Horstmann Quartz economy 7 immersion heater controller
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Secure (Horstmann) Electronic 7+ Immersion Heater Control
Horstmann Electronic 7 Water Heater, Multi : Amazon.co.uk: DIY & Tools
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Horstmann ECONOMY7 Immersion, Multi : Amazon.co.uk: DIY & Tools
Horstmann (Secure) Economy 7 Quartz Timer
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Horstmann E7QUARTZ Economy 7 Quartz Electro-Mechanical Immersion Heater Controller With Integral Timer & 60 Minute Boost
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