Estonia · First site commissioning 2026
Computing that heats the building it sits in.
HeatLoop installs liquid-cooled GPU racks inside businesses that need heat. Up to 95% of the electricity a rack consumes comes back out as hot water for the host. The compute is sold to AI and rendering customers. One machine, two products — and no heat left to throw away.
How it works
A conventional data centre spends money getting rid of its heat. We put the machine where the heat is already wanted, and sell it.
We install the rack
A liquid-cooled compute rack goes into the host building's plant room or a suitable service space. HeatLoop pays for the hardware, the installation and the heat node. The host provides floor space and a grid connection.
The building takes the heat
Coolant leaves the rack hot and passes through a heat exchanger into the building's existing water circuit. Up to 95% of the electricity the rack draws is recovered as usable heat, metered and billed at a fixed €50/MWh.
We sell the compute
The GPUs are rented for AI training, inference and rendering through compute marketplaces and direct contracts. A share of capacity runs interruptible batch work, which lets the fleet offer flexibility to the Estonian grid.
Why the economics hold
For GPU workloads, electricity is roughly a tenth of gross revenue. That leaves the model resilient to power-price swings — and structurally ahead of a conventional facility, which pays twice: once for the power, again for the cooling that dumps the resulting heat into the air.
Interruptible jobs are scheduled into the cheapest hours. Over Jun 2025 – Jun 2026, the cheapest twelve hours of the Estonian day averaged €49/MWh against a €83/MWh day-ahead average.
Because that load can pause without breaking a customer commitment, the fleet can also sell flexibility into Elering's frequency-reserve markets, which opened to local procurement in February 2025 and are short of exactly this kind of participant.
- Day-ahead electricity, average
- €83/MWh
- Cheapest 12 hours, average
- €49/MWh
- Grid fee
- €42/MWh
- Tallinn district heat
- €77.82/MWh
- FCR capacity
- €62/MW·h
- aFRR capacity, upward
- €44/MW·h
- mFRR capacity, upward
- €25/MW·h
Nord Pool day-ahead and Elering balancing-capacity results, twelve months to June 2026. Prices ex-VAT.
A heat source we pay for
If your building runs on district heating or gas, we install a heat source at our own cost and sell you the output below what you pay today.
See if your building fits →GPU capacity, hosted in the EU
Workstation- and data-centre-class NVIDIA accelerators for training, inference and rendering — inside the EU, on infrastructure that does not burn power on chillers.
Join the pilot waitlist →The model and the numbers
Three revenue lines per rack, built on twelve months of Estonian electricity and balancing-market data. Company details, roadmap and funding position.
Read the company page →Where we are
HeatLoop is early, and privately funded. Nothing below is presented as operating capacity until it is.
- Phase 1 · Aug – Oct 2026
MVP heat node
First host site. Validates the heat loop end to end — capture, transfer and metering into a live building circuit.
- Phase 2 · Nov 2026 – Feb 2027
First production rack
A fully populated ~40 kW rack in commercial operation, selling compute and heat under contract.
- Phase 3 · 2027
Grid services
Interruptible capacity registered into Elering frequency-reserve markets through a licensed balancing-service provider.
- Phase 4 · 2027 – 2028
Pilot line
Multi-site deployment across Estonia, subject to innovation-grant co-funding and a seed round.
Start a conversation
Whether you have a building, a workload, or a question about the model — a direct email is the fastest route to an answer.
info@heatloop.com