The ELECTRONIC 7 is a Immersion Heater Control which features a contemporary look with an easy to read, large back lit display. The Electronic 7 is compatible with most cheap rate or off-peak tariff arrangements and is fully compatible with all past and present Horstmann Economy 7 controllers. Additional off-peak settings are available to take advantage of the latest off-peak tariff arrangements. It is suitable for use with cheap rate overnight tariffs such as Economy 7 or similar to provide a tank full of hot water each morning.