Assertion: boiler's furnace | /r/CapableOf | use natural gas
Facets:
value: as the power source
type: MANNER
Source sentences:
text: Furnaces use electricity, natural gas, heating oil, and propane.
text: Furnaces use electricity, natural gas, heating oil, and propane.
text: Furnaces can operate using propane, natural gas or electricity as the power source.