Below are possible answers for the crossword clue Giant heater.
3 letter answer(s) to giant heater
SUN
a person considered as a source of warmth or energy or glory etc
any star around which a planetary system revolves
expose one's body to the sun
expose to the rays of the sun or affect by exposure to the sun; "insolated paper may turn yellow and crumble"; "These herbs suffer when sunned"
first day of the week; observed as a day of rest and worship by most Christians
the rays of the sun; "the shingles were weathered by the sun and wind"
the star that is the source of light and heat for the planets in the solar system; "the sun contains 99.85% of the mass in the solar system"; "the Earth revolves around the Sun"
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