Patent ID: 8498523

Claim:
A hybrid tankless water heating system having a system input and a system output and configured to provide a water supply, wherein said hybrid tankless water heating system is housed in an enclosure having a top and comprises: a heat exchanger having an input and an output, a buffer tank having an input and an output, an internal recirculation flow watercourse, a pump, a modulating valve, a main flow path having an inlet and an outlet, wherein said main flow path outlet is connected to said system output, wherein said input of said buffer tank is fluidly connected to said output of said heat exchanger thereby positioning said buffer tank at a downstream location from said heat exchanger, and said internal recirculation flow watercourse fluidly connects said main flow path inlet and said main flow path outlet, creating a means for simultaneously circulating water through both said buffer tank and said heat exchanger as modulated by said modulating valve and all of said heat exchanger, said buffer tank and said pump are fluidly disposed on said main flow path.