Suitable for residential and commercial applications, Evergreen™ Condensing Boiler features stainless steel fire-tube heat exchanger with non-metallic base. Unit offers guided setup wizard, GUI, and 10 heating system presets for quick setup. For customers that require multiple boiler setup, Evergreen offers ability to cascade 8 boilers together and ZoneStacking™ of up to 24 programmable zones. Offering floor standing or wall mount options, boiler comes in 220, 299, and 399 MBH sizes.