Q&A: What's the magnet test for grills?

We're buying a new gas grill and want a stainless-steel model. A neighbor told me about a "magnet test" recommended by Consumer Reports to find better-quality stainless steel. What's this test?

In past tests, we found that the higher-quality and, yes, higher-priced 300-series stainless like grade/type 304 was less prone to rust and was better able to fight corrosion than the cheaper 400-series stainless.

And since higher grades of stainless steel are typically nonmagnetic and cheaper types usually are magnetic, the magnet test could help you find a stainless-steel grill whose exteriors might hold up better in the long run: Bring a magnet with you to the store and check the stainless on different spots like the firebox, shelf, and cart doors of the models you're considering. Since a company might use the higher-quality stainless only on components subjected to more wear and tear, it's important to check several areas of a grill.

While our magnet test will still help you identify higher-quality stainless like 304, changes in the industry make things a bit less definitive. The cost of some of the raw materials used in stainless steel has climbed in recent years. As a result of ensuing manufacturing changes, some better-quality stainless is now magnetic and some lower grades are nonmagnetic, according to two industry sources, Alex Gafford, director of research and development for Char-Broil, and Mike Kempster Sr., executive vice president for Weber-Stephen Products Co., maker of Weber grills.

You can try to find out which stainless is used by checking in-store displays and brochures and manufacturers' sites and by asking the salesperson when you're shopping. But note that some manufacturers don't indicate which type of stainless steel is used, just that their grills have stainless-steel elements. Other companies do specify the stainless type, like Lynx, which says, "The 304 stainless steel material used in the construction of a Lynx grill is highly rust resistant. . . . "

If stainless is a factor in your grill choice, don't be lured by a lower price—it's unlikely the stainless steel used in a medium-sized grill that costs only $200 to $300 is a high-grade type, unless the grill price is steeply discounted. "You get what you pay for. If you get a big grill for less than $500 and it has lots of stainless, it's a low grade of stainless," says Gafford.

(An option to stainless is a grill made with porcelain-coated steel. This material is durable and won't rust, as long as it doesn't chip. Porcelain is also easier to maintain than stainless and comes in a variety of colors.)

In the end, choose a grill that did well in our tests ( ratings of gas grills are available to subscribers), fits your needs (buy a bigger grill if you regularly feed lots of people; skip a side burner if you'll never use it), and works for your budget. Then use our advice to keep your grill looking good and working well. Also:

• Cover the grill if you live in a coastal area, where the salt air can be especially corrosive to grill parts. Some manufacturers say its better not to cover the grill in certain circumstances like a particularly damp area, where condensation is more likely to collect under the cover, which could damage the grill. Check with the manufacturer of your grill for its recommendations.

• If you do cover your grill, choose a cover with vents, allowing air to circulate and preventing damaging condensation buildup. After a particularly wet or damp period, remove the cover to let it and the grill get dry.

• If you have a pool, locate your grill 50 to 100 feet from the pool to protect it from pool chemicals, which can rust the metal used on your grill.

• Do not use harsh cleaners on a stainless-steel grill. Apply a grease-cutting solution with a soft cloth or sponge, followed by an all-purpose cleaner. Finish by applying stainless-steel polish. Check your owner's manual for other cleaning details.

—Kimberly Janeway

Essential information: If you're in the market for a new grill, read our June 2010 and July 2010 reviews of gas grills and check out our free buyer's guide to gas grills. When you're ready to start cooking, watch a replay of our recent Facebook video chat, try these easy, delicious grilling recipes, Bobby Flay's perfect burgers, and these World Cup-themed international favorites. Also, follow these food-safety tips and use a meat thermometer.