The gas-fired CHS line of condensing, high-efficiency, stainless steel boilers from Slant Fin Corp. is available in eight wall-mount models. Each boiler modulates up to a 5-1 turndown ratio with sizes ranging from 85,000 to 399,000 Btu per hour. Inputs can be installed with top or bottom supply and return connections, top or bottom gas connections, vent runs of up to 150 feet and five vent termination options. The ASME-certified fire-tube exchanger is made from 316L stainless steel for corrosion resistance. 516/484-2600; www.slantfin.com.