I think the idea is that even if you only break even after mortgage and expenses, you gain equity in the house and eventually own the house which you then have at your disposal. You can continue to rent it out without the expense of the mortgage, or sell it and cash in.
That looks like a timer, possibly from another device. "Living Room Display" makes me think it's from a display of some sort - possibly a Nest Hub? Did you maybe set a timer at some point and it misheard the length and set an absurdly long timer?
Yes, but I'd say it goes further. Using it until it evaporates isn't a side effect of some other cooling process. Evaporating the water is the cooling process.
I'd buy a printer. If you're looking for something easy, an assembled Prusa Core One. If you want something more expandable/project-like then probably a Voron.