heater

n. heating agent, device which produces heat

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Noun
1. device that heats water or supplies warmth to a room
(synonym) warmer
(hypernym) device
(hyponym) brazier, brasier
(derivation) heat
2. (baseball) a pitch thrown with maximum velocity; "he swung late on the fastball"; "he showed batters nothing but smoke"
(synonym) fastball, smoke, hummer, bullet
(hypernym) pitch, delivery
(hyponym) slider
(classification) baseball, baseball game, ball

n. ohřívač

Rzecz. grzejnik

(n.)
One who, or that which, heats.
  

(n.)
Any contrivance or implement, as a furnace, stove, or other heated body or vessel, etc., used to impart heat to something, or to contain something to be heated.