A ___ is used to prevent a dangerous vacuum from forming in a boiler when it is taken out of service.

Common types of hot water system valves include diverter fittings, three-way valves, and centrifugal valves.

___ heat is the ratio of the heat capacity of a substance to the heat capacity of a standard substance at the same temperature.

A strainer should be installed before an RPZ backflow preventer to remove any foreign matter that could cause the preventer to malfunction.

A typical steam heating system operates at temperatures above ___°F.

Radiation has a major impact on all cooling systems.

Gate valves are commonly used as feedwater stop valves.

A combination heating system uses all the components of a hot water heating system and a steam heating system.

Radiation has a major impact on all cooling systems.

Larger boilers are designed to use mechanical draft, which can be controlled more precisely and results in higher combustion efficiency.