Using a trivet or heat diffuser between a cast iron skillet and a gas burner is generally not necessary for standard cooking. Cast iron is a durable and heat-resistant material, and when properly seasoned and cared for, it can handle direct contact with most stovetops, including gas burners, without any issues.
However, there are a few scenarios where using a trivet or heat diffuser might be beneficial:
Heat control: Gas burners can provide intense, concentrated heat, and some cooktops may have hot spots. Using a heat diffuser can help distribute the heat more evenly across the bottom of the cast iron pan, preventing localized overheating and reducing the risk of hot spots.
Induction stovetops: If you have an induction stovetop and want to use a cast iron skillet, you'll need a heat diffuser since cast iron cookware is not compatible with induction cooking on its own. The diffuser acts as a bridge between the magnetic field of the induction cooktop and the non-magnetic cast iron pan.
Protecting the cooktop: Although cast iron is unlikely to damage most stovetops, using a trivet or heat diffuser can add an extra layer of protection to prevent scratches or marks on your cooktop's surface.
Specialty cooking: In some specific cooking situations, such as slow and even simmering, using a heat diffuser can help maintain a more consistent and controlled temperature.
If you decide to use a heat diffuser, look for one that is appropriate for your stove type (gas or induction) and is designed to handle the weight and size of your cast iron skillet. When using a trivet, choose one that is stable and fits well with your skillet's size.
Overall, while using a trivet or heat diffuser is optional, they can be useful in certain situations to enhance heat distribution, protect the cooktop, or adapt to induction stovetops. For regular stovetop cooking on a gas burner, you can use your cast iron skillet directly on the burner without any issues.