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A(n) ___ is a common type of heat exchanger used to heat the air in a building space.

Rotary cup burners atomize fuel oil using a spinning cup and high-velocity air.

Rotary cup burners atomize fuel oil using a spinning cup and high-velocity air.

Water added to a boiler with a low water level condition could cause a boiler explosion.

Cold makeup water reduces overall boiler efficiency because energy is required to ___ the water.

Air flow in a natural draft system is controlled as necessary through the ___.

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

___ 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 ___%.

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