Stulz UK is the exclusive UK distributor for a wide ranging portfolio of
‘Data Centre Cooling Solutions’ manufactured by Stulz GmbH in Hamburg, Germany.
This includes close control air conditioning, in-line direct rack cooling,
fresh air free-cooling, telecoms cooling, free-cooling chillers and coolant
distribution for high density server rooms. Our focus is on delivering powerful
cooling systems with low energy consumption to ensure the best possible PUE.
Server rooms, data centres, internet hosting and other business critical
electronic environments demand reliable, innovative cooling solutions providing
24/7 operational security. Stulz has designed and manufactures a flexible range
of high quality, powerful, cooling products specifically designed to meet this
demand. Known as CRAC units, Sensible Coolers or Packaged units, they are
available in downflow or upflow configurations and in chilled water, DX
air-cooled, DX water-cooled, glycol free-cooling and fresh air free-cooling designs. With the arrival of blade server technology,
and consequent high density heat loads, Stulz introduced the ‘CyberAir’ close
control air conditioning unit range. The small footprint design incorporates
ultra low energy EC fans with ‘inverter’ speed control technology offering high
capacity output and precise airflow regulation.
Our air-conditioning systems and chillers are keeping sensitive
information and communication technology cool, ensuring maximum availability
with minimum energy consumption in data centres throughout the world.
Stulz UK also offers a full range of service and support resources:
Planning support, site surveys, system configuration and technical
Energy efficiency and carbon footprint calculations
Full load witness testing in Hamburg Test Facility
Installation, on-site testing and commissioning services
contracts including a 24 hour, 365 day emergency service.
offers the CyberAir3 series in all known cooling configurations including types
A, G, GE, ACW, GCW, CW and CW2 in both upflow and downflow formats.
CyberAir3 precision air-conditioning system with Dynamic Free-cooling (DFC)
conditions the air in medium to large computer and server equipment rooms with
a heat load of over 20 kilowatts. DFC offers energy savings of up to 60 % less than
conventional DX cooling systems.
CyberAir3 is the world’s first precision
air-conditioning system that considers the benefit of seasonally varying
ambient temperatures. It automatically selects the optimal operation mode for
each case. In cool weather, the optional DFC or DFC2 automatic air-conditioning
technology makes use of dynamic or fresh air free-cooling with outside air.
Energy-intensive compressor cooling (DX) is only switched on when absolutely
necessary. For this purpose, all units are equipped with speed-controlled EC
fans and electronic expansion valves.
MiniSpace precision air-conditioning system from STULZ cools small servers and
equipment rooms with a heat load of up to 30 kW.
With MiniSpace, you can keep your computer systems
cool much more precisely, economically, reliably and durably than with
conventional comfort air-conditioning systems. The system works either via a
cooling compressor with air or liquid cooling (DX system), or with chilled
water (CW system). The units require very little floor space, and their compact
size means they can be installed in small or existing server rooms. The units are
available in all common formats including upflow and downflow air delivery.
is an advanced precision A/C unit, which is tailormade for the targeted cooling
of racks. In the CyberRow, innovative air conduction has been enhanced by
state-of-the-art technology, which enhances the performance, flexibility and
efficiency. Fluctuating server rack loads, space restrictions, lack of a raised
floor, existing server technology - these are some of the tricky situations in
everyday practice that the CyberRow has been specially developed to deal with.
is a standalone A/C unit and is installed and operated independently from the
rack. This complete separation of the rack and the A/C unit increases
reliability and provides greater freedom for designing the layout in the data
CyberRow rack cooling systems are suitable for hot-aisle and cold-aisle capture
in open and contained spaces.
is available with 3 sizes (300, 400 & 600mm wide) and 4 different cooling
- System (chilled water cooling)
- System (direct expansion)
- System (direct expansion and plate condenser)
GE - System (direct expansion + indirect free
GE - System (direct expansion + indirect free cooling)
Our Telecom precision air-conditioning systems for base stations are sturdy, compact and efficient, offering years of reliable operation around the clock.
