The vast majority of space heaters, including ceramic heaters and PTC heaters, are electric resistance heaters. Lasko Ellipse Ceramic Tabletop Heater for $70: This little ceramic number from Lasko was the space heater I kept reaching for while testing dozens of other space heaters last year. Vornado Sensa Cribside Heater: I loved the idea behind this Vornado Sensa Cribside Heater when I tested it: A space heater with an external temperature sensor, with therefore accurate temperature management (hard to find among space heaters!)