Patent ID: 7037105

Claim:
A heating apparatus for warming objects on a well site, the well site including an internal combustion engine that drives a well pump for extracting fluid from the well, the heating apparatus comprising: a heat exchanger shell having an input port adapted for connection to an exhaust port of the engine, and an output port for directing exhaust from the engine to the atmosphere; a circulating pump adapted to be driven by the engine; a heating circuit connected to the circulating pump such that liquid in the heating circuit is pumped from a pump output through the heating circuit to a pump intake; wherein the heating circuit comprises: a heat absorbing portion inside the heat exchanger shell connected to the pump output and arranged such that heat from the exhaust of the engine is transferred to the liquid in the heat absorbing portion; and a heating conduit connected at one end thereof to the heated portion to receive heated liquid from the heated portion and connected at an opposite end thereof to the pump intake, and adapted to be arranged adjacent to an object to be warmed such that heat from the liquid in the heating conduit is transferred to the object to be warmed.