U.S. Boiler Co.’s new Firetube condensing gas boiler joins the K2 high-efficiency series. The 95% AFUE K2 Firetube features a stainless-steel vertical fire-tube heat exchanger and is available in six sizes from 85 mbh to 270 mbh. A combi version is also available (155 mbh). All models can be wall-hung and feature 5:1 modulation.

The new, easily-installed boiler features an ergonomically angled touch-screen display, which interfaces with the proven Sage2.2 boiler control system and wireless outdoor rest.  Additional contractor-friendly features include a 3-in-1 vent connection; top or bottom supply/return/gas connections; a split voltage junction box with fused connection boards; and a full-height side access panel.