204 Energy waste 93% efficiency Conventional combi boilers: Water vapour is discharged through the flue in vaporising phase and latent heat within the water vapour is ignored. 109% efficiency Condensing combi boilers: the flue gas collides with influent water before being discharged. Due to this occurrence, latent heat within the water vapour is then released. 150°C <70°C energy-efficient solution Fresh air Fresh air Fresh air Fresh air Flue gas Flue gas
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