Originally Posted by secutanudu
What manufacturer do you recommend? I have a 5'x6' bathroom with a 3x3 shower, so 39 sq feet. Any estimate on how much the supplies would cost to heat a room that size with low voltage? Just one outside 6' wall that will have R13.
Sorry I haven't answered your questions. I've been working.
The only low voltage system you can use to heat both the floor and shower is Heatizon Systems' Floorizwarm Tuff Cable. The kits come with the cable, clips, digital programmable thermostat with in-floor sensor and the transformer. You will also need to buy (1) cold lead splice kit to be able to cut the element and 'jumper' it through the curb into and then back out of the shower.
As for the size, I need you to clarify if the dimensions you've given (5' x 6') are the total bathroom or the actual open floor dims? Also, the 3 x 3 shower is the total shower, right? You need to deduct the (approx) 1sf for the drain area.
As for primary heating, whether you use electric or hydronics, if you are planning on making the radiant heat your only source for heat, you should do a heat loss calculation. Once you have the load numbers, you design the system to generate enough btu's (or watts) to much
more than replace what you are loosing. Most important thing to keep in mind when accomplishing a HLC; garbage in, garbage out!
You asked how hot the element gets. The element doesn't get hot and then wait for the floor to catch up. Since the element is embedded in the mortar, the mortar (or SLC/Thinset, etc) will heatsink the heat off the cable and make it all heat up evenly. The standard set back is about 7 -10 degrees. The tstat regulates the floor temp.