First I want to say how much I enjoy reading posts on this forum! I try to learn from advice given by the pro’s who are kind enough to help others who are having issues. My system is close to 10 years old and is a Climatemaster split 2-stage 4-Ton system. I just lost the ECM blower motor on my AHU last month. It was a real scare for me and I was glad it was nothing too complicated. I am still very pleased with the performance of this system and have no regrets on the investment that I made. My question is on the life of the storage tank and if I should change it when the water heater finally goes out. I have municipal water and there is calcium build up at some of the piping connections. Other than that it is of good quality. Everything is installed in a utility room, with very little piping involved to the geo unit.