HOW TO - Basic Installation of HGX Steam Generator

Harvia HGX is an oasis of relaxation and good feeling. Let the humid heat pamper your senses and forget time and rush for a moment.
Harvia HGX is a compact, yet efficient steam generator for private and spa use. The main design principles have been reliability, trouble-free operation and the relaxing steam bath experience.
Harvia HGX is easy to install. Because of its compact design it can be installed in a low space. Harvia HGX steam generator is controlled by a stylish touch-screen control panel. The controlled functions are steam generator, fragrance pump, lighting and fan.
Models: HGX2, HGX45, HGX60, HGX90, HGX11 and HGX15. Up to 3 HGX11L extra power units can be linked with basic steam generator to be controlled with same control panel.

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After self draining will it fill up immediately or stays empty until used again?