AERCO’s multi-fuel condensing hydronic boiler can be fired with natural gas, propane or #2 fuel oil (as a backup). The boiler can be installed in health-care facilities, military bases, industrial operations and other large applications. The series in available in six models from three to 10 million Btu/hr. capacities. The MFC is designed for a condensing application in any closed-loop hydronic system and has a four-pass fire-tube heat exchanger.