The 700 Cedar Building in Alexandria, MN has been around for over 80 years and has gone through many changes through the years. It was once a hospital but today serves as an office building. The original coal fired boiler is long gone, replaced with a more modern boiler but many of the older components lived on. The heating system consisted of three hot water loops serving the three floors of the building. Each loop has its own circulating pump to move hot water through wall radiators. Above the pumps are three 40 gallon compression tanks to keep the boiler pressure constant. The system was limping along with one pump deceased and another soon to fail. Two of the three compression tanks were leaking and there were constant air issues throughout the building, resulting in gurgling wall radiators that ran cold. To add to the owner’s concern, it was February and a solution was needed quickly that would not inconvenience the many business tenants.