From our local hospital I realized that they had hydronic heating on this sidewalk. This is so that the snow does not stick on the sidewalk. It melts the snow and also alleviates ice so that older people can walk better on it. I bet it was really expensive to arrange but it is really worth the cost. How it is installed can be that piping is put throughout the cement. The pipes literally are throughout the 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 issues. There was a crack inside piping that connects to that boiler. So that the water could not be warmed and could not flow through the pipes. However since the piping is the cement, the HVAC technician had to shovel under the sidewalk. He had to essentially make a tunnel in the sidewalk. One of the problems with this is that the sidewalk can collapse and in turn make more complications. Fixing the piping once it’s installed in the cement can be lengthy and involved. Really electric mats would have been better. They would be within the cement. That way the HVAC business would just tear out the cement and replace the mats with new. Since the hydronic heating involved steaming, it was a huge mess and too much effort to repair. When working properly we can see where having heated floors installed inside sidewalk would be ideal.