Got bill the other day it has more than doubled. It was in fact the largest bill I have ever gotten. March bill was actual reading, May bill was an estimate, and July bill accurate. Thus the rise has taken place in last 4 months. Nothing different in use so cannot fathom the rise.
No gas for heating and sometimes hot water. Timer on immersion. I cannot see where an extra 100 would come from. Fish tank got with pump is the only change. Does anyone else know if this would cause such an increase?