Ultrasteel Direct unvented hot water cylinder designed to heat water using electricity via the two 3kW immersion heaters - smart immersion heater fitted as the primary heat source with secondary immersion suitable for use in conjunction with off-peak/low tariff. Manufactured from high grade Duplex stainless steel, this direct hot water storage cylinder is perfect for use in all electric buildings or properties with no access to gas grid and provides hot water in a quick and reliable way.