Weil-McLain now offers its advanced high-efficiency Evergreen condensing boiler line in 70, 110 and 115K BTUH input sizes, joining the existing 220, 299 and 399 sizes. The 95 percent AFUE boiler features a guided setup wizard, easy-to-understand graphical user interface, simple controls and 10 heating system presets for quick setup. It also has the ability to cascade two to eight boilers together and ZoneStacking up to 24 programmable zones with no external panel required. In commercial applications, optimal energy-efficiency yields reduce energy costs with up to 96.5 percent combustion efficiency. Three multiple-boiler sequencing options are smart mode, series mode and parallel mode. Units may be wall-mounted or floor-standing, use natural or propane gas, and each features a stainless steel, fire-tube heat exchanger with a non-metallic base.