Calentix Energy
Rows of servers inside a modern data centre hall, generating waste heat recovered by Calentix.
For data centre operators

Recover your data centre's waste heat. No investment required.

EU regulation already requires data centres above 1 MW to assess waste heat recovery, and binding reuse targets are on the way. Calentix develops, delivers and operates the recovery system, and the heat is sold to the local district heating network under a long-term agreement. You contribute the heat. We do everything else.

What EU regulation means for your data centre →
Get a free pre-feasibility screeningDownload the free guide
The Calentix model

Calentix is a heat producer. The fuel is your waste heat.

Your data centre already produces heat around the clock, today it is rejected into the atmosphere. Calentix captures it, upgrades it with industrial heat pumps, and sells it to the district heating network. Each project is set up as a dedicated project company that finances and owns the system, with Calentix leading development, delivery and operation. You keep full control of your operations and gain:

  • 01

    Zero capital investment

    Heat pumps, heat exchangers, pipework and controls are financed and owned by the project company. No capex, no balance sheet impact for you.

  • 02

    ERF compliance made simple

    Fully metered, auditable energy data for your annual ERF reporting under the EED and national regulations.

  • 03

    Lower cooling costs, better PUE

    Heat reuse reduces cooling electricity demand, directly improving your PUE metrics.

  • 04

    Verified carbon reduction

    Every MWh of recovered heat displaces fossil heat in the network. Documented for your ESG and Scope 3 reporting.

  • 05

    No impact on uptime

    The system sits on the output side of your cooling infrastructure. Your cooling performance and SLA commitments are never affected.

Rows of servers inside a modern data centre hall, generating waste heat recovered by Calentix.
The deal in practice

What we need from you, and what you get back

We need

  1. 1.A cooling circuit interface, access to your liquid cooling loop, typically 25–35°C, at a defined isolation point.
  2. 2.Physical space, typically 1–4 shipping-container equivalents for the heat pump installation.
  3. 3.An electricity connection, usually 10–20% of the heat pump's thermal output; rarely a limiting factor given your existing infrastructure.
  4. 4.Read-only data access, temperature, flow rate and IT power draw, feeding our monitoring and your ERF calculation.

You get

  1. 1.Audit-ready compliance documentation for EED and national submissions (e.g. EnEfG/BfEE in Germany).
  2. 2.A stronger licence to operate, data centres that supply heat are seen as community assets, strengthening planning positions in urban locations.
  3. 3.A long-term, bankable structure, contracts run 15 years or more and are designed to withstand market and regulatory change.
  4. 4.One partner for everything, we handle engineering, permits, operations and the commercial relationship with the district heating company.
Process & timeline

From first conversation to operational system

  1. 01

    Pre-feasibility

    2–4 weeks

    Initial screening of IT load, cooling configuration and district heating proximity. No commitment.

  2. 02

    Feasibility study

    8–16 weeks

    Technical and commercial analysis. In parallel, we engage the district heating operator.

  3. 03

    Agreements & investment decision

    8–12 weeks

    Site agreement, Heat Purchase Agreement, permits and project financing are finalised, leading to the final investment decision.

  4. 04

    Construction & commissioning

    12–24 months

    Installation, integration and testing with minimal disruption to your operations.

  5. 05

    Operations

    15+ years

    Calentix runs the system. You get ERF performance and ESG credentials without ongoing involvement.

1–20 MWth
Typical project heat capacity
18–36 months
First conversation to first heat delivery
COP 3.5–6
Heat pump coefficient of performance
€0
Capital required from the data centre
Data centres FAQ

Frequently asked questions

The best candidates have liquid cooling (direct liquid cooling, rear-door heat exchangers or closed-loop cooling towers), cooling water at 25–35°C, an IT load above 2–5 MW, and are within 1–2 km of a district heating network. Smaller or borderline sites can sometimes be clustered or phased, we are happy to screen them.

A metric under EU Delegated Regulation 2024/1364 measuring the share of a data centre's energy that is recovered and reused. An ERF of 0.20 means 20% of energy input is reused as heat. In the first EU reporting round (2024 data), only about 1.8% of the heat generated by data centres was reused (European Commission, COM(2026) 500).

No. The system captures heat your cooling system has already rejected and is validated against your cooling requirements before installation. SLA commitments are unaffected.

Each project is financed in a dedicated project company, arranged by Calentix with debt, grants and investor equity. The project company owns the equipment and recovers the investment through the Heat Purchase Agreement with the district heating operator. Zero capex for you.

Yes. Systems are designed for modular scalability, additional heat pump capacity can be added as your IT load grows.

Germany's EnEfG sets binding efficiency and heat reuse requirements, and the Wärmeplanungsgesetz requires municipalities above 100,000 inhabitants to publish heat transition plans, creating both compliance pressure and municipal demand for data centre heat.

Three things: IT load (current and projected), cooling configuration and set-point temperatures, and your location. From that we deliver a pre-feasibility screening within 2–4 weeks, with no commitment.

Find out if your site qualifies

Get a free pre-feasibility screening