"Infrared is really hot," said Leslie Wheeler, a spokeswoman for the Hearth, Patio & Barbecue Association, an industry group in Arlington, Va. "They're great for searing and then either you turn it down or move over to another burner for cooking."
The grills are still powered by propane and have traditional gas burners that heat mostly by convection — or hot air. But they also can cook foods with radiant heat generated by one or more infrared burners. (Infrared falls between visible light and microwave energy on the electromagnetic spectrum.)
Char-Broil says its advanced burners operate at 450 to 900 degrees, hotter than the 450 to 750 degrees of standard gas burners. And unlike charcoal, which can require 20 to 30 minutes to reach its 700-degree cooking temperature, heat from the infrared burners can be adjusted quickly."