Duplex stainless steel unvented cylinder providing mains pressure hot water. The slimline heat pump range enables smaller installation areas to be utilised and features a dedicated high performance corrugated heat exchanger coil, maximising the heat transfer from lower temperatures supplied by heat pumps to the stored water. The cylinder is manufactured using the very latest automated welding procedures along with full post weld treatments guarantee welds that are as strong as the parent metal. The product is supplied complete with compression fittings, lift up P&T valve, 90 degree elbow on hot water draw off and flexible hose to connect expansion vessel.