Smoke, heat & carbon monoxide: what is the difference?

An optical smoke alarm uses a sensing chamber to detect smoke particles. Aico describes its Ei3016 as suited to detecting slow, smouldering fires and lists rooms including bedrooms, living rooms, hallways and landings. Check its instructions for the actual siting requirements. See Aico’s Ei3016 product information.

A heat alarm uses a heat sensor rather than smoke detection. The Aico Ei3014 uses a thermistor that triggers at 58°C; Aico lists it for kitchens and garages. That makes it a different device with a different role, rather than a direct replacement for every smoke alarm. See Aico’s Ei3014 product information.

A carbon monoxide alarm monitors carbon monoxide gas. For example, the Aico Ei208 uses an electrochemical sensor. It does not provide smoke detection and is a standalone unit that cannot interconnect with other alarms. See Aico’s Ei208 product information.

“Multi-sensor” does not always mean the same combination. The Aico Ei3024 combines optical smoke and heat sensing. The Ei3028 combines heat and CO, while the Ei3030 combines optical smoke, heat and CO. Read the exact model description rather than relying on the range name. Compare Aico’s 3000 Series.

Before buying a replacement, check the model number, power supply, sensing type and any interconnection requirements. Alarm location and the correct overall system depend on the property. A competent installer can help you assess that; a product description alone cannot confirm it.

Next: choosing an Aico alarm

Manufacturer information checked 11 September 2026.