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A condensing boiler achieves high efficiency by condensing the vapor in exhaust gases and recovering its latent heat of vaporization.

If combustion is not complete before gases come in contact with a heating surface, the gases will cool and create soot and smoke.

A(n) ___ valve is the valve used to cut a boiler in on-line or take a boiler off-line.

The two types of low water fuel cutoffs normally used on hot water boilers are the ___-type and the probe-type cutoffs.

Accidents that occur must be reported regardless of the nature.

Return steam traps are commonly found in modern boiler plants.

A ___ valve protects a fuel oil pump from excessive pressure by discharging fuel oil through the return line to the fuel oil tank.

Accidents that occur must be reported regardless of the nature.

In a high pressure gas burner, the gas mixes with the air on the inside of the ___.

A ___ valve protects a fuel oil pump from excessive pressure by discharging fuel oil through the return line to the fuel oil tank.