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Flood sensors come in all varieties, but they pretty much all work using the same mechanism: when water touches two exposed metal probes, the device senses increased conductivity between those probes and sets off an alarm. It's a simple idea that can potentially save you thousands of dollars.

There are two common types of heat detectors: fixed temperature and rate of rise. Both rely on the heat of a fire incident to activate the signal device. Fixed-temperature detectors signal when the detection element is heated to a predetermined temperature point.

Heat alarms are recommended for kitchens. All alarms should be interconnected to ensure audibility throughout the property in event of an alarm being triggered.

A heat detector is usually used in rooms where there is excessive dust or fumes for instance, a garage or cellar which a smoke alarm can mistake for dust, soot or combustible elements in the atmosphere. It's also used in rooms where highly-flammable chemicals are stored.

Smoke alarms detect smoke fit them in all rooms where a fire might start. But in smoky or steamy rooms like kitchen or bathroom, a heat alarm is more suitable. These alarms go off when the room reaches a certain temperature.

Electro-pneumatic heat detectors contain a diaphragm which moves when there is a change in pressure owing to a shift in the ambient temperature. When the diaphragm moves, an electric circuit is completed, which activates the alarm. Rate of Rise or ROR heat detectors operate using two heat-sensitive thermocouples.