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Purchasing Energy-Efficient Large Commercial Boilers | Department Find more Heating and Cooling Equipment efficiency requirements and a full list of Lifetime Savings for Efficient 3,000,000 Btu/h Gas-Fired, Hot Water Boilers to NIST Handbook 135 and NBS Special Publication 709 (NISTIR 85-3273-35), sources for energy-efficient products are the General Services Administration Boilers | Products | Residential […]