Radiant heat: temperature of the floor
Been doing a lot of research for heated floor to install in our current small bath remodel (2nd floor). The installation we pretty much agreed on is:
a. Cerazorb or other insulating cork.
b. RPM mats (do I need to staple it to cork?)
c. Floor heating wires (2" spacing); 2 sensors
d. SLC over wires
e. Thinset / porcelain tiles / grout
1. We currently don't have 240v line, but can get it from the basement. How important this is in heating: does the floor warms up faster / warmer? Should we even bother?
2. Been considering Suntouch Warmwires and Warming Systems wires. With 2" spacing Warmwire produces 15w/square foot, Warming Systems - 12w/square foot. Also Warming Systems says that max temperature is 90 degrees with good insulation. Can't find same info for Warmwires. Does the voltage (120 v 240) play a role in how warm the floor is? What is the max temperature I can get realistically?
3. The room is 8'x5'. 3'x5' of that will be shower with Kohler cast iron pan. Do we need to install cork / RPM mats / SLC (but no wires) under shower pan to make floor equally even? If not, what do we install under shower pan to bring the floor to the same height with the rest of the room? Does it need to be same height?