2.2.1 Installation of a condensing boiler
Description
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.
Benefits
Better performance than conventional boilers
Higher rate of modulation
Noiseless
Until 27.5% savings on heating consumption
Simple controls
Limitations
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.
References and best practices
- Condensing boilers evaluation: retrofit and new construction applications:
www.gsa.gov/portal/mediaId/197387/fileName/GPG_Condensing_Boilers_NREL_06-2014.action - Installation of decentralized natural gas condensing boilers at Lagan Valley Hospital, Lisburn:
www.dfpni.gov.uk/good_practice_case_study_no.1.pdf
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CHARACTERIZATION
Environment or playable world:
Residential
Academic
Offices
All
Carried out by:
Public building users
Owners
Operators
All
Reduce consumption of:
Heating
Cooling
DHW
Lighting
Electric devices
Type of driver:
Physical environmental
Contextual
Psychological
Physiological
Social
Time framework:
- Short term
- Long term
Type of measure:
- Envelope
- HVAC
- DHW
- Lighting
- Electrical devices
- Other
