I've had the Quad 2100m for a few years. I got it used and in good shape. It heats my 1000 sq. ft. basement just fine and throws some heat up to the main floor. I needed to use the outside air due to a basement install with external chimney (it was already there) so the optional hookup was nice. If I burn dry wood the glass stays clean - wet wood not so much. Also seems to burn very efficiently and is easy to control. The only thing I don't like about it is the firebrick. It is soft and has started to crumble. I replaced a few bricks but this is reminding me that I wanted to redo them all before winter.
Out of curiosity, how big is the office you are installing in? My 2100 is in an open ~600-700 sqft area and it gets hot. I usually heat that area first and then open the doors to the other 300 or so sqft unfinished part of the basement to even things out. A 3100 in an office may get a bit warm.
Out of curiosity, how big is the office you are installing in? My 2100 is in an open ~600-700 sqft area and it gets hot. I usually heat that area first and then open the doors to the other 300 or so sqft unfinished part of the basement to even things out. A 3100 in an office may get a bit warm.