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