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In this regard, are all dishwashers hardwired?
Dishwashers can be either hardwired, or cord-and-plug connected. Because of this, a receptacle installed in a location that requires the removal of the dishwasher is not code compliant. i.e. If you can't find where the dishwasher is plugged in, it's likely hardwired.
Then, what appliances require 220v?
Most kitchen appliances require a 220V power line, mainly because they are heavy duty appliances and require enough electrical power in order to run. This includes your cooking appliances, namely the electric stove and the microwave oven.
You may need to install a 240 volt outlet if you purchase one of the following items:
- Ovens, ranges, and cooktops.
- Clothes dryers.
- Water heaters.
- Furnaces.
- Air conditioners.
- Garage power tools.
- And more recently, electric cars.