I emailed Thor and this is their response. Thought I'd share should someone else have this question.
Bob
Good Afternoon Bob,
Heated basement is not a word I would use to describe it, I would describe it as a small / minimal amount of heated air flow is going to the basement, but not warm enough to keep anything from freezing in such frigid temps.
What we like to suggest is a small space heater in the water tank area to keep the lines and tanks from freezing up.
I hope that this answers your question. If you need further assistance please do not hesitate to give us a call.
Thank you
Jaime