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Immersion type controllers for hydronic heating systems that turn off the burner whenever the boiler water temperature rises to the setpoint. The L4080 and L8080 are immersion type controllers for hydronic heating systems that turn off the burner whenever the boiler water temperature rises to the set point. The L4080 is used to provide high limit protection for line voltage and low voltage systems. All models are available for use with immersion wells or for direct immersion if faster response is needed. To order immersion well refer to form 68-0040 for well descriptions. The L4080 has an adjustable set point. The L8080 is factory-set. Features High Limit Aquastat Controller has adjustable set point. Models available for use with immersion wells or for direct immersion if faster response is needed. A factory-set stop is available on L4080 to prevent setting the control at too high a temperature. Models available with second limit switch to shut off all gas to the burner. Liquid fill in sensing element expands as the boiler temperature rises. At the set point temperature a diaphragm-actuated snap switch breaks the power supply to the burner primary control.