Assertion: heat pump's system | /r/CapableOf | use boiler
Facets:
value: essentially
type: MANNER
value: as a backup heat source
type: PURPOSE
Source sentences:
text: This system essentially uses the furnace or boiler as a backup heat source when it’s too cold for the heat pump to run efficiently.
text: Thus, selecting a heat pump for space heating often displaces the need for a separate cooling system, as would be required for hydronic systems using boilers.