Product at a glance
This product is discontinued
425 series mechanical programmers are the simplest way to control hot water and central heating in the home. A single circuit time-switch for straight forward, accurate time control. The 425 Coronet is particularly suitable for combi boiler systems, warm air systems and extra zone control.
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|425 Coronet (for loads of 3A or under)*
The above units use the same backplate as H3747 and only require simple wiring changes
|* H3747 is not suitable for immersion heaters
** C1727 backplate change and rewire required (economical option)