Let's set the scope of the water heater in the bathroom only. And with that factor, we can divide the water heater into the two main groups in term of usability.- Analog system
- Digital system
For each one, the one big different point that you can see in the water heater interface is the different way of interact with water heater. The analog water heater will give the safety feeling more than the digital water heater which have the small button that make the user feel uncomfortable to interact with.
Talk about the temperature indicators, there were three types of temperature indicators which I've seen so far; the level indicator, digital number indicator, and symbolic indicator. The level indicator will have the level of temperature like a thermometer, and in the first time, user will have the problem with this type of indicator when they try to set the suitable temperature because of the indicator give the feeling of thermometer that hard to read the number so the indicator will always come with the level bar which make people easy to recognize. Once the users can grab the feeling of indicator, they can use this type easily.
The digital indicator tell the number of temperature which the user can modify it accurately. And easy to understand how hot of the water.
The symbolic indicator is the one that less accuracy and cannot grab the feeling by the number but by the symbol itselves. And this type is the easiest way to communicate the user while interact with temperature twisted knob.
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