Most economical portable heater - Immersion heater controllers - Solar water heater flat panel

Most Economical Portable Heater

economical
avoiding waste; "an economical meal"; "an economical shopper"; "a frugal farmer"; "a frugal lunch"; "a sparing father and a spending son"; "sparing in their use of heat and light"; "stinting in bestowing gifts"; "thrifty because they remember the great Depression"; "`scotch' is used only informally"
(of a person or lifestyle) Careful not to waste money or resources
economic: using the minimum of time or resources necessary for effectiveness; "an economic use of home heating oil"; "a modern economical heating system"; "an economical use of her time"
Giving good value or service in relation to the amount of money, time, or effort spent
Careful with money so as not to spend too much; prudent; thrifty; Relating to economy in any other sense
Using no more of something than is necessary

portable
easily or conveniently transported; "a portable television set"
A small transportable building used as a classroom
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"

heater
A fastball
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
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
fastball: (baseball) a pitch thrown with maximum velocity; "he swung late on the fastball"; "he showed batters nothing but smoke"

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