Timeguard Suretime 2 Hour Electronic Boost Timer
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heater boost switch – MS Electronics
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Optimum Electronic Boost Timer Universal 15 Mins - 2 Hour Immersion Heater Energy Saving | DIY at B&Q
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2 Hour Boost Timer for Immersion Heater Hot Water Radiator 3kW and Lighting upto 1kW - Including 80W LED : Amazon.co.uk: DIY & Tools
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