Slant/Fin’s CHS line of condensing, high-efficiency, stainless-steel, gas-fired boilers is offered in eight modulating and condensing wall-mount models. Each boiler modulates up to a 5:1 turndown with sizes ranging from 85,000 to 399,000 Btu/hr. inputs which can be installed with flexibility — such as top or bottom supply-and-return connections, top or bottom gas connections, vent runs of up to 150’ and five vent termination options. The ASME-certified fire-tube exchanger is constructed of 316L stainless steel for better overall corrosion resistance. This grade of steel is a particularly higher resistance to pitting and crevice.