"Requested Services: Design, Supply and Installation of Heat Production Facilities for the Rehabilitation of District Heating Systems Lot 1: Design, Supply and Installation of Heat Production Facilities for the Rehabilitation of the District Heating Systems of the JKP Toplana Leskovac Lot 2: Design, Supply and Installation of Heat Production Facilities for the Rehabilitation of the District Heating Systems of the JKP Badnjevo Negotin Lot 3: Design, Supply and Installation of Heat Production Facilities for the Rehabilitation of the District Heating Systems of the JKP Gradska Toplana Niš Interested applicants must apply for all three lots, as only one Bidder will be awarded for all lots."