XUELILI Smart Immersion Heater Timer Switch, 2.4Ghz WiFi Water Heater Switch, Smart Wall Touch Boiler Switch with Timer Works with Alexa, Google Home and Smart Life APP, White, 20A, 4400W

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I understand what you are saying here but the situation nowadays is much more complex because of the way that companies bill customers. Plus the dizzying number of tariffs available makes it difficult to compare. Since you can have washing machines etc with built in delays so that they can use night time rate it is possible to make E7 work for you without using it for heating. Combined with your property insulation strategy, economic control of energy usage with timers is an efficient way to keep control of energy bills.

Since, in this case, the hot water is being heated electrically it is possible to obtain an E7 tariff that provides cheaper hot water than a single tariff without the extra expense.I agree that some single tariffs are apparently cheaper than E7 during the day but alot are not. If you take into account the fact that many tariffs (including single) have a low usage penalty for the however many kWhs (as high as 900kWh) then when this is taken account of the difference is very small. Immersion Heat Timer SolutionsThanks to advanced technology, intelligent appliance control is more flexible and versatile than ever. Our comprehensive range of immersion heat timers starts with neat and discreet plug-in models, with touch-control override for anything from warming up a room to regulating the time kids spend online. For more complex control systems, select from our range of multi-channel controllers for newly-installed and existing heating and hot-water systems.