Space heaters that plug in to the wall are a safe and easy to use option for heating a single room; types include convection, ceramic and radiant heaters, each of which are best suited to certain use cases. Additional space heaters are required for multiple rooms.
As of February 2015, the space heater that provides the most value is the Lasko 754200 model, according to bestreviews.com. This ceramic model is portable and features an adjustable thermostat and cool touch settings, as well as many other features. This unit gives an output of heat at 1500 watts on a high setting and 900 watts on a low setting.
While ceramic models are appropriate for small rooms and spaces, radiant models such as the DeLonghi EW7707CM are better suited for medium-sized rooms. Features for the DeLonghi EW7707CM include automatic turn-on when the temperature reaches 44 degrees, 1500-watt heating and automatic maintenance for a constant temperature of 68 to 70 degrees.
Large rooms are best served by convection space heaters, which heat the air gradually through a coil or other heating element. A popular model featured on sylvane.com is the Vornado Touchstone Vortex Heater TVH600. This model features 5,118 BTUs, two settings and an adjustable thermostat. This unit automatically shuts off if it becomes overheated or if it is tipped over.