Triangle Tube’s Challenger Solo is a compact, high-efficiency, modulating, condensing boiler, perfect for small- to mid-size residences. The Challenger Solo provides both space heating and DHW and is available in four models from 84,000 to 145,000 Btu/hr. The boiler combines with an indirect water heater sized to meet the hot water demands of the residence. It vents with either twin vent and air piping or with concentric venting. The unit’s heat exchanger features a copper tube waterside with an aluminum airside for efficient heat transfer and reliable performance.

Triangle Tube.