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The two general categories of boilers are hot

The two general categories of boilers are hot water and steam boilers most small commercial buildings, manufacturers, and even some food processors use hot water boilers water is heated to appropriate distribution temperatures, typically 140-180°f, and usually returned about 20°f lower temperature for reheat these systems are often "closed" with virtually no fresh water make-up where applicable, hot water boilers are preferred because they normally do not need.

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