I have moved to a new house that has an electric shower and my bills are so much more than my previous house of teh same size. I use the same goods- cooker, dryer, washer, fridge etc as I did in my last house and use same supplier. The only thing that's different is the electric shower. Our household uses it on average about 90 minutes per week. Could this be a major factor? I presume its like boiling a kettle as it has to heat cold water immediately Any thoughts on running costs for it?