Published specifications for Coral Edge, the 12U immersion pod, and Coral OnPrem, the 42U immersion pod. Both ship single-phase immersion cooling today. Configurations are indicative and are confirmed for a specific deployment during an architecture review. Every table on this page is generated from a single specification data file, so a figure is edited in one place and cannot drift between pages.
Every table on this page is generated from a single specification data file, so a figure is edited in one place and cannot drift between pages.
Coral Edge and Coral OnPrem, summary comparison
Coral Edge, 12U
Coral OnPrem, 42U
Thermal architecture
Single-phase immersion
Single-phase immersion, PAO or synthetic dielectric
Internal capacity
12U
42U, up to 42 by 1U servers
Server compatibility
19 inch rack
19 inch rack and 21 inch OCP
Maximum IT load
Approximately 12 kW, set by the 208 V 63 A single-phase supply
200 kW
Heat rejection
20 kW dry cooler plus 7 kW trim chiller, 27 kW combined
Up to 200 kW, oil to air, oil to water or oil to oil
PUE
Not separately published. In dry cooler mode, modelled pod overhead is approximately 2.0 kW against roughly 12 kW IT load
1.05 to 1.15
Infrastructure overhead
See above
Under 6 percent
Pumps
Dual redundant BLDC, 400 W each, up to 280 LPM, PWM speed control
Dual multistage with variable frequency drive, 25 cubic metres per hour, 58 m head
Fluid volume
Confirmed at architecture review
950 to 1,000 litres
Power
Single phase 208 V / 63 A smart PDU, 14 by C13
110 to 240 V input, 50 or 60 Hz, distribution unit at three phase 208 V / 125 A with 32 by C13
Envelope
900 W x 1,150 L x 1,491 H mm
Tank 2,450 x 1,050 x 1,620 mm plus pump box 800 x 1,050 x 1,491.5 mm
Weight
Confirmed at architecture review
1,200 kg dry, approximately 2,200 kg operating
Coral OnPrem, 42U
Mechanical
Mechanical
Parameter
Value
Rack capacity
42U
Rack assembly
2,450 x 1,050 x 1,620 mm
Pump box
800 x 1,050 x 1,491.5 mm
Server compatibility
19 inch rack and 21 inch OCP
Maximum servers
42 by 1U
Tank material
Stainless steel
Internal structure
Powder coated mild steel
Viewing window
Acrylic
Access
Top door and front door
Fluid capacity
950 to 1,000 litres
Dry weight
Approximately 1,200 kg
Operating weight
Approximately 2,200 kg
Coral OnPrem, 42U
Cooling performance
Cooling performance
Parameter
Value
Cooling method
Single-phase immersion
Heat removal modes
Oil to air, oil to water, oil to oil
Heat rejection capacity
Up to 200 kW
Typical operating oil temperature
25 to 35 C
Maximum oil temperature
45 C
Maximum component temperature
55 C
Recommended ambient
Up to 45 C
Cooling fluid
PAO or synthetic dielectric
Fluid compatibility
Fluid agnostic
Fire classification
PAO and synthetic dielectric coolants typically exceed a 200 C flash point and classify as Class IIIB combustible liquids under NFPA 30, meaning a flash point at or above 93 C. Certificate values for the selected fluid are supplied per deployment.
Coral OnPrem, 42U
Coolant distribution unit
Coolant distribution unit
Parameter
Value
Pump arrangement
Dual multistage pumps with variable frequency drive
Flow
25 cubic metres per hour
Head
58 metres
Speed
2,900 rpm
Stages
5
Usable flow range
8 to 23 cubic metres per hour
Usable lift range
68 to 48 metres
Pump efficiency
63.7 percent
Impeller and body
304 stainless
Pressure rating
PN25, maximum operating pressure 25 bar
Medium pH range
5 to 8
Medium temperature range
Ordinary 0 to 66 C, high temperature 0 to 120 C
CDU ambient
Minus 15 to 40 C
Inlet and outlet
DN50
Coral OnPrem, 42U
Motor
Motor
Parameter
Value
Phase
Three-phase
Protection and insulation
IP55, Class F
Motor power
5.5 kW
Power frequency
60 Hz
Rated voltage and current
208 V, 18 A
Efficiency rating
IE2, 87 percent
Rotation
Anticlockwise
Coral OnPrem, 42U
Electrical and power distribution
Electrical and power distribution
Parameter
Value
Input voltage
110 to 240 V
Frequency
50 or 60 Hz
Control supply
24 V DC
Maximum control power load
800 W
Emergency stop
Included
Distribution unit
Three phase, 208 V / 125 A, 32 by C13 outlets, 3P / 125 A hydraulic electromagnetic switch, L1,650 x W110 x H85 mm, vertical mounting
Units per pod
Multiple distribution units per pod depending on configuration, confirmed against the customer's load profile at architecture review
Coral OnPrem, 42U
Controls and safety
Controls and safety
Parameter
Value
Automation
Integrated PLC
Local interface
Dual 42 inch ultra wide displays
Remote monitoring
Modbus TCP/IP
Monitored parameters
Temperature logging, pump health, flow, pressure, oil level
Oil leak detection, emergency stop, high temperature shutdown, low flow protection, over pressure protection, pump redundancy, power failure recovery, door safety interlock, electrical isolation
