Flameless heating system

A method of controlling a mobile heating system, the mobile heating system comprising an enclosure supported by a mobile chassis having at least a pair of wheels and a hitch such that the mobile heating system can be towed by a vehicle, the enclosure defining an air flow path having an air inlet and an air outlet, the method comprising:

• generating heat with a first heat source located within the enclosure air flow path and between the air inlet and the air outlet, the first heat source being an internal combustion engine;
• generating heat with a second heat source located within the enclosure air flow path and between the air inlet and the first heat source, the second heat source being a radiator associated with the internal combustion engine;
• generating heat with a third heat source located within the enclosure air flow path and between the air inlet and the air outlet, the third heat source being configured to receive exhaust from the internal combustion engine;
• generating heat with a fourth heat source located within the enclosure air flow path and between the first heat source and the air outlet, the fourth heat source being configured to deliver heat to the air flow path via oil heated by a hydraulic circuit powered by the internal combustion engine, wherein the hydraulic circuit includes a hydraulic pump, a hydraulic motor, and first and second valves, wherein the second valve is upstream of the first valve;
• electronically operating a first valve of the fourth heat source to cause a temperature of the oil to change;
• electronically operating a second valve to adjust the flow of the hydraulic fluid to the hydraulic motor;
• providing a fan coupled to the hydraulic motor;
• and
• operating the fan to transport an air flow stream from the enclosure air flow path inlet, through the first, second, third, and fourth heat sources, and out of the enclosure air flow path outlet.