This saves a considerable number of energy dollars compared to heating at peak electric rates during the day. They have been in extensive use in Europe for decades. Hydronic radiant floor systems pump heated water from a boiler through tubing laid in a pattern underneath the floor. The temperature in each room is controlled by regulating the flow of hot water through each tubing loop. This is done by a system of zoning valves or pumps and thermostats.
Wet installations are the oldest form of modern radiant floor systems.
If the new floor is not on solid earth, additional floor support may be necessary because of the added weight. You should consult a professional engineer to determine the floor s carrying capacity. Much of this is because a dry floor is faster and less expensive to build. There are several ways to make a dry radiant floor. This method usually requires drilling through the floor joists in order to install the tubing.