One of the easiest mistakes to make is placing a hot object onto a cool section of the cooktop.
This can include:
- A hot pan
- A hot saucepan lid
- A Dutch oven
- A baking dish
- A kettle
- A cast-iron skillet
- A hot roasting pan
- A griddle
- A heat-retaining trivet or cookware accessory
The problem isn’t simply that the object is hot.
It’s the combination of heat, contact, weight, and temperature difference.
Why a Hot Lid Can Be a Problem
Here’s a scenario many home cooks will recognize.
You’re cooking something on the stove. You lift the lid because dinner is almost ready, and instead of putting the lid on a counter or heat-safe surface, you flip it over and place it on the glass cooktop.
The lid may still be extremely hot.
If it concentrates heat into a relatively small area, that section of the glass can become much hotter than the surrounding surface.
That’s unnecessary thermal stress—and there’s simply no reason to take the chance.
Never Assume the Glass Is Too Tough to Break
This is probably the biggest misconception about glass-top stoves.
They’re made to handle everyday cooking, so it’s tempting to assume they’re basically bulletproof.
They’re not.
A glass cooktop can withstand normal cooking temperatures, but impact damage is another story entirely.
Dropping a heavy pan onto the surface can chip or crack it. Sliding rough cookware across it can cause scratches. A damaged surface may then be more vulnerable to further stress.
And once glass-ceramic develops a significant crack, continuing to cook on it can be dangerous.
The Cast-Iron Skillet Problem
Cast iron deserves special attention.
A cast-iron skillet is heavy, retains heat extremely well, and often has a rougher underside than cookware specifically designed for smooth cooktops.
That doesn’t automatically mean you can never use cast iron on a glass cooktop. Many manufacturers provide specific guidance for doing so.
But you need to be careful.
Never drop or bang cast iron onto the surface.
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