gas furnace

noun
1.
a furnace using gas as a fuel.
2.
a furnace for distilling gas from a solid fuel, as coal.

Origin:
1870–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The new electric unit is much more efficient than my current gas furnace.
Even in the coldest weather, while electric heat pumps may fail to adequately
  deliver heat, you can rely on a natural gas furnace.
If there is any question whether flood water has reached a gas furnace or
  boiler, it should be checked by a qualified contractor.
We've all seen the blue flame on top of a gas stove or beneath a gas furnace.
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