most efficient space heater

LifeSmart LifePro 1500 Watt Portable Electric Infrared Quartz Space Heater for Indoor Use with 6 Heating Elements, Wheels, and Remote, Brown Oak Wood

Karl Home 1500-Watt Portable Electric Space Heater with 3D Flame and Handle

DeLonghi Radiator Heater: Oil Filled, Electric Space Heater, Indoor Use, Programmable Timer, 3 Settings, 1500W, ETL Listed

Karl Home 1500-Watt 25 in. Portable Electric Tower Space Heater with 3D Flame 60° Oscillation

BLACK+DECKER™ 1,500-Watt-Max Personal Desktop Heater with Fan Setting (Black)

VOLTORB Freestanding Portable Electric Corded Space Heater with 6 Infrared Quartz Heat Element, LED Display, Remote Control & Fan Only Mode, Black

LifeSmart 1500 Watt Portable Electric Infrared Quartz Space Heater for Indoor Use with 4 Heating Elements and Remote Control, Black

Portable Small Space Heater, 2-in-1 Fast Heating Ceramic Desk Heater & Fan, Overheat & Tip-Over Protection, for Office, Room, Under Desk Use

Etust Electric Fireplace Heater, 3D Flame with Adjustable Brightness, Timer & Safety Protection, Indoor Space Heater 22.3"

Sengoku KeroHeat Indoor Outdoor Portable Convection Kerosene Heater 23,500 BTU

Etust 16" Wood Cabinet Space Heater, 1500W Infrared Heater with Thermostat, Portable Electric Heater for Indoor Use

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

Karl Home 1500-Watt 33 in. Portable Electric Tower Space Heater with 3D Flame 60° Oscillation

Lasko QB16103 Portable Electric 1500 Watt Room Infrared Quartz Space Heater with Remote, Adjustable Thermostat, Digital Controls, and 8 Hour Timer

Handy Heater Copper Core Pure Warmth

R.W.FLAME Space Heater, Portable Heater Electric Ceramic Fan Small Heaters Handle Indoor Use,Child Lock,Tip-Over & Overheat Protection,ECO Mode

Karl Home 1500-Watt 20.5 in. Electric Wall Mount / Freestanding Ceramic PTC Space Heater

Vornado OSCTH1 Tower Heater: Electric Indoor Space Heater, 2 Settings, Adjustable Thermostat, 100-300 sq. ft. Coverage

Infrared Heaters for Indoor Use, 20 Inch, Luxury Insulated Wooden Cabinet, Infrared Space Heater with Remote Control, Timer, Filter, Charging Ports

Gymax 1500W Oil-Filled Radiator Space Heater w/ Humidification Box Electric Portable Heater w/ 3 Heat Setting Overheat & Top-Over Protection

Karl Home 1500-Watt 17 in. Electric Tower Space Heater with 3 Heat Settings

Karl Home 1500-Watt Portable Electric Tower Space Heater with Humidifier and 3D Flame

R.W.FLAME 17" Electric Fireplace with Remote, Cathedral Design, Adjustable Flames, Brightness, Heat, and Overheat Protection

Karl Home 1500-Watt Infrared Quartz Wood Cabinet Electric Space Heater