Nvidia Warm-Water Cooling Reduces Data Center Facility Water Usage
Nvidia introduced a warm-water cooling system operating at 45°C to 55°C, claiming to eliminate evaporative cooling needs. While it optimizes facility-level water usage, it does not account for indirect water consumption from power generation.
Impact: Medium
Why it matters
Understanding the true resource cost of AI compute helps architects better evaluate vendor sustainability claims and infrastructure overheads.
TL;DR
- 01Closed-loop systems eliminate internal water use for cooling.
- 02Facility-level efficiency ignores the significant water cost of power generation.
- 03Infrastructure sustainability is tied to energy source, not just hardware cooling.
- 04Fossil fuel power plants remain the largest indirect water consumers.
Key facts
- Coolant Input Temperature
- 45°C
- Coolant Output Temperature
- 55°C
- Coal Plant Water Usage
- 2.2 liters/kWh
- Natural Gas Water Usage
- 1.17 liters/kWh
Facility-Level Cooling Innovations
Nvidia’s system utilizes a closed-loop coolant cycle. Because the coolant enters the racks at 45°C and exits at 55°C, the temperature differential is sufficient to reject heat using passive radiators. In optimized environments, this eliminates the need for traditional chillers and fans, which typically account for the bulk of internal data center water usage.
The Hidden Water Footprint
Despite facility-level gains, the data center remains dependent on the electrical grid. Current energy sources include:
- Natural gas plants: 1.17 liters per kWh
- Coal plants: 2.2 liters per kWh
- Hydropower reservoir evaporation: 6.8 liters per kWh
- Wind/Solar: 0.01–0.03 liters per kWh (manufacturing/cleaning)
Infrastructure Outlook
As data centers continue to scale, reliance on fossil fuels—projected to provide over 40% of new electricity for data center demand through 2030—means the total water consumption will likely remain high despite internal cooling efficiency improvements.
✓ When to use
- Designing hyperscale or edge data center facilities
- Assessing hardware sustainability benchmarks
- Planning long-term energy infrastructure needs
What to do today
- Review data center energy procurement strategies.
- Account for indirect water footprints in ESG reporting.
- Evaluate passive cooling potential for future builds.
Sources