Expanded line of CREST Condensing Boilers includes three new models with 750,000, 1.0 million and 1.25 million Btu/hr inputs. Featuring the patented Wave fire-tube design and advanced combustion technology, models deliver 96.2% thermal efficiency and up to 20:1 modulation turndown. Line now includes 10 condensing commercial boilers with inputs ranging from 750,000 Btu/hr up to 5.0 million Btu/hr. Fire-tube system ensures smooth, quiet modulating combustion from as low as 5% of the maximum firing rate up to 100% as the heating load increases. Modulation reduces operating costs, enhances long-term reliability and provides improved seasonal and operating efficiencies.