Q. How do i go about finding installers for preformed concrete stairs? Also interested in the heat mats in place.
A. You didn't say where you were from, so I can't be specific to your location but American Concrete Industries sells preformed or precast concrete stairs with heat mats to melt snow and ice. They also do the installation.
If they aren't local enough, they may know how to locate a precast concrete stair company in your area who sells what you are looking for.