This project involves replacing an existing boiler with a modern Vaillant gas condensing unit for a living area of approximately 211 m². The work includes dismantling and disposing of the old system, inspecting the chimney, and installing the new unit per German technical codes. The location for performance of services is specified as Berlin, with coordination required with the local district chimney sweep. No budget amount or submission timeline is mentioned in the description. An on-site inspection prior to bidding is strongly recommended.