Secure (Horstmann) 425 Tiara - Electro Mechanical 2 Channel Central Heating Programmer. The 425 Tiara programmer is a 2 circuit central heating and hot water programmer, able to switch on and off twice every 24 hours. An advance switch is provided to make temporary overrides to the on or off periods, a selector switch gives further choice of programmes. This unit being branded Secure is the newest available, it is branded Secure only, units branded Horstmann are pre 2020.
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