Fabdec Excelsior cylinders are manufactured from high quality stainless steel. Fabdec have been at the forefront of unvented systems guaranteeing high performance for long periods of time. These cylinders provide hot water at mains water pressure. The Excelsior is also available in both Direct and Indirect Unvented cylinders. No header tank is required as they are a pressurised unit, fed directly from mains water. The Excelsior Indirect is heated through an external heat source such as a boiler; they also include an immersion heater meaning they require no cold water header tanks. However, the Excelsior is heated only by an electric immersion heater, making them ideal for properties without a gas supply.