Thermowatt Kft.

Thermowatt Kft. is a Hungarian technology company and Veolia subsidiary with over 17 years of experience specializing in patented wastewater heat recovery systems protected in 37 countries. The Thermowatt system extracts thermal energy from municipal and industrial wastewater through a three-stage process: a reinforced concrete underground filter station removes solid contaminants with automatic backflushing that returns solids to the collection pipe, high-capacity heat exchangers extract thermal energy from the filtered wastewater outside the sewer line, and water-to-water heat pumps deliver the recovered energy for building heating — producing supply temperatures up to 90°C — and cooling. A bypass channel ensures all equipment is installed outside the sewer, keeping the system closed-loop with no emissions or waste. The heat pumps and circulation pumps require refurbishment only every 10 to 15 years. Thermowatt reports 70% cost savings compared to fossil fuel heating and net-zero CO₂ operation, with installation timelines of 6 to 12 months and full integration with existing heating or district heating networks. A 24-hour remote monitoring platform provides real-time operational data and malfunction alerts. Target applications include municipalities, hospitals, universities, data centers, shopping centers, and wastewater treatment plants in cities with at least 100,000 residents. Under the EU RED II Directive, wastewater heat qualifies as renewable energy, making projects eligible for EU financial incentives comparable to solar and wind.