I was interested in this range too. They don't have duel fuel but I still called the company. I did learn from the representative that I spoke with that the ranges made by that company for Costco is of lesser stainless steel quality than their ranges made for other retail.

:( I was sad to hear that as I thought it might have been a nice alternative to the fabulous eye-candy but expensive Wolf product.

I find it really hard to believe that a company would use different grades of stainless based on the retailer. Seems odd and not terrible effective from a manufacturing perspective. Any way, if you're concerned about that, just go to NXRs website and buy directly from them. Their selling the same range for the same price.