Electronic fuel:air ratio controls enable you to:

• run your boiler at a lower temperature or pressure when demand permits
  
• have burners automatically adjust to suit different processing or heating loads
  
• have the boiler setpoint automatically change to compensate for external variables, for example: automatically adjusting the controls in a heating application to compensate for changing outside temperatures

ETC electronic fuel:air ratio controls have two internal PID modulation circuits.

If a plant does not run continuously then this second PID control's setpoint can be used to switch the boiler to a lower steam pressure or hot water temperature during periods of reduced activity.

One manufacturer employing this approach is LandRover in Solihull. The company uses hot water for paint drying in their paint shop but the process is held on stand-by at night. Using a second boiler setpoint provides them with energy savings of approximately 10% pa.