Seems to be pretty reliable. When we lived in Switzerland our house had heated floor along with radiant heat in the ceilings. Our driveway into the garage was also heated, all from a huge solar water heater.....Been all over the world and never saw anything like it although my uncle had electric radiant ceiling heat in a house he built 60 years ago. My current NC house also has the electric radiant heat in the ceiling. It is expensive to use so I had a heat pump installed. Next DP will have it for sure because this one has wood and tile floors, cold in the winter.