Compare Portable Heaters

portable
A small transportable building used as a classroom
easily or conveniently transported; "a portable television set"
A version of something, such as a small lightweight television or computer, that can be easily carried
a small light typewriter; usually with a case in which it can be carried
of a motor designed to be attached to the outside of a boat's hull; "a portable outboard motor"

compare
Estimate, measure, or note the similarity or dissimilarity between
Draw an analogy between one thing and (another) for the purposes of explanation or clarification
examine and note the similarities or differences of; "John compared his haircut to his friend's"; "We compared notes after we had both seen the movie"
Point out the resemblances to; liken to
comparison: qualities that are comparable; "no comparison between the two books"; "beyond compare"
be comparable; "This car does not compare with our line of Mercedes"

heaters
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 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"
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 fastball