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Boiler systems with design input of at least 1,000,000 Btu/h shall comply with the turndown ratio specified in Table 6.5.4.1.
The system turndown requirement shall be met through the use of multiple single-input boilers, one or more modulating boilers, or a combination of single-input and modulating boilers.
All boilers shall meet the minimum efficiency requirements in Table 6.8.1-6.
Table 6.5.4.1 Boiler Turndown
Boiler System Design Input, Btu/h Minimum Turndown Ratio
≥1,000,000 and ≤5,000,000 3 to 1
>5,000,000 and ≤10,000,000 4 to 1
>10,000,000 5 to 1

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