The very attractive lime green panels are styrofoam insulation for under the tubes.
Spirals of tubes snap into the lego-like panels...
and are attached to the control panel
Lightweight rebar is then placed on top of all of this and 4 cm of cement is poured.
After that, tiles are laid.
Radiant floor heating is the most cost efficient heating system because the water only has to be heated to 38 degrees centigrade (about 95 degrees fahrenheit), instead of 65 degrees centigrade (140 degrees fahrenheit) like normal radiators.
Solar panels are actually capable of heating water to that level and are ideal for radiant floor heating in the shoulder seasons of late fall and early spring.