How can a hot water boiler heat water to 250°F and not boil the water?

A) Water treatment is added whose primary purpose is to raise the boiling point of the water.
B) Hot water boilers cannot maintain 250°F water without boiling the water.
C) The water does boil, but the steam is vented to the air.
D) The system is under enough pressure to raise the boiling point above the water temperature in the boiler.


D

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