Condensing Boilers Evaluation: Retrofit and New Construction Applications

Dylan Cutler

Research output: NRELTechnical Report


The U.S. Department of Energy's National Renewable Energy Laboratory (NREL) evaluated five condensing boiler plants on behalf of General Services Administration (GSA) Rocky Mountain Region (Region 8). The technology evaluation was carried out through observation, measurement, and verification (OM&V) of the performance of five different condensing boiler installations that had been deployed invarious GSA buildings at the Denver Federal Center (DFC) in Lakewood, Colorado. The condensing boilers retrofits were completed in the summer of 2010. This report evaluates the design characteristics, operational efficiency, and life cycle cost effectiveness of the installations.
Original languageAmerican English
Number of pages61
StatePublished - 2014

NREL Publication Number

  • NREL/TP-7A40-56402


  • boiler retrofit
  • building retrofit
  • buildings
  • condensing boilers
  • Denver Federal Center
  • Department of Energy (DOE)
  • DOE
  • evaluation
  • General Services Administration (GSA)
  • GSA
  • National Renewable Energy Laboratory (NREL)
  • new condensing boiler design
  • NREL


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