Knocking kitchen and playroom into one large room to have large dinning kitchen. am looking at flooring and have always liked tiles. the kitchen area is going to be quite tight also so don't want to loosse the space with a radiator so was thinking about underfloor heating. How does it work ie is it better to have separate sytem or can it be joined into cental heating/hot water system. How much approx is it to fit? (hubby says we can't afford it with out knowing the cost :-(