The Gledhill Stainless ES is an unvented cylinder available an indirect configuration. Value engineered, the Stainless ES offers a competitively priced cylinder which benefits from Gledhill’s proven technology and quality manufacturing. The unvented cylinder is manufactured from highly corrosion-resistant duplex stainless steel and is supplied with full NSF WRC and WRAS independent approvals. It is suitable for gas or oil boilers and has a 25 year warranty.