Natural Semi Instant Electric Water Heater NE-60 L

I’m using an electric geyser for the first time, and I’ve noticed a few areas that could be improved:

1. The trip indicator light stays on even when the wattage control knob is set to “Off.”
2. It would be much easier to manually set the temperature if the temperature knob had clear markings such as 35°C, 40°C, 50°C, 60°C, and 70°C.
3. Including a user manual inside the box would be highly helpful.