The flow of water in a multiple-circuit hot water heating system is controlled by:

The flow of water in a multiple-circuit hot water heating system is controlled by:

The flow of water in a multiple-circuit hot water heating system is controlled by:




a. Vacuum pumps
b. Diverter fittings
c. Balancing valves
d. A circulating pump in each heating zone
e. An expansion tank in each heating zone





Answer: D


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