Induction Cooktops and Ranges: A Buyer's Guide

If you have already decided that induction is the right fuel for your kitchen, this page is about choosing a good one. If you are still weighing it against gas, start with the comparison of gas, electric and induction ranges, which also covers where Washington's gas rules stand. Here the subject is how induction behaves, what it asks of the house, and what separates one model from another.

How induction works

Under each cooking zone is a coil. When the zone is on, the coil produces a magnetic field that induces electric currents in the base of the pan, and the pan's own resistance turns those currents into heat. The U.S. Department of Energy puts it this way: the heat is created from within the cookware itself, and when you remove the pan from the burner, the heating stops.

Three practical results follow:

• Fast response. Power changes reach the food almost at once, in both directions. A pot at a rolling boil settles to a simmer when you turn it down.
• A cooler surface. The glass is heated only by the hot pan sitting on it. It still gets hot enough to burn, and models show a residual heat indicator, but it does not reach the temperature of a radiant element.
• Less wasted heat. ENERGY STAR describes induction as transferring energy at approximately 85% efficiency, against approximately 32% for gas and 75% to 80% for electric resistance. The Department of Energy summarizes that as up to three times more efficient than gas and up to 10% more efficient than a conventional smooth-top electric range. In daily life you notice it as a kitchen that stays cooler.

Cookware

The Department of Energy's rule is the one to remember: any pot or pan with a flat bottom that a magnet sticks to will work.

Flatness matters as much as magnetism. A pan with a warped base makes poor contact with the field, heats unevenly and can rattle. The pan should also be close to the size of the zone. Most cooktops will not turn on a zone if the pan is far too small for it.

Power and wiring

An induction range or cooktop needs a dedicated circuit, and the size comes from the nameplate of the model you buy. This guide does not quote circuit sizes. What you need to know at planning stage:

• Replacing an electric range with an induction range is often the simplest case, but the existing circuit and receptacle still have to match what the new model requires. Have your electrician check before you order.
• Replacing a gas range means a new circuit from the panel, and the panel must have the capacity and a space for it.
• A cooktop over a separate wall oven usually means two circuits.
• Total connected power varies by model. Two cooktops of the same width can have different electrical requirements. Compare the installation sheets, not the marketing pages.

A new or altered range circuit needs an electrical permit. The kitchen electrical code page explains the rules that apply, and the electrical permit page explains who issues the permit at your address.

Zone layouts, bridging and power sharing

This is where models differ most, and where a showroom visit pays off.

• Fixed round zones. Each zone has a set diameter. Check that the large zone is in a position you will reach comfortably and that the sizes suit the pans you own.
• Bridge zones. Two zones that link and run as one for a griddle or a fish pan.
• Flexible or full-surface zones. Many small coils that detect a pan wherever it is placed. The most adaptable layout and the highest cost tier.
• Power sharing. Many cooktops pair zones on a shared power supply. When one zone of a pair is on its boost setting, the other is limited. If you often run several pans on high together, ask how the zones are grouped.
• Boost. A short burst above the normal maximum for bringing water to a boil. Useful, and usually timed.

Controls

Controls are touch sliders, touch buttons or physical knobs. Touch panels wipe clean but can be awkward with wet fingers, and some pause the cooktop when a spill reaches them. Knobs give quick, eyes-free adjustment and appear mostly on ranges. Try both with a pan on the surface before you decide. Also check the number of power steps. Fine steps at the low end are what make holding a sauce or melting chocolate easy.

Noise

Induction is quiet but not silent. Expect a soft fan from the electronics during and after cooking, a faint hum or buzz from some pans at high power, and a clicking sound at low settings on models that pulse the power on and off. Heavy, flat, one-piece pans are the quietest. Light multi-ply pans and loose lids are the noisiest. None of this is a defect, but it varies by model, so listen to a working display unit if you can.

You still need a hood

Induction removes the combustion gases of a gas flame. It does not remove steam, grease or the smoke from searing. A hood is still part of the plan, and Washington sets a minimum for it, lower than the minimum over gas. The numbers are on the range hoods and ventilation page, and the styles are compared under range hood types.

What to check on the spec sheet

• Cutout dimensions and the required clear depth below a cooktop, including any barrier above a drawer.
• Electrical requirements and the location of the junction box or receptacle.
• Number of zones, each zone's diameter and maximum power, and how zones share power.
• Whether there is a bridge or flexible zone, and its usable length.
• Number of power levels and whether there is a dedicated low or keep-warm setting.
• Minimum pan size each zone will detect.
• Control type, child lock and automatic shutoff behavior.
• On a range: oven capacity, convection type and whether the oven has a self-clean cycle.
• Whether the edge is framed, beveled or flush-mounted, since a flush mount changes the countertop fabrication.

Who should choose induction, and which kind

• A 30 inch induction range suits most households replacing an electric range in the same opening.
• A 36 inch cooktop with a bridge zone suits cooks who use a griddle or several large pans, paired with a wall oven. See range versus cooktop and wall oven.
• A full-surface model suits people who cook with odd-sized pans and are comfortable with a touch interface.
• Stay with gas or radiant electric if you rely on a round-bottom wok over flame, if most of your cookware would need replacing and that matters to you, or if the panel cannot support the circuit without work you do not want to fund.

On incentives: Washington's state electrification program lists induction cooking equipment, but help is limited and conditional. Read the rebates and tax credits page before you buy, because approval has to come first where a program applies.

At JDI Construction our team checks the panel and the circuit route during design, so the induction decision is made with the electrical cost on the table. If you would like that looked at for your home, contact us for a free in-home consultation.