I am having a new home built and I will have gas tankless hot water heater. I will have a recirculating pump to the master bathroom. I am considering adding a 40 gallon electric hot water heater to use as a reserve tank. My challenge is that I have found very little info online as to how to do this. Do I have the water from the street go into the electric tank water heater and heat the water to say 100 degrees and then when the tankless system asks for water it pulls water from the electric tank water heater into the tankless Or, Do I have the cold water from the street go into the tankless and heat the water and then store the water in the electric water heater tank and the water is then distributed throughout the house from the electric water heater Or, do the recirculating pump to the master bath make this all unnecessary. I am concerned about the gas tankless water heater cycling on and off frequently and wearing out sooner than it should. Any assistance would be appreciated.