/, Contextual, DHW, Heating, HVAC, Long term, Operators, Owners, Physical environmental, Psychological/2.2.1 Installation of a condensing boiler

2.2.1 Installation of a condensing boiler

2.2.1 Installation of a condensing boiler


It is a boiler that produces water at low temperature (40-60°C), with high performance and low emissions of CO2 and NOx. It is designed to use the latent heat released by condensation of the water vapour contained in the combustion products. It is necessary that the boiler can drain the condensates from the heat exchanger in liquid form through the condensation drainage. Gases, when condensing, transfer part of the latent heat to the water in the primary circuit. Being a medium temperature boiler, it is compatible with radiators and underfloor heating installations.


  • Better performance than conventional boilers

  • Higher rate of modulation

  • Noiseless

  • Until 27.5% savings on heating consumption

  • Simple controls


  • It needs a drain for the remains of the condensation, consisting of a single tube

  • The vapor that emerges from the condensation may be visible on certain occasions, therefore the output of gases should be placed where it does not disturb.

Economic assessment

Investment: between 1800€ and 3000€.
Annual economic saving: 0.43€ per constructed m2 and year for systems with radiators; 0.51€ per constructed m2 and year for underfloor heating installations.

Payback time: A minimum of 11.33 years for individual systems. Between 5.06 and 7.73 years for centralized systems.

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