Nine flame colors with an automatic cycle mode and five brightness steps give this 18-inch insert more visual range than its footprint suggests. It puts out 5000 BTU on 1400 watts, warming roughly 400 square feet, and the thermostat holds anywhere from 62 to 82 degrees Fahrenheit. The cabinet is only 19.17 by 5.12 by 16.93 inches and weighs 11 pounds, so one person can hold it in an opening while driving the screws. Overheat protection shuts the heater down if the vent is obstructed. A remote is included, though the two AAA cells for it are not. Assembly is limited to mounting. It suits a small bedroom, a home office or an apartment wall where a full-width unit would dominate.