I have a 1926 Humphrey Ruud Instantaneous water heater (tankless) it has been in continuous service since its installation in the spring of 1926. Recently it developed a leak in one of the water lines, have contacted 6 plumbers who say they have never seen one and don't know how to repair the leak. Also contacted the Rudd Rheem Company who does not have any idea who might know how to repair it. Don't know where else to turn, its a beautiful old heater which still works. Given what some people say about the reliability of today's tankless water heaters I would really like to keep this old one if possible. Any help would be greatly appreciated. Thank you