Ozz, we have two of these in the office here at the cg (see link)
http://www.amazon.com/gp/product/B00...KRZDC72YQT5KZB
We have issues with one of them, in that there is a cabinet above it. I measured the distance, there's 14-3/8" clearance. I lasered the cabinet the other day when the heater had been fired up for 15 minutes...cabinet bottom was 252 degrees. Heater is mounted into the wall, with 4-1/2" face exposed. These are vent-free, with no fan.
Just an FYI.....
Bill