The Bosch Greenstar FS is a condensing gas boiler with an efficiency of 95% AFUE. The FS is a floor-standing unit available in combi or heat-only models and is an Energy Star Most Efficient 2016 product. The unit’s aluminum-silicone heat exchanger offers greater flexibility than stainless steel and is coated to prevent scale build-up and improve efficiency while increasing the life of the boiler. Its compact design and built-in frost protection feature offer greater installation options, and all models are available as propane or natural gas. Combi models feature a domestic hot water output of up to 4 GPM, and all models are insulated to provide low operating sound levels.
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