Some of the disadvantages of a concrete installation would be its non-versatility and large thermal mass. It is not a very versatile installation method because of the weight and physical limitations of working with concrete. It can only really effectively be used on main floor installations, with certain basement configurations. Also because it has so much mass, it takes much longer to heat up and cool down. It may take up to a day for the system to fully heat or cool, which also makes small changes in comfort levels harder to achieve. But once it is heated up, will provide very steady and comfortable heat.