Introducing the Infratech W Series Single Element W2624MG 2600 Watts 240V 10.8 Amps Infrared Electric Patio Heater 48 x 8.19 x 3 in. Marine Grade Stainless Steel Color. Now you can enjoy even longer-lasting performance for an Infratech heating system with our Marine UpGrade. While all Infratech heaters are constructed using high-grade, corrosion-resistant 304 stainless steel, Marine UpGrade heaters incorporate 316, a more robust anti-corrosive steel that offers enhanced protection for the harshest environments, including coastal, alpine, windy, humid and other demanding conditions.