How far from the water intakes and drain do the receptacles for a stackable washer/dryer have to be and does code require a GFI?
The 2017 NEC does not specify minimum separation. In a dwelling unit 125v receptacles in laundry areas require GFCI protection. In other than dwelling units laundry areas are not specified, but within 6' of a sink 150v to ground or less single phase receptacles 50A or less and 3 phase receptacles 100A or less also requires GFCI protection. (Each leg of a 240v circuit is less than 150v to ground.)