most efficient space heater

EAGLE PEAK 1500W Outdoor Heater with Thermostat, IPX 4 Splash-proof, Overheat Protection, Radiant Heating

80,000 BTU Forced Air Diesel Heater & Kerosene Heater, Torpedo Space Heater with Thermostat Temperature Control, Portable for Outside, Jobsite

Frigidaire Ceramic Space Heater

Kismile Electric Fireplace, Realistic Flame Effects Fireplace Heater Stove, Adjustable Brightness and Heating Mode, Overheating Safe Design

Kismile Electric Fireplace, Realistic Flame Effects Fireplace Heater Stove, Adjustable Brightness and Heating Mode, Overheating Safe Design

R.W.FLAME Electric Fireplace Heater, Infrared Fireplace Heater 1000/1500W, 3D Realistic Flames Effect, ETL Certificated, Adjustable Flame Brightness

1500W Portable Ceramic Space Heater with Adjustable Thermostat, Tip-Over & Overheat Protection, Quiet Indoor Use, Small Room/Office Heater.

Brentwood 350 Watt Plug-In Wall Outlet Personal Space Heater in White

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

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

Keystone 12000 BTU Window AC 115V Inverter Heat Cool

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

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

Vornado VHEAT Heater

VOLTORB Freestanding Portable Electric Space Heater for Bedroom or Indoor Use with LED Display, Remote Control, and Fan Only Mode (3 Pack)

LifeSmart LifePro 1500 Watt Portable Electric Infrared Quartz Space Heater for Indoor w/6 Heating Elements, Wheels & Remote, Brown Oak Wood (4 Pack)

DREO 1500W PTC 10'' Space Heater Atom 416 Silver

Brentwood 600 Watt Portable Space Heater in Black

R.W.FLAME 3.5 Cu. Ft. Chest Freezer with 2 Removable Baskets, Defrost Drain, Adjustable Temperature, Energy Efficient, Top Opening Compact Freezer

Vornado Velocity 5R Space Heater: Indoor Electric Fan Heater, Programmable Timer, Remote Control, 1500W, ETL Listed

Brentwood 1000 Watt Portable Space Heater in White

Brentwood 350-Watt Plug-in Wall-Outlet Personal Space Heater in White

Dayton Portable Elct Heater,Blk,6-3/4" H 3VU37

R.W.FLAME Electric Fireplace Heater, Infrared Fireplace Heater 1000/1500W, 3D Realistic Flames Effect, ETL Certificated, Adjustable Flame Brightness