This bathroom heater heated a 10' x 10' room the most effectively. Far superior to lesser models, The Best unit increased the ambient temperature by 16.9F after one hour, while lesser models only elevated the rooms temperature by 5.1 F. 
Its superior features include an easy-to-use adjustable thermostat, timer, auto-shut off, and an integrated handle for portability. GFCI AC plug.
Measurements- 13 1/4" L x 9" W x 5 3/4" D. (3 lbs.)