Electric ovens with hidden cooking elements and gas ovens can take 15-20 minutes to preheat. Electric ovens with a hidden oven and the fast preheating function can take 7-10 minutes. Ovens with a visible lower cooking element can take 5-10 minutes to preheat.

To test the oven Hang a thermometer in the center of the central grid and pre-heat the oven to 350F (176,67C). Leave the pre-heating oven at least 20 minutes and read the temperature. This will tell you if the oven reaches the desired temperature from the beginning.

Place the thermometer on the left and right sides of the oven, as well as on the front and rear of the oven to see if it has any hot or cold spots. Let the thermometer stand at each place for 10 minutes before moving it to check if it changes temperature, and use oven gloves when moving the thermometer.

A recipe that recommends 10 minutes of cooking time should only be increased in about 1 minute. Compare this to a similar conversion to a 700-watt microwave. A recipe of 5 minutes would take 2 12 minutes more than the cooking time, and a recipe of 10 minutes would take about 5 12 minutes more.

Electric ovens with hidden cooking elements and gas ovens may take 15-20 minutes for preheating. Electric ovens with hidden ovens and the fast preheating function may take 7-10 minutes. Ovens with a visible lower cooking element may take 5-10 minutes for preheating.