Most Efficient Electric Baseboard Heaters

electric baseboard
An individual space heater with electric resistance coils mounted behind shallow panels along baseboards. Electric baseboards rely on passive convection to distribute heated air to the space.
An electric heat-emitting appliance located at ground (or ceiling) level. This appliance may be made of cast iron or flanges.

efficient
(esp. of a system or machine) Achieving maximum productivity with minimum wasted effort or expense
(of a person) Working in a well-organized and competent way
being effective without wasting time or effort or expense; "an efficient production manager"; "efficient engines save gas"
effective: able to accomplish a purpose; functioning effectively; "people who will do nothing unless they get something out of it for themselves are often highly effective persons"-G.B.Shaw; "effective personnel"; "an efficient secretary"; "the efficient cause of the revolution"
(efficiently) with efficiency; in an efficient manner; "he functions efficiently"
Preventing the wasteful use of a particular resource

heaters
A heater is object that emits heat or causes another body to achieve a higher temperature. In a household or domestic setting, heaters are usually appliances whose purpose is to generate heating (i.e. warmth). Heaters exists for all states of matter, including solids, liquids and gases.
A conductor used for indirect heating of the cathode of a thermionic tube
(heater) device that heats water or supplies warmth to a room
A fastball
A person or thing that heats, in particular a device for warming the air or water
(heater) fastball: (baseball) a pitch thrown with maximum velocity; "he swung late on the fastball"; "he showed batters nothing but smoke"