Gledhill ES 90L Direct Unvented Cylinder Stainless Steel. The Stainless ES is an unvented cylinder available in direct and indirect configurations. Value engineered, the Gledhill ES 90L Direct Unvented Cylinder 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. Delivers mains pressure hot water, enabling high flow rates for showers and baths, without the need for a boost pump. Gledhill ES 90L Direct Unvented Cylinder Stainless Steel Features. Gledhill unvented cylinder installation guide. Gledhill unvented cylinder brouchure. Maximum inlet pressure 12 Bar. Pressure reducing valve 3 Bar. Max working pressure 6 Bar. 40mm insulation to reduce heat loss. Manufactured from highly corrosion-resistant duplex stainless steel. What Do You Get In The Box? 1 x 3KW immersion heater. Temperature and pressure relief valve. 3 Bar inlet countrol. Gledhill Stainless ES is covered by Section G3 of the Building Regulations (England and Wales). Technical Standard P3 (Scotland) and Building Regulation P5 (Northern Ireland). Compliance can be achieved via a Competent Person Self Certification Scheme or notificaton of installation to the Local Authority Building Control Department.