Preheating is very important when baking, especially items with short cooking times, such as cakes, cookies, biscuits and other pastries. Although preheating is not needed for meats, poultry, casseroles, when roasting or when cooking complete meals, it is recommended.
Haier gas ranges automatically start to preheat when turned on; however, they do not have a Preheat indicator light or signal to alert you when preheating is finished. To ensure your range is preheated, wait approximately 10-20 minutes to allow the oven to preheat.