Hi, we have a leaking Mira Sport shower, 7.5kw. A friend of mine has a 9.0kw one for sale, but I don't know if the cabling will take the extra, how can I tell. If I look at the fuse box there is a fuse for shower plus about 4 different things (lights etc) all listed under RCD protected circuits and this says 80a, there does not seem to be individual amps listed for each fuse. Thanks in advance for any advice.