Hot water boilers operating with a 250°F water temperature and ___ psi water pressure or less are classified as low pressure.

The effect of hydrostatic pressure must be considered when calibrating a pressure gauge.

A(n) ___ water softener softens water by replacing calcium and magnesium with sodium.

Corrosion can be prevented by preheating the feedwater fed to a boiler to help remove oxygen and carbon dioxide.

In a low pressure gas system, the manual reset valve cannot open until the gas pilot is lit.

The effect of hydrostatic pressure must be considered when calibrating a pressure gauge.

Because each section of a(n) ___ boiler is modular, sections can be assembled on-site to produce the boiler capacity required.

Because each section of a(n) ___ boiler is modular, sections can be assembled on-site to produce the boiler capacity required.

Flash gas is a refrigerant that boils off and cools liquid refrigerant when some of the refrigerant molecules absorb heat from the other refrigerant molecules.

___ weakens the metal and shortens the life of a boiler.