Some major household appliances that are of 220V are dishwashers, microwave Ovens, refrigerators & freezers, washers & dryers, water heaters, water purifiers, built in ovens, cooking range & hoods too.
Nowadays you don't necessarily need any 220v appliances or units at all. Generally it is the hvac, possibly refigerator, laundry, again, it does not have to be.
