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Ariston Group introduced a new commercial heating system that improves energy efficiency while also offering increased redundancy and reliability. The Elite ULTRA Duo boilers from HTP include dual heat exchangers that provide built-in operational redundancy. With firing rates between 285,000 to 399,000 Btuh, the boiler guarantees energy savings with up to 96 percent Annualized Fuel Utilization Efficiency (AFUE). The turndown ratio of up to 20:1 limits short cycling and provides more efficient energy consumption. Cascade up to four Duo boilers to further increase redundancy and provide up to an 80 to 1 turndown ratio.