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Our building has a boiler equipped with a two stage (hi/low) oil burner. The boiler produces domestic hot water through a heat exchanger (no storage tanks, unfortunately).

I’ve heard that the burner is sized for peak heat production (ie, cold winter days), and that running on the “low” setting should be sufficient (and more efficient) for summer hot water production. Is this commonly done? Does it require adjustments to the fuel/air mix?