Fireplace & Stove Glossary...

Annual Fuel Utilization Efficiency (AFUE):
• operating efficiency rating for gas hearths represents the ratio of
  annual heat output to annual fuel input
• the higher the rating, the more efficient the appliance
• developed by the US Department of Energy

Btu Input:
• indicates the maximum amount of fuel a heater uses in one home
• how efficiently a unit uses its fuel is gotten by dividing its output
  by its input

Burn Time:
• indicates how long a wood or pellet fueled appliance will heat your   home on one load of fuel
• important information for people interested in overnight burns or
  extending heating while you are away

Firebox Capacity
• dimensions of a wood burning appliance’s firebox
• most often expressed in cubic feet
• reveals ease of loading fuel and ease of attaining overnight or
  extended burns

Heating Capacity
• gives you some idea of how many square feet of warmth you can
  expect

Overnight Efficiency
• this percentage tells how well an appliance turns the fuel’s
  potential energy into usable heat in your home
• an average of combustion and heat transfer efficiencies
• in general, the higher the overall efficiency, the less fuel you will
  use

Steady State Efficiency
• a gas units efficiency during operation or how well it transforms
  fuel to warmth in your home

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