The Olsen OLSSC is a discontinued modulating condensing gas boiler with an efficiency of 96% AFUE. It was designed for wall mount installation and could be used with either natural gas or propane. A 316L/444 stainless steel fin tube heat exchanger improved heat transfer and was self-cleaning to remove hard water deposits and prevent scaling. The OLSSC had a text display control with features including outdoor reset, priority domestic hot water and control capability for up to 16 boilers. Safety features included low water cut off, 30 PSI safety relief valve, boiler drain valve and condensate drain with built-in trap.
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