Part of the day: Heat reuse & district heating interfaces

Assembled by the nightly build from this catalog’s own entry for Heat reuse & district heating interfaces (6.07, Layer 6 — Facility cooling & HVAC). The tables below are rebuilt every night; published 2026-10-21.

Heat exchangers and interconnection equipment that export waste heat from a data center’s cooling loop into a district heating network or other end use instead of rejecting it to atmosphere.

Taps the facility water loop (6.05) — typically its warmer, IT-heat-carrying side — and routes it through a heat exchanger, and where the reuse temperature needs boosting, a large heat pump, into a district heating network or process-heat customer, displacing some of the heat-rejection equipment (6.02) a site would otherwise need. Adoption is concentrated where district heating networks already exist and local economics or regulation favor it, so it remains a minority design choice rather than a default. Higher-temperature liquid-cooling loops in AI racks produce warmer reject water than legacy air-cooled facilities, which is exactly the direction that makes heat reuse more thermodynamically attractive, since a heat pump has less work to do raising an already-warm source to district-heating temperature. Investors should treat this as a niche but growing interconnection market tied to specific geographies with district heating infrastructure, not a broad-based demand driver across the layer.

AI delta: Liquid-cooled AI racks run their facility loop hotter than legacy air-cooled halls, producing waste heat closer to the temperature district heating networks need and lowering the heat-pump work required to reuse it.

Who makes it

The full entry — sub-categories, news, videos and sources — lives on the Heat reuse & district heating interfaces page.