Hot water booster

A heating system comprising a fuel consuming furnace having an exhaust flue for the egress of stacked gases, a water pre-heating coil, said water pre-heating coil installed within said exhaust flue, said water pre-heating coil having first and second pipes at the ends thereof, said fuel consuming furnace having heating coils therein, said heating coils having an inlet end and an outlet end for the passage of water therethrough, said outlet end for communicating hot water for consumption, a water storage and mixing tank, said water storage and mixing tank having first and second outlet pipes communicating to the interior of said water storage and mixing tank, said first outlet pipe of said storage and mixing tank fluidly communicating with said inlet end of said heating coils, said second outlet pipe of said storage and mixing tank fluidly communicating with said second pipe, a cold water supply pipe, said cold water supply pipe communicating fluidly to a source of cold water, said cold water supply pipe and said first pipe of said water pre-heating coil fluidly communicating to each other into an inlet pipe communicating to said interior of said storage and mixing tank a heat sensor, said heat sensor being disposed adjacent said exhaust flu in the vicinity of the location of said water pre-heating coil, said heat sensor for operating a pump, said pump discharging water into said inlet pipe of said storage and mixing tank wherein the temperature sensed by said heat sensor is elevated to a predetermined level.