Ok I'm sorry but this just makes no sense to me. There is no reason to unplug a heater to lower the temperature. For $40 you can get a wifi controller and change the temp anywhere in the world. Or adjust the thermostat on your heater. Unplugging it is just asking for trouble unless you have a low temp alarm. I have to run a chiller in the summer and I still leave my heaters plugged in.
Yuuup. It's kind of infuriating, every summer people start posting about how they unplugged their heaters because their tank is hot. WHY? That's literally what the thermostats are for. It's not costing you any electricity, it's not heating your tank...