Near our local hospital I realized that they had hydronic heating on that sidewalk. This is so of the fact that snow does not stick with the sidewalk. It melts the snow and also eradicates ice so that older individuals can walk on it easier. I bet it was really expensive to get working but it is really worth it. How it is installed is usually that piping is put inside the cement. The pipes literally are inside cement. The pipes carry warm water that is produced by a boiler system. The boiler gets hotter the water. The other day the sidewalk had a situation. There was a crack within the piping that connects to a boiler. So that the water could not be warmed and could not flow in the pipes. However since the piping was in the cement, the HVAC technician needed shovel under the sidewalk. He have to essentially make a tunnel below the sidewalk. One of the problems with this is that it is possible the sidewalk will collapse thereafter in turn make more problems. Fixing the piping once it happens to be installed in the cement is lengthy and involved. Really electric mats might have been better. They would be in the cement. That way the HVAC online business would just tear out that cement and replace the rugs with new. Since it ended up being hydronic heating it involved steaming, a huge mess and a lot of time to repair. When working properly we can see where having heated floors installed inside the sidewalk would be ideal.