Hi, KC911-
I'm a contractor and we have installed several electrical radiant floor heating systems in client's bathrooms. Every client loves it.
The product we use is called NuHeat. We decided to use NuHeat's product due to NuHeat's custom sizing of the mat to the bathroom floor along with the ease of installation for our tile & electrical contractors and the ease of use for our clients.
If you are planning on doing the install yourself, please be aware of the follow:
1. need a dedicated circuit (20 amp)
2. need to determine where thermostat is going to be located, so you can tell this to NuHeat when the fab the mat. If there are little kids, I like to install the thermostat a little high, so the the kids cannot reach.
3. need to be very cautious when cleaning the mortar from between the tiles as we have heard of people cutting the mat's wires while doing a bad job cleaning out mortar prior to grouting.
Warm floor's product as mentioned by trekkor also may be a great option, we just happen to use NuHeat's product.
If you have time, check out
www.nuheat.com and see what you think.
Best of luck.
Dale