From the manufacturer Ener-G+ Infrared Electric Indoor/Outdoor Freestanding Heater About Us Ener-G+ products use alternative energy or other power sources to the ones commonly used. These products are environmentally responsible and bring effective solutions for today's customer needs Ener-G+ HEA-21821SH-T Freestanding Heater Model HEA-21821SH-T The highly energy efficient, EnerG+ 1500 Watts Electric Outdoor Infrared Standing Heater runs on regular household electric current and it plugs into a standard 110/120 Volt outlet and substantially less expensive to operate than propane patio heaters. * Adjustable Height: 66 - 80 inch * Instant Heat: Takes 5 seconds to heat up * Double Heat Settings: 700, 800 or 1500 Watts * 1500 Watts * 6 inch power cord * Tip-Over and Over-Heat protection Why Should You Buy the Ener-G+ Infrared Electric Indoor/Outdoor Freestanding Heater?