Does it make any sense to install hot water boilers that are sized to match design-day ambient outdoor air temperatures? Every time they turn on, they run full-tilt as if every day is at outdoor design temperatures (coldest weather you experience based on ASHRAE guidelines). Up front cost may be the deciding factor when presented the choice between a chimney-vented lower efficiency vs. a direct-vented high-efficiency modulating condensing boilers. Or maybe it’s the perception that the ...

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