Water-cooled data center chillers
13 vendors list water-cooled chillers for data centers, and their single units reach 21 MW (Trane), 12.3 MW (Hitachi) and 10.6 MW (Daikin Applied). 11 use oil-free compressors and 11 offer an HFO or natural refrigerant.
| Compressors | Refrigerants | Efficiency (as published) | |||||
|---|---|---|---|---|---|---|---|
| Trane | 4001 | 21,0002 | Oil-free magnetic-bearing centrifugal; centrifugal; variable-speed screw | R-1234ze; R-513A; R-134a; R-1233zd; R-515B | — | GVAF: SEER up to 6.55; seasonal metric, not full-load EER | 2026-11-11 |
| Hitachi Cooling & Heating | — | 12,3102 | Two-stage centrifugal (S, VG); oil-free magnetic-levitation (VM) | R-513A; R-1233zd; R-1234ze; R-134a | — | Announced range: up to 13.8 ACCOP; vendor-specific annual metric | 2026-11-11 |
| Daikin Applied | 3021 | 10,5511 | Variable-volume-ratio screw; Variable-speed oil-free magnetic-bearing | R-1234ze(E); R-515B; R-513A; R-1233zd(E) | 29.41 | Pathfinder AWV: IPLV above 22 EER; Pathfinder AWM: up to 22.7 IEER (US units) | 2026-11-11 |
| Dunham-Bush | 2641 | 10,5501 | Inverter-driven dual-stage, oil-free magnetic-bearing | R-134a; R-513A | — | — | 2026-11-11 |
| Haier | 4401 | 8,7931 | Direct-drive magnetic-bearing centrifugal | R-134a | — | — | 2026-11-11 |
| Vertiv | 3001 | 6,0004 | Inverter screw; oil-free magnetic-levitation centrifugal | R-1234ze; R-513A; R-515B; R-134a | — | — | 2026-11-11 |
| Carrier | 1701 | 3,8001 | Scroll; variable-speed screw; two-stage magnetic-bearing centrifugal | R-513A; R-1234ze(E); R-515B; R-32 | 353 | COP 6.75, IPLV 11.4 under AHRI (AquaEdge 19MV4) | 2026-11-11 |
| Smardt | 2111 | 2,5001 | Oil-free magnetic-bearing | R-513A; R-515B; R-1234ze; R-134a | — | — | 2026-11-11 |
| ENGIE Refrigeration | 2501 | 2,0001 | Oil-free magnetic-bearing | — | — | — | 2026-11-11 |
| STULZ | 2801 | 1,8601 | Screw (stepless or frequency-converter); Turbocor | R-1234ze; R-513A | 251 | — | 2026-11-11 |
| Euroklimat | 1901 | 1,4001 | Oil-free magnetic-levitation Turbocor | R-134a; R-513A; HFO option | — | — | 2026-11-11 |
| Refra | — | 4101 | — | Propane R-290 | — | — | 2026-11-11 |
| HiRef | — | — | Screw | R-513A | — | — | 2026-11-11 |
The lines behind each row
All 32 vendorsHow to read the columns
Methodology- Smallest unit kW
- Lowest published cooling capacity across the chiller lines named in the 'Lines' field, converted from refrigeration tons at 3.517 kW per ton where the vendor publishes tons. Rating conditions differ by vendor and line, so compare ranges, not decimals. Blank when no line states a lower bound.
- Largest unit kW
- Highest published cooling capacity of a single chiller across the lines named in 'Lines', converted from tons at 3.517 kW per ton where needed. Project totals, multi-unit plants and announced-only products are excluded. Blank when not published.
- Compressors
- Compressor technologies in the named lines, as the vendor words them: scroll, screw, centrifugal, magnetic-bearing (oil-free) centrifugal.
- Refrigerants
- Refrigerants the vendor lists for the named lines. A refrigerant may be offered only on some sizes or markets; the record's sources say which.
- Max supply water °C
- Highest chilled-water supply (leaving) temperature the vendor states for a named line. A rating point is not an operating limit and is not used here. Blank when not stated.
- Efficiency (as published)
- Efficiency figures with the metric and conditions the vendor gives (EER, SEER, IPLV, COP). The metrics are not interchangeable: SEER and IPLV are weighted part-load figures, EER and COP are single points.