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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.

___ 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.

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

Oxygen in boiler water is used to remove nonadhering sludge.

Scale acts as an insulating material and reduces the transfer of heat to water.