WHAT WE DO
From potential to operational heat recovery
WHAT WE OFFER
Five things we handle
so you don't have to
Full notification package and waste heat utilisation plan — audit-ready, regulator-facing documents formatted for BfEE and EED submission.
EED & EnEfG compliance documentation
Data centres contributing heat are viewed as community assets by municipalities — significantly strengthening planning positions and licence-to-operate arguments in dense urban locations.
Community value & planning support
Heat reuse reduces cooling electricity demand by 10–15%, directly improving your Power Usage Effectiveness (PUE) metrics — relevant for both EnEfG PUE ≤1.2 target and sustainability reporting.
Reduced cooling costs & improved PUE
Every MWh of recovered heat replaces fossil combustion in district heating. Calentix provides verified documentation for your ESG and Scope 3 reporting.
Verified carbon reduction
Calentix finances, builds and owns the heat-recovery system. You sign a Heat Access Agreement (HAA) — zero capex, zero opex risk, no balance sheet impact.
Zero capital expenditure
PRE-FEASIBILITY ASSESSMENT
We help data center owners reduce energy use, recover excess heat, and strengthen sustainability performance. By integrating efficient heat-recovery systems to your cooling systems we lower operating costs and ensure compliance with EU energy-efficiency requirements. Calentix acts as both advisor and developer, making your energy systems smarter, cleaner, and more profitable.
FEASIBILITY STUDY
We support data center developers and landlords in creating more valuable and compliant sites. By connecting data centers to local district-heating networks, we turn waste heat into a new revenue stream and enhance your license to operate. Calentix designs, builds, and operates energy systems that make your facilities future-proof and attractive for your customers and investors.
PROJECT DEVELOPMENT
Once feasibility is confirmed, we structure the full project: technical design, permitting, contracts, and financing. Calentix acts as an independent heat producer, developing the project under an Independent Heat Produced model in cooperation with data center owners, utilities, and investors.
CONSTRUCTION AND OPERATION
We finance, build, and operate the heat-recovery system. We ensure performance, reliability, and long-term value. Over time, ownership can be structured in different ways depending on partner preferences and investment strategy.
FOR DATA CENTRES OPERATORS
Turn your waste heat liability into an EED compliance asset
EU regulation requires waste heat recovery assessment for data centres above 1 MW. Germany's EnEfG mandates 10% ERF from July 2026. We make compliance straightforward — and make your waste heat valuable.
YOUR OBLIGATIONS
What we need from you — and nothing more
A cooling circuit interface
Access to your liquid cooling circuit — typically a secondary loop at 25–35°C — at a defined isolation point. We design the interface to be non-disruptive to your operations.
Physical space
Typically 1–4 shipping-container equivalents for the heat pump installation. Containerised units available for constrained sites.
Electricity connection
The heat pump requires its own connection — typically 10–20% of the heat pump's thermal output in electrical terms. Given your existing electrical infrastructure, this is rarely a limiting factor.
Read-only data access
Temperature and flow rate in your cooling circuit, plus IT power draw. This feeds our monitoring platform and the ERF calculation — formatted for BfEE submission.
SITE VIABILITY
What makes a good candidate?
Heat pumps require a water-based heat transfer medium. Liquid-cooled facilities
(direct liquid cooling, rear-door heat exchangers, or closed-loop cooling towers) are
the target market. Air-cooled DCs are not currently viable. As liquid cooling adoption
accelerates with AI/GPU workloads, the addressable market is expanding rapidly.The higher the cooling water return temperature, the better the heat pump performs.
A target of 25–35°C is ideal. Facilities below 20°C are significantly harder to make
work economically. This is the single most important technical variable.Facilities with an IT load above 2–5 MW are broadly in scope. Smaller installations can
sometimes be clustered or phased to reach viable scale. We are happy to screen
smaller sites.Projects within 1–2 kilometres of an existing network connection point are most attractive.
Longer distances require proportionally stronger heat volumes to justify the pipe
investment cost.The EnEfG's binding ERF targets and the Wärmeplanungsgesetz (requiring German
municipalities above 100,000 inhabitants to publish heat transition plans by June 2026)
create both regulatory compliance need and explicit municipal demand for DC waste
heat — making German projects exceptionally well-motivated.