2. Comparison between standard and condensing boilers

2.1 Latent heat recovery

• Latent heat removed by flue gases

  With a conventional atmospheric boiler, a significant proportion of the so-called latent heat is evacuated by the flue gases, causing the temperature of the combustion products to rise sharply, to around 150°C.

• Recovered latent heat

  The use of a condensing gas boiler recovers a very large proportion of this latent heat; this energy recovery has the effect of considerably reducing the temperature of the combustion gases, while limiting polluting gas emissions.

  The water vapour contained in the flue gases condenses on the heat exchanger, which recovers its so-called latent...