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Buderus’ GB42 modulating gas condensing boiler comes in four models that supply from 84,800 to 214,800 Btu/hr., and cascades of up to 16 units for even higher outputs. The GB142 has a modulating operation with output modulations between 30% to 100% (matched to actual heat demand to save energy). It features a AFUE rating of 95% and is EnergyStar-certified. The unit has advanced and easy-to-control integrated EMS controls for outdoor reset and control of an optional indirect domestic hot water tank.
