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Just installed 9Kw instant water heater serving cloakroom basin. 15 M run of 10mm cable back to domestic fuse board on to 40 amp fuse. Trouble is, when the hot tap is turned on and the heater energises the house lights go dimmer??

I am planning to install a shower and hand basin on the first floor of a detached garage. First thoughts included an electrically heated shower and an electric hot water heater over the basin. However I have sufficient head room to mount a small HW cylinder with an emersion heater. How would I...