Patent ID: 8677946

Claim:
A hot water system comprising: (a) a main flow line having an input point and a heated output point, wherein a pump, a buffer tank, and a heat exchanger are fluidly connected in line with and disposed within said main flow line and said pump is configured to move water in a direction of from said input point to said heated output point; (b) an internal recirculation flow line connected in parallel configuration to said main flow line at said input point and said heated output point, said internal recirculation flow line comprises a first adjustable valve and a first check valve for directing flow from said heated output point to said input point; and (c) an external recirculation flow line connected in parallel configuration to said main flow line at said input point and said heated output point, said external recirculation flow line comprises a second check valve to prevent flow from said input point to said heated output point through said external recirculation flow line, wherein when said first adjustable valve and said second adjustable valve are disposed in an open position, the operation of said pump directs a first flowrate through said internal recirculation flow line and a second flowrate through said external recirculation flow line, therefore simultaneously forcing a flow heated by said heat exchanger through said internal recirculation flow line and external recirculation flow line.