How much power kitchen appliances draw, and what your breaker actually allows

A standard North American kitchen circuit is rated for 15 amps at 120 volts. Multiply those together and the ceiling is 1,800 watts, which is the largest continuous draw the wire and the breaker are built to carry at all. Manufacturers design induction hobs, countertop ovens and portable burners to sit right at that number because it is the most power they can offer without requiring a heavier 20 amp circuit or a dedicated line, which most kitchens do not have spare.

• A single portable induction cooktop and its stainless bodied sibling are both rated at 1,800 watts
• A single degree induction hob built for holding a precise temperature is also rated at 1,800 watts
• Large countertop ovens with a convection element, such as a full size Element iQ oven, run close to the same ceiling on their highest setting

The National Electrical Code adds a second number on top of the 1,800 watt maximum: a continuous load, defined as anything running for three hours or more, should not exceed about 80 percent of a breaker's rating. Eighty percent of 15 amps is 12 amps, which works out to 1,440 watts. That is the comfortable ceiling for a long cook, not the 1,800 watt figure printed on the appliance itself.

No, and this is the detail that surprises people the first time they try to sear on one side of a double induction cooktop while simmering on the other. The unit is rated at 1,800 watts total, not 1,800 watts per burner, so the two zones share one power budget rather than each getting a full allotment. Push both zones toward a high setting at the same time and each one receives roughly half the wattage it would get running alone, which is why two pans on a double hob heat up more slowly together than either one does by itself.

This is not a defect. It is the same 15 amp, 1,800 watt ceiling from a single circuit, split between two heating elements instead of delivered to one. A single zone induction hob and a double zone hob plugged into the same wall outlet draw the same maximum current; the double unit just has to divide it.

Because their wattages add together on the same wire. A kitchen circuit does not know or care how many outlets an appliance is plugged into, only how much current is flowing through the breaker that protects the whole circuit. An 1,800 watt induction hob already sits at the edge of what a 15 amp circuit can carry by itself. Plug a blender, a toaster, or a second hot appliance into another outlet on that same circuit and the combined draw climbs past the 15 amp rating almost immediately, and the breaker trips to protect the wiring from overheating.

This is the single most common wiring complaint in a kitchen that has grown a countertop full of appliances over several purchases: two of them working at once, on outlets that turn out to share one breaker, is enough to trip it even though neither appliance is faulty. The fix is usually to move one appliance to an outlet on a different circuit, not to replace anything.

This is a cost question rather than a breaker question, because none of these appliances come close to 1,800 watts. A circulator holding a bath overnight or a dehydrator running most of a day draws modestly at any given moment, but it does so for a long time, and the arithmetic for electricity cost cares about both numbers together, not just the wattage on the label.

The formula is straightforward: kilowatt hours equal watts multiplied by hours, divided by 1,000. Cost equals kilowatt hours multiplied by the price your utility charges per kilowatt hour. Take a 600 watt food dehydrator running for 20 hours to finish a batch of jerky: 600 times 20 divided by 1,000 is 12 kilowatt hours. At 30 cents per kilowatt hour, a high but real rate in several states, that cook costs about $3.60, which is a meaningful fraction of the cost of the meat itself in a small batch.

A circulator tells a similar story from the other direction. A circulator rated at 1,100 watts does not draw that continuously once the bath is up to temperature: the element only cycles on to replace heat lost through the container walls, so the average draw across a 24 hour hold is commonly a small fraction of the rated maximum, often somewhere in the range of 100 to 150 watts. At 125 watts average for 24 hours, that is 3 kilowatt hours, or roughly 90 cents at 30 cents per kilowatt hour, for an entire overnight cook.

Only on a heavy duty cord rated for the load, and never on the light, thin cords sold for lamps or small electronics. Extension cords carry an amperage rating printed on the packaging or molded into the plug, and a cord built for a low draw device will heat up, soften, and become a fire hazard under a 1,800 watt appliance long before the breaker ever notices a problem. A cord that must be used should be a short, heavy gauge one rated for at least 15 amps, run fully uncoiled, since a coiled cord traps heat.

A breaker that trips once with two appliances running is expected behavior, and the fix is usually to separate the appliances onto different circuits. A breaker that trips repeatedly with a single appliance, or that trips with nothing unusual plugged in at all, is a different situation entirely: that is a question for a qualified electrician, not something to work around with a heavier cord or a different outlet.