The existing cement lined hot water tank, approximately 750 gallons, was originally heated with a hydronic tube bundle. The tube bundle was removed and replaced with a 670 MBH water heater in 1990. In recent years, the old tank was discovered to have the cement liner breaking up and falling to the bottom of the tank. The existing heater had no storage capacity and an 80% efficiency rating. After the cement liner was tested and found not to contain asbestos, the tank and associated piping, valves and electrical were removed. A new 125 gallon, 400 MBH propane fired condensing water heater was installed along with a new “smart” circulator and expansion tank in the mechanical room. All utilities to the system including a PVC exhaust vent through the flue opening from the old heater were connected. A new floor sink with 2″ drain was installed. All hot water components were insulated. Start-up of the new system was provide by a factory certified technician.