Summary
The U.S. Department of State (US Embassy Berlin) solicits replacement of two existing boiler systems with a modern Vaillant ecoVIT VKK 226/4 gas condensing unit featuring integrated hot water preparation. Work includes safe deinstallation and disposal of the old boilers and associated electrical systems, removal of redundant gas connections, assessment of chimney liners for code compliance, and installation of safety and control components; the installation must comply with applicable German technical codes (DIN, TRGI, VDE) and be coordinated with the district chimney sweeper. A mandatory site visit is required prior to quotation and inquiries should be sent to BerlinEinkauf@state.gov.