A modern hydronic heating system typically:

A) Heats by circulating hot water through a closed system of piping.
B) Heats both the house and the domestic hot water.
C) Uses water to cool the condenser of a water-to-air heat pump.
D) Heats using low-pressure steam.


A

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____ are characterized as having a high proportion of people working or living in them who exhibit

symptoms of illnesses that may diminish when they are away for a period of time.

a. Newly constructed buildings c. Sick buildings b. Industrial buildings d. Unclean air interiors

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Once a technician works on a system, what else should he or she do?

A) Open the gas flow valve. B) Check for gas leaks. C) Do nothing else. D) Increase household ventilation.

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