Patent ID: 8141199

Claim:
A heat exchanger system comprising: a coil heater assembly having a housing with a heated gas inlet and a heated gas outlet, the coil heater assembly having a plurality of coils formed of a single tube shaped into separate coils with a water inlet and a water outlet, each of the coils being spiraled around its own unique axis, the axes being parallel with respect to each other for maximizing the heat transfer between the gas and water within the coil heater assembly; and a water handling assembly including a pressure regulator and a pre-heater and a mix tank and a water pump to move pressurized water in a closed loop path between the pressure regulator and the pre-heater and the mix tank, the water handling assembly also including an air heating blower powered by the engine, the blower having an air inlet for generating a vacuum, the blower also having a heated air outlet coupled to the pre-heater for preheating water, the pre-heater including a water path with a single spiral wound tube through which water passes while moving from the pressure regulator to the mix tank, the pre-heater also having an air path with an input line from the blower and an output line, the water path and the air from the output of the blower being in heat exchanging relationship within the pre-heater, the mix tank including a water inlet line for supplying make-up water to the system, the mix tank adapted to store pre-heated water for circulation by the water pump.