Inspect, maintain, troubleshoot, and repair boilers, pressure vessels, humidification boilers, burners, feedwater systems, condensate return systems, fuel systems, steam traps, heat exchangers, expansion tanks, pumps, and other associated mechanical equipment. Inspect, maintain, troubleshoot, and repair steam, condensate, hot water, chilled water, compressed air, natural gas, and fuel gas distribution systems, including piping, valves, regulators, meters, and associated equipment.