What Size Converter for a Dishwasher?
Helvis Smoteks
The short answer
For a dishwasher, a converter isn't really the answer. A dishwasher combines a pump motor, a big heating element and an electronic control board — and the motor and controls are tuned to frequency, which a transformer can't change. On the world's 50Hz, a US 60Hz dishwasher mistimes and strains. Buy a 220V/50Hz dishwasher instead. If you already own a US one and must run it, size to about 3× the heating wattage — roughly 5,000W for most models, and beyond a practical transformer for large heated-dry units, where buying native wins.
Why a dishwasher is a "buy native" appliance
People assume a dishwasher is a simple pump appliance, but the pump motor draws only 200–400W — the real electrical load is the heating element that heats the wash water and drives the heated-dry cycle, pulling 1,200–1,800W for long stretches. On top of that, the motor and the electronic controls are tuned to 60Hz. A transformer can match the voltage, but it can't fix the frequency, so cycle timing and the pump run off. For a built-in appliance you'll use daily, a native 220V/50Hz dishwasher just works.
If you already own a US dishwasher, what size converter would it need?
The heating element decides the size. Our rule for anything that makes heat is about 3× the heating wattage. A 1,500W dishwasher wants roughly a 5,000W transformer; an 1,800W heated-dry model runs past a practical transformer size — which is where buying native makes more sense.
| Dishwasher type | Peak load | Dominant load | Transformer size |
|---|---|---|---|
| Compact / slimline (18") | 1,000–1,300 W | Heater | 3,000–5,000 W |
| Standard (24") | 1,300–1,600 W | Heater | 5,000 W |
| Large w/ heated dry | 1,600–1,900 W | Heater | 5,500 W+ / buy native |
| High-temp sanitize models | 1,800–2,200 W | Heater | Buy native |
Don't size to the "eco" wattage
Many dishwashers advertise a low eco-cycle figure. A transformer has to survive the hot-wash and heated-dry peak, which is much higher — always size to the maximum on the nameplate. And remember, this is the fallback; the frequency issue still favors buying native.
The better move: buy a 220V/50Hz dishwasher
A dishwasher built for your destination runs at the right voltage and frequency — correct cycle timing, correct heating, no transformer under the counter.
Frequently asked questions
What size converter do I need for a dishwasher?
Ideally none — a dishwasher's pump motor and timing board run off frequency, which a transformer can't change, so we recommend a 220V/50Hz dishwasher. If you already own a US one, size to about 3× the heating element: roughly 5,000W for most models, and beyond a practical transformer for large heated-dry units.
Why is the heating element the deciding factor?
The pump motor draws only 200–400W, but the water and drying heater draws 1,200–1,800W. If you do convert one, the transformer must be rated for that larger heater load.
Can I use a travel converter for a dishwasher?
No. A dishwasher runs a full cycle with a continuous heating load, so it would need a continuous-duty transformer, not a travel converter. Better still, buy a 220V/50Hz dishwasher.
What about my refrigerator or washer?
Those follow different rules. See the refrigerator and washing machine converter guides.