Product review (4 stars): Great unit
Hate to knock a star off because this unit is rock solid.  I have it in a basement though and it constantly makes this weird gulping sound when most of the environment is quiet.  It is not loud by any means...but you will think something is happening with your plumbing or something.  Solid unit overall...I didn't hesitate to buy a 2nd one when I had a need for one.