This is my first experience with a water heater cover. As I have no basis for comparison, I am rating the product as good. I can tell that the water stays warm longer as it runs through the pipes, that is, I don't have to run water as long as I used to before the warm/hot water comes out. Also, the little room where the heater is installed is not as warm as it used to be, all the heat stays in the boiler. Made my day!