https://www.sentiotec.com/en/categories/harvia-austria-sauna/steuerungen/professional_d2_master

Innovative technology in the PRO D2:

2-part sauna control unit (up to 4 sauna operating units can be used)
Patented technology
Installation of the operating unit possible inside and outside the sauna
Maximum switching load of the heating system: 10.5 kW
Light and fan switchable and dimmable (max. 100 W)
Heating time limit can be raised for commercial use (6/12/18/24 h)
Energy-efficient electronics
Connection for the safety devices or door monitoring
Single or dual sensor system
Digital and precise-to-the-minute time preset
Digital temperature preset and temperature display
Remote start via potential-free contact
Eco mode
Status output
Connection of an additional power booster (required for electric heaters with outputs of more than 10.5 kW)
User profiles
Innovative technology in the PRO D2i (in addition to Pro D2):

Additional output switchable up to 3.5 kW or 500 W dimmable (for infrared heater, for example, or infrared heater panels)
Optional: Additional output control panel