How to create a smart switch for an electric boiler to save money

My electric water heater consumes a lot of electricity, and it does so at times when it is most expensive. This is because I have dynamic prices which change every hour and I shower at an expensive time. And even if a had a high&low tariff, the problem would still exist.

Most people shower at an expensive moment!

There is more than one way to solve this problem, and I prefer one that is technological in nature.

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