In our new place, the ensuite in our bedroom is pretty newly decorated/tiled etc. I woudl have preferred a power shower in there that ran off of the hot water rather than the electric shower that is there. Rather than rip everything out, i wondered about upgrading the shower to a 10.5kW version in the hope it will come near to a decent shower. How do i tell what size cable is fitted currently and whether it can handle the kW increase? The supply cables look like big cooker size cables, but i think i need to check a little more accurately than that!