We offer four types of Telecom cooling systems:
1. Split-Air with a cooling capacity of up to 8.4 kilowatts
2. Wall-Air externally mounted system with cooling capacity of up to 21 kilowatts
3. Tel-Air2 internal air conditioning system with cooling capacity of up to 12.5 kilowatts
4. Free-Air free cooling unit which adds economical fresh air free-cooling to existing conventional comfort air conditioning systems
The Split-Air, Wall-Air and Tel-Air2 systems are also available with free cooling.
The 24/7/365 operation of data centres requires reliable, efficient cooling and humidity control to protect sensitive server equipment. The optimum temperature and humidity conditions can be maintained by closed-circuit air-conditioning systems which supply cold air via the raised room floor.
Precision air-conditioning systems that utilise hybrid technology can take advantage of cool outside air, reducing data centre electricity consumption by as much as 40%. Quiet and efficient, they are designed to provide years of reliable, cost-effective operation that will maintain IT availability around the clock.
High density data centres, with multiple blade servers generating a large amount of heat in a small space, can be prone to hotspots that can adversely affect operational reliability. Precision air-conditioning systems that combine liquid cooling and recirculating air can maintain the required room temperature to the specific degree by targeting accumulated heat loads greater than 30 kilowatts with cold water.
The CyberCool Pump & Transfer system maintains separation of the water supply from electrical components by separating the system into two circuits.
The CyberCool Outdoor Chiller supplies chilled water to precision air-conditioning units and can provide up to 235 kilowatts per unit of cooling capacity.
The CyberCool Indoor Data Chiller, with a cooling capacity of up to 100 kilowatts, is a perfect expansion unit for existing systems when targeted direct liquid cooling of hotspots is required.
The reliability, temperature and humidity control requirements of even small server rooms can quickly overwhelm conventional room air-conditioning, potentially adding the cost of failed IT equipment to electricity costs that are already high due to inefficient air-conditioning.
Precision air-conditioning systems efficiently regulate both temperature and humidity, and are designed for cost-saving continuous operation over many years.
We offer the Compact and MiniSpace precision air conditioning systems which offer cooling of server rooms with heat loads of up to 18 and 28 kilowatts, respectively.
The CyberAir 2 precision air-conditioning system, with optional Dynamic Free Cooling (DFC) hybrid technology that takes advantage of cool outside air to save energy, is a modular system that can grow with your needs.
The CyberAir 2 is a stand-alone unit that features an intelligent processor and an electronic expansion valve that quickly adjusts to pressure and temperature fluctuations. This high efficiency system consumes up to 60% less electricity than regular precision air-conditioning systems.
The flexible and scalable CyberAir 2 system, with a choice of seven cooling systems, six sizes and multiple equipment options, can be tailored to your specific operational requirements.
The Stulz CyberRow advanced precision air-conditioning unit is a stand-alone component designed for targeted rack cooling. It is available in two sizes, with a choice of four cooling systems:
Direct expansion and plate condenser
Direct expansion with indirect free cooling
The CyberRow features three adjustable and independent EC fans and an EC compressor with a soft start function that offers 50% lower power consumption. Cooling capacity is precise and controlled in a manner of seconds thanks to an electronic expansion valve.
With its compact footprint and universal rack compatibility, the CyberRow is also an ideal solution for optimising cooling in existing buildings.
Water is 3500 times more effective than air for heat conveyance. Our CyberCool chillers and pump stations have been designed for maximum reliability and efficiency in data and medical centres.
We offer a range of CyberCool chillers with cooling capacities from 4 to 1,700 kilowatts. They feature energy efficient EC fans and partial-load mode operation for additional energy savings.
Air-cooled outdoor with free-cooling for up to 40% more efficiency
Air-cooled indoor, split
Stulz CyberCool XT chillers are compact and supplied ready for fast, easy connection with factory presets.