Designed for use with Economy 7 off peak rate overnight electricity plans with the flexibility of pre-selected timing options manually adjustable to allow customised programming. Alternatively press the Boost button for instant ON/OFF control and walk away knowing you’re saving energy and money! Interchangeable with Sangamo and Horstmann Economy 7 units. Suitable for use with single, dual or twin element immersion heaters.  Designed for use with Economy 7 off peak rate overnight electricity plans.  Pre-programmed automatic boost and three on-demand options – 30 minutes, 1 & 2 hours.  Countdown boost display shows boost time remaining.  Automatic summer/winter changeover.  2 year factory fitted battery for memory backup.  Fits and supplied with a standard size Economy 7 wall box.  Accommodates up to 3 off-peak hot water or heating periods every 24 hours.  Easy view 12 hour am/pm clock/timer display illuminates settings.  Simple push button setting and select modes.  IP30 enclosure protection and class 1 shock protection.  Contact rating: 13A suitable for immersion heaters up to 3kW.  Operating temperature: 0°C to +35°C.  Contact type: Micro-disconnection ON control.  Disconnection to immersion heater(s) via double pole rocker switch.