please advise...its doing me head in .just got round to unpacking and fitting the shower after buying it 18 months ago , don't rush things in our house . turned the mains water off , fitted the shower ,bearing in mind no electric connected , turned the mains back on and the water comes out of the shower head full force and does not stop , surely the water should not come out of the shower head until the mains electric is connected and can control the flow of water .thanks for any help.