The relieving pressure of a relief valve on a low pressure hot water boiler cannot exceed ___ psi or the MAWP designated on the boiler.

New ___ should be used when replacing a broken gauge glass.

New ___ should be used when replacing a broken gauge glass.

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

Hot water heating systems require less water than steam to transfer the same amount of heat.

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

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 ___.