Space heating is seasonal, but hot water isn't. A water-heating system like the Aqueon stays useful through the summer, and a hot tub needs heat in every season.
How many hours it mines depends on how much heat your home uses. A steady, year-round load, like a hot tub, a pool, or a large hot water demand, keeps it running much more of the day. To mine 24/7 with no heat demand at all, add the optional outdoor dry cooler.