https://www.designingbuildings.co.uk/w/index.php?action=history&feed=atom&title=Annual_Fuel_Utilization_Efficiency_AFUE 2026-04-08T23:45:26Z Revision history for this page on the wiki MediaWiki 1.17.4 https://www.designingbuildings.co.uk/w/index.php?title=Annual_Fuel_Utilization_Efficiency_AFUE&diff=312864&oldid=prev 2025-11-19T20:33:57Z

<p></p> <table style="background-color: white; color:black;"> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 20:33, 19 November 2025</td> </tr><tr><td colspan="2" class="diff-lineno">Line 3:</td> <td colspan="2" class="diff-lineno">Line 3:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>AFUE is calculated by dividing a boiler’s total annual heat output (in BTUs) by its total annual energy input (also in BTUs) and multiplying by 100. In practice, measuring AFUE is quite technical because it requires sensors and equipment to track heat output over time. Once the total yearly heat output is known, it is compared to a standard figure of 100 million BTUs, which represents the typical fuel needed for a heating season.</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>AFUE is calculated by dividing a boiler’s total annual heat output (in BTUs) by its total annual energy input (also in BTUs) and multiplying by 100. In practice, measuring AFUE is quite technical because it requires sensors and equipment to track heat output over time. Once the total yearly heat output is known, it is compared to a standard figure of 100 million BTUs, which represents the typical fuel needed for a heating season.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&minus;</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Related articles on Designing Buildings</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">= </ins>Related articles on Designing Buildings <ins class="diffchange diffchange-inline">=</ins></div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* Approved document L.</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>* Approved document L.</div></td></tr> </table>

Editor https://www.designingbuildings.co.uk/w/index.php?title=Annual_Fuel_Utilization_Efficiency_AFUE&diff=312863&oldid=prev 2025-11-19T20:33:19Z

<p></p> <table style="background-color: white; color:black;"> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 20:33, 19 November 2025</td> </tr><tr><td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">AFUE, or Annual Fuel Utilization Efficiency, is a measure used in the United States to show how efficiently furnaces, boilers, and space heaters convert fuel into usable heat. Set by the U.S. Department of Energy, the rating works on a simple rule: the higher the percentage, the more efficient the appliance. Heating products sold in the U.S. must meet a minimum AFUE of 78%. Each appliance displays its AFUE on a yellow Energy Guide label for customers to compare.</ins></div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">AFUE is calculated by dividing a boiler’s total annual heat output (in BTUs) by its total annual energy input (also in BTUs) and multiplying by 100. In practice, measuring AFUE is quite technical because it requires sensors and equipment to track heat output over time. Once the total yearly heat output is known, it is compared to a standard figure of 100 million BTUs, which represents the typical fuel needed for a heating season.</ins></div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&minus;</td><td style="background: #ffa; color:black; font-size: smaller;"><div>[[Category:<del class="diffchange diffchange-inline">Articles_needing_more_work</del>]]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">Related articles on Designing Buildings</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>&#160;</div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* Approved document L.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* Approved documents.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* Assessment.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* Boiler.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* Building regulations.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* Efficiency.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* Fuel.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* Heating.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* Power.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* Procurement.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* Standard Assessment Procedure.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* Sustainability.</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">* Temperature</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>&#160;</div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>[[Category:<ins class="diffchange diffchange-inline">DCN_Definition]] [[Category:Definitions</ins>]]</div></td></tr> </table>

Editor https://www.designingbuildings.co.uk/w/index.php?title=Annual_Fuel_Utilization_Efficiency_AFUE&diff=312590&oldid=prev 2025-11-15T06:20:26Z

<p>moved <a href="/wiki/Annual_Fuel_Utilization_Efficiency" class="mw-redirect" title="Annual Fuel Utilization Efficiency">Annual Fuel Utilization Efficiency</a> to <a href="/wiki/Annual_Fuel_Utilization_Efficiency_AFUE" title="Annual Fuel Utilization Efficiency AFUE">Annual Fuel Utilization Efficiency AFUE</a></p> <table style="background-color: white; color:black;"> <tr valign='top'> <td colspan='1' style="background-color: white; color:black;">← Older revision</td> <td colspan='1' style="background-color: white; color:black;">Revision as of 06:20, 15 November 2025</td> </tr></table>

Editor https://www.designingbuildings.co.uk/w/index.php?title=Annual_Fuel_Utilization_Efficiency_AFUE&diff=312589&oldid=prev 2025-11-15T06:19:58Z

<p>Created page with &quot; <a href="/wiki/Category:Articles_needing_more_work" title="Category:Articles needing more work">Category:Articles_needing_more_work</a>&quot;</p> <p><b>New page</b></p><div><br /> <br /> [[Category:Articles_needing_more_work]]</div>

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