How Many Amps Does a Dishwasher Use? The Peak, the Cycle, and the Circuit
By Seamless Home Team, Home services operations · September 29, 2026
Quick answer
Most residential built-in dishwashers are rated somewhere around 1,200 to 1,500 watts, which is roughly 10 to 12.5 amps at 120 volts. That peak happens while the heating element is on — heating wash water or drying — and the rest of the cycle is a pump and controls drawing a few amps at most. Your model's figure is on the rating label, usually on the edge of the door or the tub, and in the installation instructions, which also state the circuit it needs: commonly a 120 V individual branch circuit protected at 15 or 20 amps. The electrical code adds GFCI protection for the dishwasher outlet and keeps the dishwasher off the kitchen countertop circuits. Turning off heated dry cuts the energy per cycle, not the peak.
Ask how many amps a dishwasher uses and the honest answer is "it depends on the minute." For most of a cycle a dishwasher is a small motor pushing water through spray arms. Then the heating element comes on, and the current jumps to several times that. The number that matters for the wiring is the jump.
Where the current goes in a cycle
A typical built-in dishwasher has two electrical loads that matter:
| Phase | What is running | Rough draw at 120 V |
|---|---|---|
| Fill, wash, rinse without heat | Circulation pump, drain pump, controls | a few amps at most |
| Heating wash water | Heating element plus the pump | around 10–12.5 A |
| Heated dry | Heating element (or a fan) | close to the element's draw |
That is why the rating label and the installation instructions state a maximum: the circuit has to carry the heating phase, even though the average across a cycle is much lower. Most built-in models are rated somewhere around 1,200 to 1,500 W, which the watts to amps calculator turns into 10 to 12.5 A at 120 V. Compact and drawer models are usually lower.
Where to find your model's number
- The rating label. Usually on the edge of the door, the side of the tub, or the frame behind the kick panel. It states volts, hertz and amps (or watts).
- The installation instructions. These give the maximum draw and the circuit the manufacturer requires. GE's published guidance, for example, calls for a 120 V individual branch circuit protected by a 15 or 20 A breaker or time-delay fuse — a pattern most brands follow.
If the label and the instructions disagree with something you read online, the label and the instructions win.
What the circuit behind it has to be
Several rules converge on the same answer, which is why a dishwasher on its own circuit is the ordinary installation:
- The instructions govern. Equipment has to be installed according to its listing and instructions. When the manual says "individual circuit," that is the requirement.
- Not on the countertop circuits. The two or more 20 A small-appliance circuits that serve the kitchen countertop receptacles are reserved for those receptacles under NEC 210.52(B)(2). A dishwasher does not go on them.
- The 50 percent rule. Where fastened-in-place equipment shares a circuit with lights or receptacles, NEC 210.23(A)(2) limits it to half the circuit's rating — 10 A on a 20 A circuit. A dishwasher at 10 A or more is already at or past that line. The 20 amp circuit guide walks through both of the percentage limits.
- GFCI protection. NEC 210.8(D) requires GFCI protection for the outlet supplying a dwelling-unit dishwasher, plugged in or hardwired. Kitchen circuits also generally need AFCI protection.
A dishwasher and a garbage disposal sharing one circuit is a common arrangement when both manuals allow it and the combined load fits. If the dishwasher's manual calls for an individual circuit, it does not.
Plugged in or hardwired
Both are allowed. A cord-and-plug dishwasher needs a cord between 3 and 6.5 feet long and a receptacle in the space next to the dishwasher (commonly the sink base) where it is accessible, under NEC 422.16(B)(2). A hardwired dishwasher connects in a junction box behind the kick panel and needs a disconnecting means — often a breaker that can be locked off, or a switch within sight. Many replacements go in as cord-and-plug for exactly this reason: unplugging it is the disconnect.
The water side of the same installation — the drain connection and whether an air gap is required — is covered in does a dishwasher need an air gap.
Energy per cycle is a different question
The amps set the circuit. The energy sets the bill and the battery. Because the heater is on for only part of the cycle, a dishwasher's energy per load is far below "1,500 W times the cycle length." Your model's EnergyGuide label states its annual electricity use and the usage it assumes; divide the two to get a per-cycle figure. The watts to kWh calculator handles the arithmetic when you know a wattage and a time.
The easy savings are the heating options: heated dry off, no high-temperature or sanitize boost. They shorten or remove the element's time on, which cuts energy per cycle. They do not change the peak, because the wash water still gets heated.
On backup power
During an outage, a dishwasher is a reasonable load for a whole-home battery whose inverter can supply its 1,200 to 1,500 W peak — and running it with heated dry off keeps the battery cost of a load modest. If you are deciding what a home battery should keep running, include the dishwasher at its label peak and talk to Seamless Home about building the load list from your actual appliances.
A dishwasher is a well-behaved appliance with one inconvenient minute. Wire for the minute, and the rest of the cycle takes care of itself.
Frequently asked questions
How many amps does a dishwasher use?
Typically around 10 to 12.5 amps at 120 volts at its peak, which is when the heating element is on. Outside the heating phases a dishwasher is mostly a circulation pump and controls, drawing a few amps at most. Your model's rating label gives the maximum it is designed around.
How many watts does a dishwasher use?
Most built-in residential dishwashers are rated roughly 1,200 to 1,500 watts. Compact and drawer models are often lower. The wattage on the label is the peak; the average over a whole cycle is much less because the heater is not on the entire time.
Does a dishwasher need its own circuit?
Usually, yes in practice. Manufacturers' installation instructions commonly call for a 120 V individual branch circuit protected at 15 or 20 amps, and the code requires equipment to be installed according to its instructions. Even where a shared circuit is allowed, NEC 210.23(A)(2) caps fastened-in-place equipment at half the circuit's rating when lights or receptacles share it, which a 10 A dishwasher on a 20 A circuit already reaches.
What size breaker does a dishwasher need?
Whatever the installation instructions state — commonly 15 or 20 amps. The breaker protects the wire, so it has to match the circuit's conductors as well as the appliance. A 20 A breaker needs conductors rated for 20 A; do not up-size a breaker to stop nuisance trips.
Does a dishwasher need GFCI protection?
Yes under current editions of the National Electrical Code: NEC 210.8(D) requires GFCI protection for outlets that supply dishwashers in dwelling units, whether the dishwasher is plugged in or hardwired. Kitchen circuits also generally require AFCI protection. Your local code edition governs.
Can a dishwasher share a circuit with a garbage disposal?
It is a common arrangement when both appliances' instructions allow it and their combined load fits the circuit. Check both installation manuals first; many dishwasher instructions call for an individual circuit, and that requirement controls.
Can a dishwasher run on a home battery?
Usually, if the inverter can supply its 1,200 to 1,500 W peak continuously. Turning off heated dry and high-temperature wash options cuts the energy a cycle takes from the battery, which matters more than the peak during a long outage.