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Bettesworth Construction
Cookware

Induction Cooking: How Coil and Pan Characteristics Affect Heating

Induction performance depends on magnetic coupling between the cooktop coil and the pan’s base. Check the base material, diameter, flatness and fit against the specific burner.

By Bettesworth Construction Team 3 min read
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Induction heating depends on how well the cooktop’s coil couples with a pan’s magnetic base. For reliable heating, use compatible magnetic cookware with a flat bottom, center it over the marked cooking zone, and compare the base’s magnetic diameter—not the pan’s rim size—with the burner. Exact detection limits vary by cooktop, so the appliance manual is the authority.

How an induction coil heats a pan

An induction cooktop creates an electromagnetic field beneath its glass surface. When compatible cookware sits over the coil, the field induces currents in the pan and the pan heats directly. The cooktop is not heating the whole glass surface like a conventional radiant element; as the U.S. Department of Energy explains, “The heat is created from within the cookware itself; as soon as you remove it from a burner, the heating stops.” U.S. Department of Energy, May 11, 2023

Which pan characteristics affect heating?

Magnetic material

The pan’s base must respond to the cooktop’s magnetic field. A practical screening test is to see whether a magnet sticks firmly to the bottom. Cast iron, carbon steel, and magnetic stainless steel are common compatible choices; stainless steel is not automatically magnetic. Aluminum or copper without a magnetic base, glass, ceramic, and some stainless-steel pans may not work. GE Appliances describes the magnet test as a key way to check cookware compatibility: GE Appliances cookware guidance.

Magnetic base diameter

Measure the flat magnetic area on the pan’s underside, not just the diameter printed on its label or measured across the rim. A broad pan may have a much smaller magnetic disk, which can leave the cooktop sensing less cookware than the top diameter suggests.

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For best performance, match that magnetic base to the burner’s marked cooking circle and center the pan. GE says an undersized pan on a larger burner may receive less power and take longer to boil. A larger pan can extend past the circle, but the area beyond it is not directly heated by the coil. GE Appliances size-and-shape guidance

Flatness and contact

A flat bottom that sits in full contact with the glass helps the cookware remain properly positioned over the element. A warped or rounded base can compromise contact and make heating less dependable. Center the pan within the burner markings rather than placing it partly off the zone.

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Thickness and shape

GE’s guidance says thickness is usually less important than other fit factors; it notes that common ferrous cookware thicker than 0.008 inches (0.2 mm) generally works. That is manufacturer guidance, not a universal performance threshold, and cookware construction can still affect response and noise. GE also says square pans can work, while round pans sized to the coil generally work best. GE Appliances size-and-shape guidance

How to choose a pan for a particular cooktop

  1. Check the cookware material. Hold a magnet to the actual bottom. If it does not stick firmly, the pan may not be compatible.
  2. Measure the magnetic base. Identify the flat magnetic disk’s diameter; do not rely on the rim or advertised top diameter.
  3. Compare it with the cooking zone. Match the base as closely as practical to the marked burner circle, and use a closer-sized zone if the pan is much smaller than the available burner.
  4. Check fit and position. Look for a flat bottom and center the pan within the element markings.
  5. Confirm the cooktop’s minimum size. Consult the exact model’s manual and cookware guidance. GE’s support page gives a 5-inch minimum for the products covered there, but that figure is not universal; the appliance’s own instructions control. GE Appliances compatibility guidance
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Why an induction pan may heat poorly or fail to start

If a pan is magnetic but performs poorly, check the factors that determine whether the cooktop detects and couples with it:

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  • The magnetic base may be substantially smaller than the pan’s rim or the burner circle.
  • The pan may not be centered over the marked element.
  • The bottom may be warped rather than flat against the glass.
  • The pan may fall below that cooktop’s minimum cookware size.
  • The selected burner may be a poor size match when another zone is available.

If the burner flashes or will not run, check the appliance manual and the manufacturer’s troubleshooting instructions; detection behavior and minimum sizes are model-specific. GE Appliances induction burner troubleshooting

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