Redring Powerstream 12kW Unvented Instantaneous The Redring Powerstream unvented instantaneous water heater delivers instant hot water at point of use. This compact and unique design allows easy installation in 4 different orientations, providing fantastic flexibility in addition to eliminating the need for centrally stored hot water cylinders saving on electricity usage and important space. The Redring Powerstream is rated 'A' in energy efficiency and comes with a 2 year UK guarantee. - 12kW unit is the highest rated single phase heater on the UK market - Water supplied to either one or two outlets: Either two hand wash basins (Please note when both are in use the hot water flow will be shared between the two outlets) Or one hand basin and a .