I have a gainsborough sv800 shower I have the temp gage on full and i only get luke warm water. my parents had the same problem a while ago in there caravan it wanted descaling i cannot remember how it was done, I was wondering if this can be done to my shower. the main reason for asking is i have a fully tiled bathroom and the tiles where fitted around the shower and should i have to replace it, the shape of the new shower and plumbimg may be differant. thankyou.