Won't the hot water hitting the shower floor warm everything up just as well as the warming mat? Call me crazy, but I'm much less nervous about standing on a slightly damp surface with electrical current underneath than standing in a puddle of water under the same circumstances.

Although I have heard of one company who will warranty it, I can't remember who it is off hand, probably because like you said, I'd be bigtime nervous about having an electrical mat in a wet area. The shower water should be more than sufficient to warm the tile up.

Thanks, all. Builder said it could be done, but had to be a separate, low-voltage system that would cost $$$. I waas figuring it could be hooked to same mat as bathroom, but alas no. He had same view--water will heat it up.

I know some people have done it and it's probably very nice. However, consider how you shower. I always turn on the shower and let it get hot *before* I get in. About 2 seconds after that hot water hits your shower floor, it's warm too. I can't really see the real need for it if the dollars prohibit it. Your shower floor will be warmed by the hot water hitting it first. BTW.. I ADORE my warm tile floors.