Does anyone know the answer to this question? We bought this unit May 2008 this is a 2009 unit.....and at the time we were told it was a heated underbelly ( by the dealer sales dept) the website for Sundance also appeared to be saying it was, I called our dealer's service dept and he could not say for sure but didn't think so, we are having it de winterized for a trip from IL to Tx we really enjoyed this unit all last year. We camp spring,summer,and fall would camp in winter if we lived somewhere warmer than IL ....now I am worried about things freezing up on us if the underbelly is not heated...the dealer service guy said if we keep the heat at like 55 it should be ok ......are my pipes gonna blow?