NewAir has a few highly rated models that can be found online, including the NewAir Hardwired Ceiling Mounted Electric Shop Garage Heater. On Home Depot's website, the heater has a 4.1 out of 5 ...
Check Price This garage heater from Farenheat is one ... 14.5" by 13" by 14.5" and is UL/CUL listed as a wall or ceiling mounted heater. The company includes a bracket for easy mounting.