I have a 120 litre unvented cylinder and considering installing a mixer shower, I'm on economy 7, storage heater etc...I live alone and shower daily, at present I have an electric over bath which isn't ideal, and opting for walk in set up, would 120 litre be enough for water or should I go for 10.8 electric, I want the most economical set up, as current tarrifs are frightening, much appreciated
Jim
