Cooling

Heat reuse

Return water at 45 to 65 deg C can pre-heat buildings, pools or processes directly. District heating usually wants 60 to 90 deg C, which takes a heat pump. Germany's Energy Efficiency Act is the sharpest rule in Europe: new data centres from July 2026 must reuse a rising share of their energy.

Source: https://mgrid.org/2025/11/07/germany-enefg-pue-1-2-waste-heat-data-centers-july-2026/ Checked 2026-09-18

the topic source was opened on 2026-09-18 and carries the German reuse targets and the heat-pump temperature gap; it is a summary of the statute, not the statute text