Attached things generally stay, loose things generally go — and everything genuinely important is decided by what is written in the contract, not by what you assumed.
The rough rule is physical: if it is fastened to the property it ordinarily goes with it, and if it merely sits there it ordinarily does not. Alberta's residential purchase contract handles this by distinguishing attached goods from unattached goods, and by giving both sides room to list exceptions.
Both sides get to override the default, in both directions: a seller can exclude the dining room chandelier that came from their grandmother, and a buyer can include the hot tub. What neither side gets is the benefit of the doubt later. Ambiguity is always resolved at the worst possible moment — the day the truck arrives.
Nobody has ever regretted listing the appliances. Plenty of buyers have regretted assuming them.
Attached goods are ordinarily to come to you free of any encumbrance — but the seller cannot give you something they do not own. Rented hot water tanks, leased furnaces and air conditioners, solar leases, security monitoring contracts and water softener rentals all come with a contract attached to them, and sometimes a buyout.
Ask what is rented before you write the offer, not after. Then confirm it again on your final walkthrough, when you can still do something about it.