This image shows a typical boiler energy balance for a boiler in good running condition with no energy efficiency measures added. By first identifying the areas of energy loss and roughly quantifying it, it is easier to estimate the overall savings potential by taking efficiency action in that area. For example, if the blowdown loss is 3% of total input energy, it is not possible to expect a 5% savings of input energy by installing a blowdown heat recovery system.
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Oxygen Control (O2 Trim)
Combustion Efficiency Improvement
Oxygen Control (O2 Trim)
Radiation and Convection Losses
Source: Image Boiler Energy Balance from ‘Boilers and Heaters: Improving Energy Efficiency’ Natural Resources Canada, 2001;