INOV8 offers a line of boilers ranging from 200,000 to nearly 1,000,000 BTUs per hour. We selected a German made high quality cast iron boiler that is capable of accessing all flue passageways for cleaning. Fuel versatility is our strong suit, as the boiler will accept a wide range of combustible liquids including, but not exclusively: diesel, number 1' 2 fuel, all weights of crankcase oil including synthetic, 90-weight gear, transmission and hydraulic fluid, etc.