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Horstmann ELECTRISAVER E15 Push Button Electronic Run-Back Timer With 15-60 Minute Boost Control Suitable For Immersion Heaters - Fits 1 Gang Box 3kW - Internet Electrical
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Horstmann E7QUARTZ Economy 7 Quartz Electro-Mechanical Immersion Heater Controller With Integral Timer & 60 Minute Boost - Shop4 Electrical
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SPARES2GO Energy Saving 15 Minute to 2 Hour Electronic Boost Timer for Immersion / Room Heater : Amazon.co.uk: DIY & Tools
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