Assertion: hot tub's system | /r/CapableOf | keep water
Facets:
Source sentences:
text: Again, the 240v system heats the spa water faster, but this is really only a benefit when heating the tub for the first time, as both systems are able to keep water warm year-round.
text: The filtration and water sanitation systems in your hot tub keep the water sparking and clean.