I'm installing a similar shower tower, with a rain head and seperate shower hose. you may need to install a pump in the hotpress to give you the pressure required if your system is not pressurised. Then all the electrician needs to do is put a power source in the hotpress (approx 50 euro). I got my showers from the UK (), they worked out 2oo euro's cheaper for the same brand. they will send you all the info and the installation guides by email before you purchase so that you can ask the plumber how much it will cost. I do know if you install something like that on ebay, it costs extra than a shower tower..ask the plumber..if the plumber was to supply and fit a mixer shower he was charging 800 euro's..so ask, it might be cheaper..