We recently purchased a seasonal camp and it came with an electric composting toilet. The prior owners have passed away and there doesn’t seem to be any obvious identification on the unit. I think that it is between 7 and 20 years old based on how long they owned the property. It looks similar to the San-mar style. When the power is turned on I can hear the fan running. I was just wondering if the fan runs continually or just once in a while and does it have an internal heating element to help with the decomposition process. If so does that run continually also. We will be living there permanently in about one week and would appreciate any information about what model it is so we know how to use and maintain it. Please see attached photo.