Renewal and heritage-compliant refurbishment of the heat-generation centre at the Goethe residential ensemble

Summary

The tender concerns Lot 403 for renewing the central heat-generation system at the Goethe residential ensemble in Weimar, including removal of the existing installation and flue system. The planned solution is a two-gas-boiler condensing cascade with hydrogen-ready capability, system separation, energy-storage charging and a renewed flue system. The estimated total capacity is approximately 400 kW, with operation based on an outdoor-temperature-controlled modulating heat-generation system at a 60/45 °C system temperature difference. The existing two-boiler installation from 1990 must be fully dismantled, including the flue system above the roof. The estimated contract value is EUR 176,000, and the submission deadline is 18 September 2026. Precise participation and compliance requirements were not included in the machine-readable notice and must be checked in the official tender documents.