emma_hobson

Hi Emma, and WELCOME to the Forum.
You already have two options for your geyser - I am controlling mine via a CBI Astute smart controller such as this: https://www.voltex.co.za/product/cbi-astute-smart-controller-asc-wifi-enabled that works via Wi-Fi. As long as my home router is on, I can access the controller from work and switch the geyser on or off as I like. I can also check the power used for the day, and check daily historical power usage for some months.
Best way to learn is to ask questions right here on the Forum.

And if you don't have wifi maybe something like this will work!
Communica South Africa
MAJ MTD8
Major Tech MAJ MTD8 Timers & Counters Timer 24Hour 7Day ON/OFF Programmer24Hour 7Day ON/OFF Timer Programmer Overview The MTD8 is a 30A 16 On/Off Digital Programmable Timer that is easy-to-use, quick

If you have permanent WiFi at home the easy way if allowed would be to fit a smart MCB at the geyser and you can program your on/off cycles and also via the APP on your phone override it at any time. These units can also measure the power used by the load connected through it.