Timeguard NTT03 24-Hour/7-Day Compact Electronic Immersion Heater Timeswitch,White

7-DAY DIGITAL IMMERSION TIMER: Designed for domestic immersion heaters, with 4 ON/OFF periods per day. Choose to programme every day the same, weekdays and weekends separately (5+2), or each day individually, so your hot water fits around your routine. 1 OR 2 HOUR BOOST AT THE TOUCH OF A BUTTON: Need extra hot water? Press once for 1 hour or twice for 2 hours, and the heater switches off automatically afterwards. The Advance/Override button lets you skip to the next programme or hold the output permanently ON or OFF. HASSLE-FREE CLOCK WITH BATTERY BACKUP: A built-in rechargeable battery keeps the clock running and your programmes saved during a power cut. Optional automatic summer/winter time changeover means no adjusting the clock twice a year. POWERFUL 16A RELAY: Rated for 16A resistive loads, making it ideal for immersion heaters, with switching times accurate to the minute. The illuminated screen and power and output LEDs show what's happening at a glance, and a programme review lets you check your settings anytime. COMPACT DESIGN, 3 YEAR GUARANTEE, PROFESSIONAL INSTALLATION RECOMMENDED: Fits a single gang wall box with a minimum depth of 32mm and is backed by Timeguard's 3 year guarantee and UK helpline. Installation by a qualified electrician is recommended. Not suitable for use with discharge lighting.