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How can a boiler with 87% AFUE be approved for chimney (Category I) venting without condensing?

April 26, 2017AFUE Approved Boiler category chimney condensing venting

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How can a boiler with 87% AFUE be approved for chimney (Category I) venting without condensing?

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A gas boiler with 87% AFUE can not be approved as a Category I boiler or be chimney vented. Chimney spaces may be used as “chases”, but too much con- densation would occur if a regular chimney were used.