Only 1 in 3 steam ovens can plug into a standard outlet.

Finding 1: Most steam ovens are not plug-and-go.

Of the 69 models we could classify, only 15 (22%) run on an ordinary 120V household outlet. The other 54 need either a dedicated 208/240V circuit or a fixed hardwired connection. If you're picturing a steam oven as a countertop gadget you unbox and plug in, that's true for about a third of the market — and false for the rest.

Finding 2: Form factor decides it — almost without exception.

The split is nearly binary. Every built-in in the data (45 of 45) needs a dedicated circuit or hardwiring — not one plugs into a standard outlet. Countertop models are the mirror image: 14 of 15 just plug in. The lone countertop exception is the Panasonic HomeCHEF 7-in-1 Multi-Oven, which draws enough current to want its own circuit. So the "do I need an electrician?" question is really answered the moment you choose built-in vs countertop.

Finding 3: 36 can't be plugged in at all.

Beyond needing the right circuit, 36 models are hardwired — a fixed conduit run to a junction box, with no plug. Even if the correct circuit already exists where the oven goes, you still need a licensed electrician to make the connection. On voltage: 16 run on standard 120V, while 47 need 208V or 240V. Budget for the electrician before you fall for the finish.

How we compiled this

Each figure — voltage, plug type, connection, dedicated-circuit requirement, breaker size and wattage — is taken from the model's own manufacturer manual or specification sheet and cited on that oven's page. We classified 44 of 74 models; where a manufacturer doesn't publish a value we leave it blank and mark the model "not verified" rather than guess.