Sorry for the lack of information of the wbnsite, it badly needs an update.
The only kit that meets your requirement is the current HFS-6 system:
www.aquamist.co.uk/HFS6/HFS-6-3w.pdf (use manual dowmnload). Please go through the user manual, I will do my best to answer you questions.
I suggest you visit the HFS-6 specific section on this forum. There are a great deal of information there.