Has anyone converted their water heater to a tankless system? We are full timers and I want to upgrade/replace the current water tank system to a tankless one. Saves a lot of propane as it only comes on when it is needed and doesn't limit the amount of hot water. We had one of these in our house in Japan 30 years ago it was great. They now make them for Atwood water heater replacements for about $650.