchens, garages and utility rooms where smoke alarms would trigger false alarms from cooking or fumes. Most homes need both types for full coverage. See our guide on what fire alarms to install and where.

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