On average, 15% of a commercial modulating/condensing boiler’s runtime is spent at high-fire, according to Jim Schnorr, president of Lancaster, Pa.-based Thermal Solutions Products. The unit coasts along at medium- or low-fire for the other 85% of the time. This is the “sweet spot” in which the unit is condensing, providing the high efficiency it was designed for. Read more at PM Engineer Magazine ... http://www.pmengineer.com/articles/92808-thermal-solutions-taco-partnership-breeds-new-boiler-option
