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What Size Breaker for a Dishwasher?

Dishwasher breakers are usually 15 A or 20 A, but hardwired units, boost heaters and shared garbage-disposal circuits change the answer.
Appliance
Dishwasher
Scope
nameplate
Deciding input
Nameplate current
Next
Compatibility calculator

What Decides the Breaker

Dishwasher branch circuits depend on the nameplate and whether the load is continuous.

InputSizing basisBreaker directionStatus
10 A example load10 A load15 A starting pointRun conductor check
What Size Breaker for a Dishwasher?. Use the nameplate and calculator for the actual installation.

What Actually Decides the BreakerStart with the nameplate current and the manufacturer circuit requirement. Most household dishwashers land on 15 A or 20 A. Shared circuits with disposals are a local-practice and instruction problem — some listings allow it, many clean installs do not.

Check breaker and wire together

Hardwired Under-Sink Surprises

The job-site situation behind this search.

A cord-and-plug dishwasher on a kitchen receptacle looks like any other 15 A load until a hardwired install, a boost heater, or a shared disposal switch loop shows up in the cabinet. The search query is simple; the cabinet wiring is not.

Units with electric boost heaters can behave more like continuous heating loads during long cycles than people expect from “just a dishwasher.”

Worked Starting Point

A concrete path for this appliance — not a shared checklist.

Worked Starting Point: 10 A Nameplate Dishwasher

Household dishwasher, nameplate 10 A, manufacturer allows a 15 A or 20 A dedicated circuit, copper conductors.

  1. Design from 10 A nameplate; continuous treatment only if the instructions or local practice require it for the boost heater.
  2. Select 15 A with 14 AWG copper or 20 A with 12 AWG copper to match the receptacle or hardwire method used.
  3. If sharing with a disposal, confirm both listings and the switch arrangement before reducing to one breaker.
  4. Run the compatibility check if aluminum or long runs enter the picture.

Starting point: dedicated 15 A or 20 A circuit for a typical 10 A dishwasher — verify before sharing with a disposal.

Field Checks for This Appliance

Checks that matter specifically here — not the generic breaker list.

  • Obey the installation circuit statement

    If the instructions require a dedicated 20 A circuit, a shared 15 A laundry leftover is not close enough.

  • Decide dedicated vs shared with disposal

    A dual-circuit or duplex-switch arrangement is a design choice that must match both listings and the AHJ's expectations.

  • Watch boost-heater current

    Sanitize or boost options raise electrical demand beyond the idle rating on the front of the door.

  • Match cord-and-plug vs hardwired instructions

    Some units prohibit cord kits or require them. That choice affects receptacle rating and whether a switch is required.

Dishwasher Breaker FAQs

Does a dishwasher need a dedicated circuit?
Often yes in practice, and sometimes yes by instruction. Even when sharing with a disposal is permitted, dedicated circuits avoid nuisance trips and inspection arguments.
Is a dishwasher a continuous load?
Not automatically. Long sanitize cycles with boost heat can justify conservative sizing, but apply continuous-load multipliers when the rules or instructions call for them — not by habit on every unit.
What breaker size for a dishwasher and garbage disposal together?
Only if both listings and the adopted code path allow a shared circuit. Many clean designs use two breakers. Do not assume one 20 A kitchen breaker covers both motors and a heater.