OCS-I build in control sauna heater Oceanic OCS- built in control sauna heaters are available from 3kw to 9kw,mainly for domestic user. Oceanic built in control sauna heater with external temp sensor ,so the temperature control for sauna room is very accurate Oceanic built in sauna heater controlled by circuit board, it is much more reliable Digital display temperature and time Customer can preset the working time and the waiting time, double mode Sequential heating system to save energy and prolong the main parts'life Diagnostics - 6 LEDs on the controller show different working stages and operations for elementary diagnosis if a problem should occur. Extra switch for power supply control High temperature cut-off for both sauna room and sauna heater. Double safety protection Stainless steel shell is optional Every Oceanic sauna heater is subjected to 5 strictly controlled tests: 1. 48 hour continual test for circuit board 2. Controller is tested for all functions 3. High voltage test 4. Earthing resistance test