Can anyone help, we have just moved into a new house, there are 8 storage heaters already installed, 4 run off a 60amp consumer unit (4 wired 15amp fuse)the other 4 run of a MCB 60amp consumer unit 4x16amp.all run on economy 7.I want to add 2 more heaters, should I replace the old 4 way wired fused unit, with a 6 way MCB unit, and would 80amp be OK?