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What is the difference between the EnerGuide Fireplace Efficiency (FE) rating and those other ratings?

April 26, 2017efficiency EnerGuide Fe fireplace rating ratings

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What is the difference between the EnerGuide Fireplace Efficiency (FE) rating and those other ratings?

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The Steady State rating reported in manufacturers’ literature is the efficiency a fireplace can achieve were it placed in the middle of a room, radiating heat from all its surfaces, running continuously and suffering no energy losses. The Annual Fuel Utilization Efficiency (AFUE) rating averages out a unit’s efficiency over an entire heating season, selectively taking into account some energy losses but ignoring others. The EnerGuide FE rating reports a fireplace’s true energy efficiency by taking into account all its energy losses and by considering its overall performance during an entire heating season, not just on the day of testing.