RBI now provides Spectrum Series boilers with an optional stainless steel jacket. The brushed stainless steel jacket provides corrosion resistance for indoor or outdoor installations in harsh environments such as coastal areas and processing applications requiring wash down. Spectrum Series residential and light commercial gas boilers, water heaters and pool heaters allow for both indoor and outdoor, gas-fired application. The boiler features a reversible, two- or four-pass heat exchanger made from commercial grade 7/8"