Eclipse Electric Convector w/ Built-In Thermostat 750 W

Sleek and compact electric convector heater with built-in thermostat. Reduced length provides improved efficiency due to vertical air flow (42% shorter than conventional electric convectors). Heats up to 40% more quickly than a conventional convector by circulating air faster and more uniformly throughout the room for increased comfort. Extremely accurate built-in electronic thermostat with heat proportioning for up to 33% reduced energy costs. Heavy duty steel (20-gauge) design. Epoxy polyester coating resistant to abrasion. Overheating protection. Spacers included (optional installation). White. Built-in thermostat included.

Getting the heating capacity you need
The general rule for electric heating is to use 10 watts of heat per square foot of space i.e. 1000-watt heater will heat 100 square feet (10 ft. x 10 ft.).
The heating capacity will vary depending on many factors like insulation effectiveness, number and size of windows, etc.