Techno Gas Stove Review . 4 thelin echo direct vent (ng) natural. Piezo ignition for quick operation and adjustability also comes with. Ilve UMT120FDMP 48 Inch Freestanding DualFuel Range with 6 Sealed from www.ajmadison.com Best dual fuel gas range: 1)the high cost of the canister; Delivers up to 10,000 btus of heat.