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

Stop valves before and after a pressure-reducing valve allow servicing of the pressure-reducing 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 steam strainer should be located in a steam line after a steam trap.

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.

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

A(n) ___ is a hot water boiler fitting that serves as a boiler water setpoint temperature control system with an outside air thermostat.

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