Contract Heating can Install Smoke and Heat Detectors at your property at the same time as other work is being undertaken. Our fully qualified electricians can suggest the best location to have detectors fitted, as certain alarms can be triggered by various activities, such as cooking. The biggest advantage to having detectors wired into the main power supply is that there is no need to worry about battery life if they go flat the detectors will still work; however, they must be replaced as a backup power supply in case of power failure. You also need to be aware that even mains-powered detectors only have a certain shelf life.