Considering installing one of these as we live in west berkshire and the water is very hard. I am told that you can connect directly to the rising water main (after the stopcock!) or just on the drinking supply. I have done abit of plumbing before i.e fitted rads etc but can anyone advise me of any considerations with regard to the instalation. BTW is combimate the best one to go for in the price bracket or shoul I considor other vendors?