Safe, reliable, and efficient that's the Alpine boiler, NEW from Burnham! The Alpine is a fully modulating condensing gas boiler with a 95% AFUE. At the heart of the Alpine is a durable, high efficiency stainless steel heat exchanger. Water flows through a series of stainless steel coils that completely surround and capture the heat from the combustion chamber. This design ensures maximum heat transfer at all times and the ability to condense, which further enhances efficiency. Complete modulation of firing rates ensures that the boiler will only operate as much as it needs to in order to answer the call for heat. The new Alpine it's the peak of efficiency, safety, and reliability... only from Burnham Hydronics!