Data centers dump megawatts of heat into the atmosphere. Buildings burn gas to stay warm. greenHeat puts a nano data center in the basement — and makes the heating bill disappear.
The greenHeat UNDC fits in any technical room. 5–50 kW IT load. Installed in under a day by standard HVAC contractors.
Direct liquid cooling captures 70–85% of server waste heat at 55–65°C — sufficient for heating and hot water in virtually any building.
BACnet/OPC-UA gateway, quick-connect couplings, ≤35 dB(A). Indistinguishable from a heat pump. Classified as a heating system — not a data center.
Winter: waste heat feeds the heating circuit. Summer: an absorption chiller converts the same heat into cooling for pools, clinics, and offices.
Simultaneously optimizes SLA, electricity prices, heat demand, and CO₂ intensity in 15-minute intervals — fully automated.
IaaS, CDN caching, AI inference in the city. <5 ms latency, EU GDPR-compliant. A second revenue stream on top of the heat.
greenHeat finances, installs, and operates. Building owners receive heat cheaper than district heating plus rental income — zero investment.
greenHeat operates under energy utility law — not data center regulation. This unlocks the full subsidy framework as a structural cost advantage.
65% renewable mandatory for new heating. Server waste heat qualifies.
Data centers must utilize waste heat. UNDC complies by design — unlocks 30–40% BEW grants.
CO₂ pricing €100–250/t for buildings. greenHeat eliminates owners' carbon costs permanently.
AI inference needs <5 ms latency. Only urban deployment achieves this. Every city is a potential site.
27% of revenue from non-compute sources — cash-flow positive even at 0% compute utilization.
10–15 year contract. Stable, recurring revenue independent of IT cycles. Positive cash flow even at zero compute load.
IaaS, CDN, AI inference at <5 ms. EU GDPR-compliant. Amplifies returns — not required for base profitability.
€250/month to the building owner per 10–15 m² room. Long-term partner alignment built into the model.
Controllable load for virtual power plants (FCR/aFRR). Year-round additional revenue, fully automated.
Heata, Qarnot, and Cloud&Heat have proven the concept. greenHeat combines the smallest form factor, year-round cooling, and a utility-native ESCO model — all in one module.
| Provider | Form Factor | Waste Heat >90% | Summer Cooling | Zero CapEx | Utility Model | <5 ms Edge |
|---|---|---|---|---|---|---|
| Cloud&Heat (DE) | 100–500 kW | ✓ | — | — | — | Partial |
| Heata (UK) | Single boiler | Partial | — | ✓ | — | — |
| Qarnot (FR) | Radiator-size | Partial | — | ✓ | — | — |
| Vapor IO (USA) | 30–150 kW | — | — | — | — | ✓ |
| greenHeat UNDC | 5–50 kW, from 5 m² | ✓ | ✓ | ✓ | ✓ | ✓ |
We're raising a €500K seed round in March 2026. The deck is meant for investors, strategic partners, and selected infrastructure stakeholders.
Use the form to request the deck. We normally respond within 24 hours.
Founder & CEO · hilmar@greenheat.tech