It is not safe to put cold water into a preheated oven or microwave, especially when using Teflon or any other type of non-stick coating. This practice can lead to rapid temperature changes, which can cause thermal shock and damage to the oven or microwave and potentially create safety hazards.
Here's why it's unsafe:
Thermal shock: When you introduce cold water into a preheated oven or microwave, it can cause sudden and extreme temperature changes. This can stress the heating elements, the oven walls, or the microwave's interior, potentially leading to cracks or even breakage.
Steam and splattering: When cold water comes into contact with a hot surface, it can create steam rapidly. In an oven or microwave, this steam can cause hot splatters, which may result in burns or scalding.
Non-stick coating concerns: For Teflon or other non-stick coatings, subjecting them to rapid temperature changes can lead to the release of harmful fumes and particles. Overheating non-stick coatings can release toxic chemicals, including perfluorooctanoic acid (PFOA), which should be avoided.
To ensure the safe use of your oven or microwave, follow these guidelines:
Preheat properly: Always allow the oven or microwave to preheat fully to the desired cooking temperature before placing food inside.
Use room temperature or appropriately heated liquids: When using the oven or microwave, make sure to use liquids at room temperature or liquids that have been heated gradually.
Avoid placing cold or frozen dishes into a preheated oven: Do not place dishes straight from the refrigerator or freezer into a preheated oven, as this can cause similar issues with thermal shock.
Care for non-stick coatings: Follow the manufacturer's guidelines for caring for and using non-stick coatings. Avoid overheating or using metal utensils on non-stick surfaces.
By following these precautions, you can safely use your oven or microwave and maintain the longevity of the appliances. Always prioritize safety when handling hot surfaces and equipment in the kitchen.