Samsung cooktops split by heating technology in the model prefix: NZ marks induction models such as the NZ36K7570RS, and NA marks radiant electric models. Both are built-in units sold separate from a range and are commonly paired with a Samsung wall oven below.
The characters after the prefix encode the width (the “36” above is a 36-inch surface, with 30-inch versions also common), the zone count, the generation, and a finish suffix like RS. Higher induction tiers add a Virtual Flame LED cue that projects a soft glow to show heat level, a Flex Zone that links two elements into one large bridged surface for a griddle or long pan, and Wi-Fi control over SmartThings. The rating plate carrying the full model and serial number is on the underside of the cooktop body, visible from the cabinet below or once the unit is lifted out of the countertop cutout. The serial number beside it dates the build, so a technician can match the correct coil or element revision rather than guessing from the model alone.
Reading that full string before ordering parts is essential because induction and radiant cooktops share almost no internal components: an NZ repair may need an induction coil and its inverter driver, while an NA repair needs a radiant element, and both use different touch-control boards that Samsung has revised across generations. On induction models in particular, the inverter board was updated more than once, which is exactly why the serial matters as much as the model prefix. The prefix alone will not plan the job, so record the complete model and serial before you book cooktop repair for a clear, upfront quote.