Induction Cooker Buying Guide: Power, Pans and Safety

This induction cooker buying guide gives you the short answer first. Pick a model with enough power for your pot, buy or test pans that a magnet sticks to, and make sure it has a child lock and an overheating cutoff. Then keep the invoice and the warranty card in one safe place.

An induction cooker is an electric hob. It heats the pan directly instead of heating a flame or a hot plate. Some models are single portable units for the counter, and others have two zones built into a worktop. The checks below work for both.

How an induction cooker works

A copper coil sits under a glass-ceramic surface. Alternating current in the coil makes a changing magnetic field. That field creates currents in the metal base of the pan, and the pan's own resistance turns those currents into heat. The cooking surface itself stays much cooler than the pan, and heat changes almost at once when you turn the dial.

There is no flame and no gas to leak. The surface can still get warm from the pan, so treat it with care after cooking.

Sources: Wikipedia, Induction cooking, https://en.wikipedia.org/wiki/Induction_cooking

Check the pans first

This is where most buyers get surprised. A standard induction cooker needs cookware with a magnetic base, such as cast iron or some stainless steels. Plain aluminium and copper pans usually will not heat. Some all-metal models can use them, but you should confirm that on the box.

Use the magnet test in the shop or at home. If a fridge magnet sticks firmly to the bottom of the pan, the pan will normally work. The base should also be flat. Heating power falls quickly as the pan lifts away from the surface, so a warped base cooks slowly and unevenly.

Look for an induction symbol on the pan base or the packaging. Do not assume that a pan you already own will work. If your old pans fail the magnet test, add the price of new ones to your budget.

Sources: Wikipedia, Induction cooking, https://en.wikipedia.org/wiki/Induction_cooking

Power and pan size

Power is shown in watts on the label and in the spec sheet. A higher number boils water faster, but it also draws more current from your home circuit. Read the rated power on the spec sheet and compare it with the socket and breaker in your kitchen. If you plan to run it with a rice cooker, a kettle or a fridge on the same line, ask an electrician to check the load.

Every cooker also has a minimum and a maximum pan size for each zone. If the pan is too small, the cooker may refuse to start. That is a normal safety behaviour, not a fault. Measure the base of your largest pot and your smallest pan, then compare them with the range in the manual.

Ask which power levels the dial offers. A model with several low settings is better for soups and sauces. A model with only a few jumps can scorch food.

Sources: Wikipedia, Induction cooking, https://en.wikipedia.org/wiki/Induction_cooking; manufacturer spec sheets for the model you are considering.

Safety features to look for

Good induction cookers detect the pan. The unit watches the power it delivers, and it switches the zone off when no pan is present or the pan is too small. A surface sensor adds a second layer. It cuts power if a pan overheats, for example when a pot boils dry.

• Child lock: blocks the controls so a child cannot switch the zone on by accident.
• Overheating cutoff: stops the heating when the pan or the unit gets too hot.
• Automatic shut-off: turns the zone off after a set time if nobody touches the controls.
• Residual heat light: warns you that the glass is still warm.

Test these in the shop if the seller allows it. Put a pan on, run the cooker, and confirm that the lock and the cutoff behave as the manual says. Keep the vents clear, because the unit has a fan that cools its electronics.

If you have a pacemaker or another implanted medical device, ask your doctor before you use an induction hob. This is general information, not medical advice.

Sources: Wikipedia, Induction cooking, https://en.wikipedia.org/wiki/Induction_cooking; manufacturer manuals.

Running costs and efficiency

Independent tests generally put induction at about 74 to 77 percent efficient, and occasionally up to 81 percent. Gas comes in at about 40 percent in the same tests. In practice this means more of the energy you pay for reaches the food, and the kitchen stays cooler. Induction is strongest at bringing water to a boil. For very long, slow simmering the gain is smaller.

Do not trust a single big efficiency claim on a box. Ask where the figure comes from and under what test.

Sources: Wikipedia, Induction cooking, https://en.wikipedia.org/wiki/Induction_cooking

Warranty and after-sales checks

Buy from a seller who gives a proper invoice. Write the model number and the serial number on the invoice, and keep it with the warranty card. Before paying, ask five simple questions:

• How long is the warranty, and does it cover the coil and the control board?
• Where is the nearest service centre?
• Is the warranty card stamped and dated by the seller?
• Is the manual available in Vietnamese?
• Are spare parts, such as the glass top, sold locally?

Photograph the card and the invoice with your phone. If the cooker fails, contact the seller or the service centre in writing and keep the reply.

A quick buying checklist

Take this list to the shop. Check the pan compatibility, the rated power, the pan size range, the child lock, the overheating cutoff, the warranty length and the service centre. If the seller cannot answer one of these, choose another model.

Sources: Wikipedia, Induction cooking, https://en.wikipedia.org/wiki/Induction_cooking