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estimated average fuel conversion efficiency of common heating appliances
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| | fuel type | heating system | efficiency (%) |
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| Coal | Central heating, hand-fired | 45.00 |
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| Coal | Central heating, stoker-fired | 60.00 |
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| Coal | Water heating, pot stove (50 US Gal.) | 14.50 |
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| Oil | High efficiency central heating | 89.00 |
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| Oil | Typical central heating | 80.00 |
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| Oil | Water heater (50 US Gal.) | 59.50 |
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| Gas | High efficiency central furnace | 97.00 |
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| Gas | Typical central boiler | 85.00 |
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| Gas | Minimum efficiency central furnace | 78.00 |
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| Gas | Room heater, unvented | 99.00 |
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| Gas | Room heater, vented | 65.00 |
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| Gas | Water heater (50 US Gal.) | 62.00 |
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| Electricity | Baseboard, resistance | 99.00 |
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| Electricity | Central heating, forced air | 97.00 |
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| Electricity | Central heating, heat pump | 200.00 |
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| Electricity | Ground source heat pump | 300.00 |
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| Electricity | Water heaters (50 US Gal.) | 97.00 |
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| Wood & Pellets | Franklin stoves | 35.00 |
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| Wood & Pellets | Stoves with circulating fans | 55.00 |
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| Wood & Pellets | Catalytic stoves | 70.00 |
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| Wood & Pellets | Pellet stoves | 87.50 |
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