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___ heat must be added or removed to cause a substance to change state between a solid and a liquid or a liquid and a gas.

In actual practice, most condensing boiler efficiencies are around ___%.

Low-water cutoffs must be checked at least weekly or when local ordinances require.

A boiler room log can be used to determine the cause of a boiler shutdown.

Air pollutants are classified as primary pollutants and secondary pollutants.

The ASME Boiler and Pressure Vessel Code requires each automatically fired steam boiler to be protected from overpressure by ___ pressure-actuated control(s).

The ASME Boiler and Pressure Vessel Code requires each automatically fired steam boiler to be protected from overpressure by ___ pressure-actuated control(s).

A boiler room log can be used to determine the cause of a boiler shutdown.

A ___ is a component of a refrigerant system that controls the flow of refrigerant into an evaporator.

When a handwheel is turned to open a nonreturn valve, the stem retracts but the valve ___.