Assertion: boiler | /r/HasProperty | a heat exchanger
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: At the centre of the system, a boiler burns a fuel - or sometimes there is a 'heat exchanger' and this heats the water that feeds the network of pipes. '
text: Simply put, a boiler can be called a heat exchanger to change the molecular structure of a liquid from a liquid to a gas.