Induction-compatible pans: how to check bases, size and performance

Induction does not heat the glass like a traditional solid plate. The hob creates a changing magnetic field that induces current in suitable cookware, and the pan itself becomes the heat source. That is why an aluminium body can work when it has a magnetic steel base, while some stainless-steel pans do not.

What makes a pan induction-compatible?

The base needs enough ferromagnetic material for the hob to detect and energise it. Cast iron and carbon steel usually satisfy that requirement. Enamelled cast iron normally works because the iron remains beneath the enamel. Aluminium, copper, glass and ceramic are not inherently magnetic, but manufacturers can add a bonded or encapsulated magnetic steel plate.

Stainless steel is not one material. Its alloy and construction determine magnetic response. Some grades are magnetic, others weakly magnetic or non-magnetic. A “stainless steel” description therefore does not prove induction compatibility. Trust the exact product page, packaging symbol and care guide—not the material name alone.

Compatibility also concerns the bottom, not the cooking surface. A non-stick aluminium pan may have a stainless induction disc; an uncoated stainless pan may use an aluminium heat-spreading core between steel layers. Our cookware materials guide separates the cooking surface from the structural and heat-spreading layers.

The magnet test: useful, but perform it properly

1. Use a small ordinary magnet. Test the outside bottom while the pan is cold and away from the hob.
2. Check centre and edge. A strong central patch with weak outer response may indicate a smaller magnetic disc than the visible pan.
3. Feel the grip. A firm hold is more promising than a magnet that barely clings, although there is no universal household force threshold.
4. Inspect the plane. Place a straight edge across the cold base and look for rocking, deep stamping or damage.
5. Verify the specification. A magnet test cannot reveal the manufacturer’s minimum zone, temperature limits or guarantee.

A positive magnet test says the hob may recognise the pan; it does not guarantee fast, even heating. A negative result on an old pan is a strong warning, but the hob manual and manufacturer listing remain the final checks. Never place loose magnets on a powered hob or near medical devices contrary to their guidance.

Induction base construction compared

Base diameter matters more than rim diameter

A frying pan advertised as 28cm is normally measured across the top rim. Its flat contact base may be much smaller. Induction hobs have a minimum detectable diameter and a recommended zone range; both belong in the appliance manual. A small milk pan may fail on a large zone even if its material is magnetic.

The reverse mismatch matters too. A broad pan on a small coil can receive most energy in the centre, leaving the outer area cooler. A hob with flexible zones can improve coverage only within its design. Trace the pan’s actual flat base onto paper and compare it with the zone specifications. Our kitchen-appliance buying guide explains why the manual and installation constraints matter more than a feature badge.

Do not judge the coil by a decorative circle alone. Some printed rings are guides rather than exact inductor boundaries. A hob may also share power between zones. The appliance running-cost guide explains why wattage, duration and control strategy all matter more than one headline power number.

Flatness, thickness and heat spreading

Induction transfers energy without needing physical contact for conduction, but a flat base still improves stability, sensor behaviour and consistent distance from the glass. A pan that rocks can make noise, spill oil to one side and heat unevenly. Slight engineered concavity when cold may flatten as the pan warms; distinguish that from a damaged or permanently bowed base using the manufacturer instructions.

A thicker, well-bonded conductive layer can spread a concentrated energy input. Thickness alone is not a ranking: a heavy cast-iron pan responds slowly, while a light aluminium-core pan changes temperature quickly. Choose response for the food. Eggs and sauces benefit from control; searing may benefit from stored heat.

Compatibility logos rarely state the magnetic disc diameter, mass or temperature uniformity. Look for a cross-section, base measurement, total weight and credible care instructions. If the retailer provides only “all hobs”, ask for the exact model documentation before buying.

Current UK induction-pan price and construction snapshot

These official IKEA UK examples were checked on 27 August 2026. They demonstrate that compatibility appears at several prices and with different surfaces; they are not performance rankings.

Price note: record the article number, exact size and selected surface. Store stock, delivery and prices can change. “Compatible with all hobs” confirms intended use, not equal heating performance across every induction model.

Why an induction pan can buzz, pulse or seem slow

A faint buzz or hum can arise as magnetic layers and pan components vibrate. Laminated cookware may sound different at high power, and a light pan can transmit more audible vibration. Hob cooling fans and power electronics add their own noise. Persistent loud rattling, error codes or unstable heating warrant checking the manual and trying another confirmed pan.

At low settings, some hobs regulate average heat by cycling energy rather than supplying a perfectly continuous trickle. A thin pan reveals those pulses more clearly; a heavier or more conductive construction smooths them. On shared-power hobs, using another zone can reduce available boost.

A pan that seems slow may have a weak or small magnetic base, be oversized for the coil, contain a large cold food load or be tested against an unrealistic boost expectation. Diagnose one variable at a time rather than replacing the hob immediately.

Booster mode: fast, but easy to misuse

Induction boost can deliver high power quickly. IKEA’s current coated-pan guidance specifically warns against rapidly heating a dry, empty pan with the booster because it can warp the pan and damage non-stick performance. Add food or liquid as directed and use medium settings for ordinary preheating unless the manufacturer says otherwise.

Thermal shock can also deform a base: do not run a hot pan under cold water. Lift cookware instead of sliding it across the glass, keep the underside dry and clean, and centre it before powering the zone. Heavy cast iron needs two-handed placement where appropriate.

Check oven limits for handles, coatings and lids separately. “Oven-safe” on one size or finish does not transfer to another. A plastic handle may make an induction pan unsuitable for the oven even though the base works perfectly on the hob.

Before buying: a seven-point induction checklist

1. Read the hob manual for minimum and recommended base diameter.
2. Confirm the exact pan listing explicitly says induction-compatible.
3. Test magnetic grip across the base when evaluating existing cookware.
4. Check cold flatness, contact diameter, total weight and handle length.
5. Choose cooking surface and maintenance for the food, not the hob logo.
6. Read booster, utensil, dishwasher and oven instructions.
7. Keep proof of purchase and test detection promptly within the return period.

Measure storage and lifting comfort as well as the zone. The small-kitchen guide helps map the full handle envelope, and our ownership-cost guide includes coating replacement, seasoning time and delivery.

Balanced verdict: what should you prioritise?

Buy an induction pan only after confirming its magnetic base and matching its actual contact diameter to the hob. Then judge the heat-spreading layer, flatness, weight, surface and care. A £9 pan can be genuinely compatible, while a premium pan can still be a poor physical match for a small zone.

Do not replace every pan automatically when moving to induction. Test existing cookware and retain the pieces that are flat, strongly magnetic and useful. For product faults and guarantee language, use our warranty and rights explainer; browse more practical coverage in Home & Kitchen.