On The Rocks
Senior Member
I have one tankless hot water heater heated by the webasto hydronic heating system and one electric/engine coolant heated tank. I have to go to the engine room and turn a selector valve to use one or the other. I am thinking about plumbing them in series with the tankless unit feeding hot water (when it is on) into the cold water inlet of the tank unit. My goal is to not have to open any valves and to use the tank unit to store hot water created by the tankless unit which would give me hot water at the tap faster than the tankless unit can.
Any reason why this wouldn't work?
Any reason why this wouldn't work?