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The CB Combination (Combi) Boiler utilizes high-efficiency condensing technology to deliver hot water to both plumbing and hydronic heating applications, meeting two needs with a single appliance. The unit delivers hot water at a 95-percent efficiency, earning it the highest Energy Star rating. Delivering up to 9.2 gallons per minute of domestic hot water, the CB Combi can be used on a whole host of applications including radiator, baseboard or in-floor radiant hydronic heating. It can also be used in HVAC systems using water-to-air heat exchange with an air handler, and pavement snow melting.