My home has Radiant Floor heating. I love it. However, it's copper pipe in the concrete slab and just had its 50th birthday. Every other house in the neighborhood has long since stopped using their radiant heating due to leaks and break-downs and I imagine mine will give out in the next few years. So before I embark upon a re-flooring project, I'm wondering what people might recommend as a retrofit/new system on a slab. My new floor is going to be tile, and I'd like it to be toasty under my feet. I also have a brand new HW heating system supplying the current slab pipes and upstairs baseboards.