most efficient space heater

Karl Home 1500-Watt 12.3 in. Electric Wall Mount / Freestanding Ceramic PTC Space Heater with Handle

BLACK+DECKER Electronic Heater with E-Saver Function

Heat Storm 3000W In-Wall Electric Heater with Wi-Fi

White-Rodgers 70 Series, 7-Day Programmable Thermostat, Heat Pump (2H/1C), 1F75H-21PR

Optimus 14 Inch Oscillating Dish Heater in Black

White-Rodgers 70 Series, 7-Day PTAC Programmable Thermostat, 1F75P-21PR

Milex Insta Heater Fireplace – Portable Electric Space Heater with LED Flame Effect & 3 Heat Settings, White

ROVSUN 1500W Wall Heater with Remote, Freestanding & Wall-Mounted Electric Space Heater with Handle, Timer for Indoor, Bedroom

Garage/ Shop Ceiling Mount Utility Heater

Comfort Glow® 5,120-BTU Radiant Quartz Tower Indoor Space Heater, QTH351

BLACK+DECKER™ 1,500-Watt-Max Infrared Quartz Tower Heater

BLACK+DECKER Portable Air Conditioner, 7,500 BTU (5,000 BTU SACC) for Rooms Up To 300 Sq. Ft., Follow Me Remote Control

Heat Storm 1500W Electric In-Wall Heater with WIFI White

Heat Storm A-6000-GC Ceiling Mounted Hardwired 240V Garage Heater Gray

Vie Air 1500W Portable 2 Settings Black Ceramic Heater with Adjustable Thermostat

Optimus Portable Oscillating Ceramic w/Thermostat Heater Grey

EZ Heat Portable Fireplace Fan Heater, 1200W Compact Design with Realistic Flame Effect

Optimus Fan Forced Tower Quartz Heater with Thermostat

EconoHome Wall Mount Space Heater Panel with Thermostat, 600W Convection Heater for Rooms up to 200 Sq. Ft., 120V Electric Heater

ZAFRO Electric Fireplace Stove, Freestanding Electric Fireplace Heater with Adjustable Flame Brightness, Overheating Protection, 1000W/1500W,

Pelonis 22'' Digital Convertible Ceramic Tower Heater

Bestier Electric Fireplace Heater 24.25" with Remote, Adjustable Brightness and Heating Mode, Flame Effects & Log Colors

EZ Heat Personal Ceramic Heater and Fan w/ 1,500W Adjustable Thermostat

Costway 18''Indoor Electric Fireplace Freestanding & Recessed Heater Log Flame Remote 1500W