Coral OnPrem, 42U
Environmental and compliance
Environmental and compliance
Parameter
Value
Operating temperature
Minus 25 C to plus 50 C
Storage temperature
Minus 35 C to 60 C
Relative humidity
5 to 95 percent, non-condensing
Operating altitude
Up to 3,000 metres
Compliance references
IEC 62368-1, ASHRAE TC 9.9 guidelines
Optional certification
CE, UL, CSA
Ingress protection
Indoor enclosures of this class are typically IP20 to IP31; outdoor cooling units typically IP54 or better
Seismic
IBC and ASCE 7 seismic design category C as a baseline target, D where the site requires it
Transport
ISTA 3E or ASTM D4169 assurance level II for palletised capital equipment
Coral OnPrem, 42U
Stated performance
Stated performance
Claim
Value
Maximum IT load
200 kW
Infrastructure overhead
Under 6 percent
Typical PUE
1.05 to 1.15
Cooling energy reduction
Up to 90 percent against an air-cooled baseline
Floor space reduction
Up to 90 percent against an equivalent air-cooled rack deployment
Water consumption reduction
Up to 90 percent against an evaporatively cooled baseline
Standard Configuration
Coral OnPrem, standard and optional
Standard. 42U immersion tank. Dual multistage pumps with variable frequency drive. Heat exchanger. PLC control system. Dual 42 inch displays. Pressure sensors. Temperature sensors. Flow meter. Filtration system. Integrated drain. Cable management. Service platform.
Optional. Rear heat exchanger, dry cooler package, external chiller, free cooling, dual coolant distribution unit. Building management system integration, SNMP monitoring, redundant PLC. Biometric access, network patch panel, IP KVM, custom branding.
Coral Edge, 12U
Mechanical and interfaces
Mechanical and interfaces
Parameter
Value
Equipment
12U immersion cooling pod
Application
Indoor immersion cooling platform for IT equipment
Cooling architecture
Single-phase immersion, indoor pod with associated outdoor cooling unit
Fluid interfaces
2 by 1.5 inch pipes, one inlet and one outlet, TC ends per approved drawing
Dimensions
900 W x 1,150 L x 1,491 H mm
Footprint
1.04 square metres
Coral Edge, 12U
Pod electricals
Pod electricals
Parameter
Value
Pod internal peak
800 W
Smart PDU input
Single phase, 208 V / 63 A
Outlets
14 by C13
Main switch
1P / 63 A hydraulic electromagnetic
PDU dimensions
L483 x D220 x H88 mm, black metal shell, self-wiring terminal
Monitoring
Smart sub-monitoring and sub-control
Coral Edge, 12U
Pumping
Pumping
Parameter
Value
Configuration
Dual redundant BLDC pumps
Pump power
400 W each
Flow rate
Up to 280 litres per minute
Speed control
PWM
Operating mode
Alternating, with redundant fault reporting
Coral Edge, 12U
Outdoor cooling unit
Outdoor cooling unit
Parameter
Value
Chiller capacity
7 kW
Chiller supply
208 VAC, three phase, 60 Hz
Chiller maximum load
3.5 kW
Dry cooler rejection
20 kW
Dry cooler maximum load
800 W
Dry cooler coil
Copper coil, 42 x 24 x 4 row
Fans
2 by 450 mm axial
Heater
Inbuilt 3 kW, two wire, for cold-climate start
Ports and finish
1.5 inch inlet and outlet, White RAL 7035
Total maximum connected load
5 kW
Coral Edge, 12U
Controls and communications
Controls and communications
Parameter
Value
Communications link
RS485 between outdoor cooling unit and indoor unit
Monitoring
Smart sub-monitoring and sub-control
Standard Configuration
Coral Edge, standard configuration
12U immersion pod. Smart PDU assembly. Pump set with dual redundant BLDC pumps. Outdoor cooling unit with chiller package. Dry cooler with 1.5 inch ports. RS485 communication link. Fluid interfaces, 2 by 1.5 inch.
Thermal
Thermal specifications, both platforms
Coral Edge and Coral OnPrem both ship single-phase immersion cooling today: sealed dielectric fluid, no fans in the thermal path, dual redundant pumps on both platforms. The Coral OnPrem operating envelope holds oil at 25 to 35 C typical, with a 45 C maximum oil temperature and a 55 C maximum component temperature.
Current NVIDIA rack-scale reference designs specify coolant supply up to 45 C, leaving the compute at approximately 55 C. Designing the Coral secondary loop around that temperature is what makes chiller-free dry heat rejection reachable in most climates, and therefore what makes a near-zero water deployment achievable rather than aspirational. Raising Coral's loop supply temperature toward that band is a stated Gen 2 engineering direction rather than a current specification, and this site says so rather than implying otherwise.
A structured technical conversation about power, thermal capacity, density, jurisdiction and deployment sequencing for a specific site. If the answer is that CoralDC is not the right fit, it says so.
