The Buderus SB series of high-efficiency condensing boilers is made of 316 titanium steel, giving this boiler a longer service life, and stronger than other boilers in the market. With its dual return feature this boiler is capable of having a 98% AFUE rating making it one of the highest efficiency in its market. This series can be used with multiple fuels including natural gas, propane, or heating oil.

With inputs ranging from 563 to 2200 MBH, the Buderus SB625WS Series has an increased maximum operating pressure to 80 psi, and a 10 year non-prorated limited warranty. A full three-pass flue design extracts latent heat and maximizes overall efficiency.