The purpose of this technical brief is to document a comparison energy loss and the resulting impact on boiler efficiency between a boiler operating at a 4:1 turndown compared to a 10:1 turndown. The analysis shows, from an energy balance, that the stack gas losses are higher over a period of time for a boiler operated at 10:1 as compared to a boiler operating at a 4:1 turndown ratio. If the desire is to operate a boiler as efficiently as possible, then there is no advantage to operating to a 10:1 vs. a 4:1 boiler turndown.
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