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“The Dirty Little Secret Associated With High Turndown Ratios”
The dirty little secret associated with high turndown ratios is that, in most cases, the boiler is no longer condensing. Aggressive turndown capabilities usually lower the dewpoint and reduce the window of opportunity to condense due to excess air. The 970 BTU/lb. of condensate that engineers expect to get from the system, will continue to go straight up the flue.
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