Gledhill Stainless lite Pre-Plumbed IND250 Indirect Unvented Cylinder System Boilers. (7-10 Days as the pre-plumbed cylinders are made to order). Pre-plumbed indirect stainless steel unvented cylinder designed to be fitted with a System boiler and comes complete with 2 heating zones. 50mm of our HCFC free Enviro Foam insulation to achieve astonishingly low levels of heat loss, which maximises energy efficiency for your customers. Pre-Plumbed IND250 Indirect Unvented Cylinder Features. Gledhill unvented cylinder installation guide. Designed to work with SYSTEM Boilers. Comes with 2 heating zones pre plumbed. Weight – empty 49KG, full 297KG. Heat up time 36 minutes. Secondary return – Yes. Maximum inlet pressure 12 Bar. Pressure reducing valve 3 Bar. Max working pressure 6 Bar. 50mm insulation to reduce heat loss. Lightest cylinder on the market. What Do You Get In The Box? 1 x Pre-plumbed Stainless Lite Plus Unvented cylinder. 2 x 3KW Incoloy 825 immersion heater. Lift up temperature and pressure relief valve. 3 Bar inlet control. Compression fittings supplied with unvented products. 90 degree elbow supplied on the hot water draw off to reduce installation time.