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A flammability hazard on the NFPA Hazard Signal System indicates the degree of susceptibility of materials to explode or release energy by themselves or by exposure to certain conditions or substances.

A feedwater ___ valve is located next to a feedwater stop valve and prevents feedwater from flowing from the boiler back to the feedwater pump.

In a natural-circulation hot water heating system, the ___ functions as a relief valve.

The location of an auxiliary low water fuel cutoff allows it to act as a backup if the primary low water fuel cutoff fails to shut the burner OFF in a low water condition.

A flammability hazard on the NFPA Hazard Signal System indicates the degree of susceptibility of materials to explode or release energy by themselves or by exposure to certain conditions or substances.

___ are used in boilers to direct the gases of combustion for multiple passes to obtain maximum efficiency.

An aquastat controls the burner by sensing steam pressure in a hot water boiler.

In a natural-circulation hot water heating system, the ___ functions as a relief valve.

___ is the condition where a flame travels upwind and into the burner assembly.

Stop valves before and after a pressure-reducing valve allow servicing of the pressure-reducing valve.