any of various apparatus for heating, especially for heating water or the air in a room.
Electronics. the element of a vacuum tube that carries the current for heating a cathode.
Slang. a pistol, revolver, or other firearm.

1490–1500; heat + -er1

reheater, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
heater (ˈhiːtə)
1.  any device for supplying heat, such as a hot-air blower, radiator, convector, etc
2.  slang (US) a pistol
3.  electronics a conductor carrying a current that indirectly heats the cathode in some types of valve

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Turn your hot water heater down to where showering with only the hot tap open
  is comfortable.
And that you should bolt your house to its foundation and lash the water heater
  to the wall.
When it's time to replace your water heater, consider installing a solar
Cardboard wine cartons were messily piled in one corner, behind the pool heater.
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