Performance Column
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Annual Fuel Utilization Efficiency (AFUE): A metric used to compare the energy conversion efficiency of residential boilers.
Annual Energy Use: Based on the test method referenced in 10 CFR 430, Subpart B, Appendix N and is presented in therms.
Annual Energy Cost: Calculated based on an assumed natural gas price of $0.594/therm, which is the average price at federal facilities.
Lifetime Energy Cost: Future natural gas price trends and a 3% discount rate are from Annual Supplement to NIST Handbook 135 and NBS Special Publication 709, Energy Price Indices and Discount Factors for Life Cycle Cost Analysis – (NISTIR 85--37 update 1).
Lifetime Cost Savings: The difference between the lifetime energy cost of the less efficient model and the lifetime energy cost of the ENERGY STAR model or best available model.
Best Available Model Column
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Based on the December ENERGY STAR-Qualified Products List; values shown are rounded to the nearest dollar. More efficient models may be introduced to the market after FEMP's acquisition guidance is posted.
ENERGY STAR Model Column
Based on December ENERGY STAR efficiency levels; values shown are rounded to the nearest dollar. Federal agencies must purchase products that meet or exceed ENERGY STAR efficiency levels.
Less Efficient Model Column
Based on products that meet the minimum federal energy efficiency standards.
Products meeting ENERGY STAR or FEMP-designated efficiency requirements may not be life cycle cost-effective in certain low-use applications or in locations with very low rates for electricity or natural gas. However, for most applications, purchasers will find that energy-efficient products have the lowest life cycle cost.
Agencies may claim an exception to federal purchasing requirements through a written finding that no FEMP-designated or ENERGY STAR-qualified product is available to meet functional requirements, or that no such product is life cycle cost-effective for the specific application. Learn more about federal product purchasing requirements.
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