How Induction Works, and What Follows From It
An induction hob generates an oscillating magnetic field that induces electrical currents directly in a ferromagnetic pan. The pan itself becomes the heating element; the hob surface stays comparatively cool and only warms by conduction from the pan. That is why induction is so fast and so efficient — there is no burner heating air heating metal.
Three consequences follow directly. The pan must be magnetic, so cast iron, carbon steel and magnetic stainless work while aluminium, copper and most non-magnetic stainless do not. Response to a control change is close to instant, unlike the thermal lag of an electric coil. And nothing is hot except the pan, so spills do not burn on and the kitchen stays noticeably cooler.
The Magnet Test
Stick a fridge magnet to the base of the pan. If it holds firmly, the pan works on induction. If it falls off or barely clings, it will not.
Note that some multi-clad stainless pans have a magnetic base plate bonded to a non-magnetic body specifically for induction compatibility, and some cheap woks with rounded bases will not make sufficient contact regardless of material.
Why Cheap Units Simmer Badly
This is the specification difference that matters most and is almost never explained. A portable induction cooktop delivering, say, 1800 watts at maximum has to produce lower power settings somehow. Better units modulate the actual power output continuously. Cheaper units simply cycle the element on and off — full power for two seconds, off for eight.
For boiling water this is irrelevant. For a delicate sauce, a custard, melting chocolate or a long gentle simmer, it is the difference between control and a series of small scorching events. This is the entire basis of the complaint that induction cannot simmer, and it is a property of cheap implementations rather than of induction itself.
Two practical signals: units with a genuine temperature control mode rather than only numbered power levels tend to modulate rather than cycle, and units with a large number of power steps — fifteen or twenty rather than eight — usually have finer control at the low end where it matters.
Who Should Buy a Portable Induction Cooktop?
The Extra Burner
- Holiday cooking when the hob is full
- Canning or stock-making without occupying the kitchen
- Deep frying outdoors or in a garage away from the house
- Precise temperature work like tempering chocolate
The Rental Kitchen Fix
- You have a poor electric coil hob you cannot replace
- You want responsive control without a renovation
- Portable, plugs into a standard outlet
- Goes with you when you move
The Small Space Cook
- Studio, dorm, boat or van kitchen
- No gas connection and limited ventilation
- Surface stays cool and does not heat the room
- Stores in a cupboard between uses
When Induction Frustrates
- Most of your cookware is aluminium or copper
- You cook with a round-bottomed wok
- You want a very low simmer from a cheap unit
- You rely on visual flame feedback for control
Top Picks with Amazon Links
1800W Portable Induction Cooktop
The standard for a household outlet, and enough power to boil a large pot faster than any gas burner in a domestic kitchen. Prioritise units with many power steps and a genuine temperature mode, since that is where control at low settings comes from.
Best for: An extra burner, a rental kitchen fix, or precise temperature work.
Induction Cooktop with Precise Temperature Mode
Units offering degree-level temperature setting rather than only numbered power levels generally modulate power continuously instead of cycling the element on and off. That is the difference between a controllable simmer and a series of small scorches.
Best for: Sauces, custards, chocolate, sous vide-style holding and anything that scorches easily.
Double-Burner Induction Cooktop
Two zones on one unit, useful for a small kitchen where it becomes the primary hob rather than a supplement. Check the combined wattage — many double units cannot run both zones at full power simultaneously on a single household circuit.
Best for: Studios, vans, boats and small kitchens without a conventional hob.
Induction Interface Disk
A magnetic steel plate that sits between the hob and a non-magnetic pan, letting you use aluminium, copper or a round-bottomed wok. It works, and it also reintroduces the thermal lag induction exists to remove, so treat it as a compromise rather than a solution.
Best for: Occasional use of an incompatible favourite pan you are not replacing.
Magnetic Stainless or Carbon Steel Pan
The single best upgrade for anyone moving to induction. A flat, magnetic-base pan with good contact makes far more difference to performance than a more expensive cooktop, and a warped base is the most common cause of uneven heating people blame on the unit.
Best for: Anyone whose current pans fail the magnet test or have warped bases.
Noise, Warnings and Practical Limits
Induction hobs make noise, and buyers are frequently surprised by this. Cooling fans run whenever the unit is working hard, and pans — particularly multi-clad ones — can hum or buzz at high power as the layers vibrate in the magnetic field. Neither indicates a fault, and a heavier single-material pan is usually quieter.
Two safety notes worth stating. Induction hobs generate electromagnetic fields, and manufacturers of cardiac implanted devices such as pacemakers and defibrillators typically advise maintaining a distance from induction hobs — anyone with an implanted device should check their device manufacturer's guidance rather than assume. And the surface does get hot from conducted pan heat even though it is not itself a heating element, so residual heat indicators exist for a reason.
Buy a 1800W unit with a genuine temperature mode and plenty of power steps. The wattage figure is nearly identical across the category because a household outlet sets the ceiling; what separates good units from cheap ones is whether low settings modulate power or simply cycle the element on and off. Test your pans with a fridge magnet first, and if the answer is disappointing, put the money into one good flat magnetic pan rather than a more expensive cooktop — it will make more difference.
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Frequently Asked Questions
What pans work on induction?
Anything ferromagnetic: cast iron, carbon steel, enamelled cast iron and magnetic stainless. Aluminium, copper and most non-magnetic stainless will not work unless they have a bonded magnetic base plate. The reliable test is a fridge magnet on the base of the pan — if it holds firmly, the pan works; if it falls off or barely clings, it will not.
Why does my induction cooktop simmer badly?
Because cheap units produce low power settings by cycling the element fully on and off rather than modulating actual output. Full power for two seconds then off for eight is fine for boiling water and produces a series of small scorching events in a delicate sauce. Units with a genuine temperature mode and many power steps generally modulate instead, which is where controllable simmering comes from.
Is induction better than gas?
For speed, efficiency and precision, yes — induction boils faster, wastes far less energy, responds instantly to control changes and keeps the kitchen cooler. Gas retains advantages for round-bottomed woks, for charring directly over flame, and for visual feedback. Gas also has indoor air quality implications that induction avoids entirely.
Can I use a wok on an induction cooktop?
A flat-bottomed carbon steel wok works well. A traditional round-bottomed wok does not, because it cannot make sufficient contact with the flat hob surface. Dedicated induction wok hobs with a concave surface exist and are expensive. An interface disk is a workaround that reintroduces exactly the thermal lag induction exists to eliminate.
Are induction cooktops safe with a pacemaker?
Manufacturers of cardiac implanted devices such as pacemakers and defibrillators typically advise maintaining a distance from induction hobs, since they generate electromagnetic fields. Anyone with an implanted cardiac device should check their specific device manufacturer's guidance rather than assume it is fine. This is general information, not medical advice.