A(n) ___ is matter that contaminates air, water, or soil.

In an air atomizing burner, steam and fuel are discharged to the burner for combustion after the flames reach the end of the combustion chamber.

A hot water heating system operates at ___.

A hot water heating system operates at ___.

Most noncondensing boilers could be forced to condense by changing the set points of the controls.

Most noncondensing boilers could be forced to condense by changing the set points of the controls.

A hot water heating system is isolated from the makeup water supply line by a ___.

Steady-state efficiency is a measure of how efficiently a boiler’s burner burns fuel without considering any losses.

In addition to safety valves, four other types of valves are sometimes used on boilers to prevent overpressure.

During bottom blowdown, the boiler operator should hold the valve handle until the valve closes.