Who makes heat reuse for AI data centers
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.
Companies on this part (10)
| Company | Role | Ownership | Ticker | Price | 1d | Confidence | Note |
|---|---|---|---|---|---|---|---|
| Alfa Laval | manufacturer | public | ALFA.ST | 540 SEK | -0.2% | inferred | |
| Carrier | manufacturer | public | CARR | 56.24 USD | +0.4% | inferred | |
| Everllence · unit of VW | manufacturer | subsidiary | VOW3.DE* | inferred | |||
| Fortum | manufacturer | public | FORTUM.HE | 23.09 EUR | +0.5% | disclosed | · source |
| Siemens Energy | manufacturer | public | ENR.DE | 119 EUR | -2.0% | inferred | large heat pumps |
| Trane | manufacturer | public | TT | 445 USD | -0.9% | inferred | |
| Danfoss | manufacturer | private | disclosed | · source | |||
| Kelvion | manufacturer | private | disclosed | · source | |||
| Qarnot | manufacturer | private | disclosed | · source | |||
| Vattenfall | manufacturer | state | inferred |
Who competes here
The same table read the other way: every company above competes for heat reuse & district heating interfaces sockets. Confidence tags matter — an inferred placement is a lead, not a confirmed rivalry.
Seen in real machines
heat reuse & district heating interfaces is named in 1 of the rack teardowns and supercomputer breakdowns on this site. Each line below is a piece of that machine. The companies shown are the ones named on that line, not necessarily the maker of this part.
- JUPITER · supercomputer
- Heat reuse and heat rejection (waste water above 40 C piped to Jülich campus buildings; rooftop heat exchangers as backup) — Eviden/Atos, Eiffage
Nearby parts
- Previous in layer: Water treatment, reuse, consumption
- Next in layer: Building management, controls, environmental sensors
- Layer: Layer 6 — Facility cooling & HVAC
From the blog
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- Taiwan, UK expand offshore wind, CCUS energy cooperation — DigiTimes, 2026-10-23Taiwan and the UK increased cooperation on renewable energy sources, including offshore wind and carbon capture, across multiple policy and industry meetings.
- Google supersizes PJM virtual power plant to more than 1 GW — Utility Dive, 2026-10-22Google expanded its participation in the PJM virtual power plant to exceed 1 GW, signaling a major shift for distributed resources in energy markets.
- Virginia governor seeks 6-year rate freeze if Dominion-NextEra merger is approved — Utility Dive, 2026-10-20The governor suggested a rate freeze conditional on the Dominion-NextEra merger and proposed adjustments to Dominion's debt structure.
- UK council launches heat network feasibility study for proposed data centers near Didcot Power Station in Oxfordshire — Data Center Dynamics, 2026-10-16A UK council is commissioning a heat network feasibility study for potential data centers near Didcot Power Station, with results expected next year.
- Waste heat from Goodman data center in Frankfurt, Germany, to power district heating system — Data Center Dynamics, 2026-10-08The data center operator Goodman is utilizing waste heat from its Frankfurt facility to provide thermal energy for a local district heating system.
- Second federal judge overturns $7B Solar for All cancellation by Trump administration — Utility Dive, 2026-09-25A federal judge overturned the cancellation of the $7B Solar for All initiative previously enacted by the Trump administration.
- UK wants more homes heated by waste heat from datacenters — The Register, 2026-09-25The UK plans to finance building and improving heat networks, integrating waste heat from data centers, including hot water transported under the Thames.
- Affordability concerns drive momentum for performance-based ratemaking — Utility Dive, 2026-09-24Michigan is considering utility rate case reforms, which affects how utilities manage power generation and transmission.
- California governor signs seven-bill package targeting data center energy and water use — Data Center Dynamics, 2026-09-23The California governor signed a seven-bill package intended to regulate and mitigate the costs of data center development related to energy and water use.
- NVIDIA Announces DSX Ready Qualification Program for Data Center Power and Cooling Hardware — ServeTheHome, 2026-09-22NVIDIA launched the DSX Ready program, a qualification standard for data center power and cooling hardware used in AI data center construction.
Questions about heat reuse & district heating interfaces
- What are heat reuse & district heating interfaces?
- 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.
- Which companies make heat reuse for AI data centers?
- This catalog lists 10 companies on Heat reuse & district heating interfaces, 6 of them with listed equity: Alfa Laval, Carrier, Everllence, Fortum, Siemens Energy, Trane, Danfoss, Kelvion, Qarnot, Vattenfall.
- How does AI change demand for heat reuse & district heating interfaces?
- 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.
- How reliable are these heat reuse & district heating interfaces supplier placements?
- The 10 placements on this part break down as 4 disclosed, 6 inferred. "disclosed" means the company or a filing says so; "reported" comes from trade press or a reference-design list; "inferred" is a taxonomy lead with no citation yet.
Sources: placements without a source URL come from the taxonomy seed and are tagged accordingly. How this data is built.· Markdown · JSON