Preheating... Does it still exist?

Warming the H5i
The warm-up feature is used to pre-heat the water before starting treatment.
To start warming:
1. Navigate to the humidity level icon.
2. Push and hold for three seconds. The Warming Up status bar is displayed. You can stop warm-up at any time
by pressing for at least three seconds. You can start treatment at any time by pressing (Start/Stop).
Note: In order to assist the heater plate in cooling, your S9 device will continue to blow air for up to an hour after
treatment has stopped. However, you can unplug the device from the power outlet at any time and allow the heater
plate to cool without air flow.

this is a quote from the H5i users manual

Chris