The DVTH full room heater is not your average space heater. The DVTH heaters, with its automatic climate control, eliminates annoying hot and cold cycles by generating just the right amount of heat. The DVTH uses vortex energy efficient technology to fully circulate the warm air throughout the room. Whisper-quiet operation. Advanced safety features such as cool-touch exterior, non-glowing heating element and automatic tip-over and over-heat protection, provide worry-free use at home or office. 5 years limited warranty.