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Why is an electric roaster oven energy efficient?

A:

Quick Answer

Electric roaster ovens are energy efficient because they are small compared to conventional ovens. A small vessel requires less time to heat, so the heating elements of a roaster oven are powered for less time than those of a conventional oven, thereby consuming less energy.

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Full Answer

An electric oven maintains a desired interior temperature by turning on and off resistive heating elements over time. Electric current flowing through the heavy gauge elements is converted to heat that radiates into the oven interior. Longer heating element on time results in higher temperatures. An electronic thermostatic controller or predefined on/off power cycles are used to achieve different oven temperatures.

A typical conventional electric oven will consume between 2,500 watts and 5,000 watts of power. With on/off heating element cycling for a temperature of 350 degree Fahrenheit, the conventional oven uses approximately 2 kilowatt hours (kWh) of energy in one hour of cooking time. A smaller 1,200 watt oven will use only about 0.9 kWh when set to 450 degrees for 50 minutes.

If the small roaster oven is opened during cooking for basting or stirring, the heat loss is more severe than for a large, front-opening conventional oven. Significant element on time is required after opening the small roaster oven, reducing overall power efficiency.

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