Fabdec Excelsior cylinders are straightforward to install with long life operation qualities. The Excelsior i 3S is available in a range of sizes in both direct and indirect collections. Fabdec is at the forefront in unvented water heating with top of the range stainless steel manufacturing. The Excelsior i 3S also offers an automatic replenishment of the expansion with no need to top up the air gap, saving time and money on maintenance. No external expansion vessel is needed for both direct and indirect cylinders, saving time and space on installation.