/, Contextual, Heating, HVAC, Long term, Operators, Owners, Physical environmental, Psychological/2.2.20 Installation of modulating burners and oxygen sensors

2.2.20 Installation of modulating burners and oxygen sensors

2.2.20 Installation of modulating burners and oxygen sensors


The modulating burners regulate boiler heat output in proportion to demand at any time, reducing the number of turning on and off with respect to conventional burners, achieving greater efficiency in the generation of heat. This measure consists in the substitution or adaptation, in the cases where it is possible, of one or two step burners by modulating burners.

Oxygen sensors, also called lambda probes, operate in a way that they measure the free oxygen concentration continuously inside the boiler, and thus regulate the relation between fuel-air, thus maintaining optimal combustion conditions.


  • These devices may present at least 5% fuel savings

  • The maximum benefit is reached when oxygen sensors are combined with modulating burners


  • In order to have acceptable investment return periods, oxygen sensors should be applied in large boilers, of powers higher than 500 kW and with continued consumption

Economic assessment

Investment: medium. Between 4000 and 6000€ depending on the power.

Payback: medium. Between 3 and 5 years in high power boilers.

References and best practices

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