steam heating

noun
a heating system utilizing steam circulated through radiators and pipes.

Origin:
1875–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Another complication was that we'd have had to replace our steam heating with
  forced air.
Steam heating is the hydronic heating system that uses steam to carry the heat
  from the furnace into the rest of the house.
These boilers are used for steam heating, hot water heating, and hot water
  supply.
Securing and opening the steam heating boiler found the boiler full of calcium
  hardness and scale.
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