Whole house if put on mains, individual up to two circuits if set up that way. I have one on my Hot tub, one on my main and one on my solar. When they go on sale for a low price like this, they are hard to beat for monitoring. A whole home system with branch circuits can run $500 or more.
Due to a fresh Tattoo mine is turned down so last month unused $30. Usually 60-90 in the winter easily a month. Broke my neck so it gives relief but DAM. LOL
Yup that’s about what mine costs too. I started draining it in Nov. I have tankless water heater, so if I really want to use it, only takes a little over an hour to refill it with hot water.