Michael Kitt (Galway East, Fianna Fail) | Oireachtas source

The idea of zonal heating is something I have heard about only recently, but I am sure it has been around for ages. This is with regard to larger houses, and I have spoken to people in the business about it. Quite a large house could have two or perhaps three zones. I am concerned about this because if some parts of a house are warm and others are not, is there any issue of water being contaminated in such a situation?