Mission critical cooling for thermal limits - from one source.
Do you need cooling capacity for your systems? Overcome thermal limits with cooling solutions from COOLTEC and maximise the performance of your technology.





Semiconductor
Precision cooling that makes nanometres possible
In EUV lithography, thermal stability decides results and consistency. We supply cooling solutions for electronic and mechanical components from just 3 cm up to 3 m in length. All with the tightest tolerances - simulated, manufactured and tested in Germany.

Data Center
Direct-to-chip cooling - for tomorrow's AI densities
Heat flux densities are rising faster than racks are growing. Our direct-to-chip (D2C) liquid cold plates - with internal or microchannel structures, milled, joined or printed - take the heat where it belongs: away from the chip.

Aerospace
Every gram counts - and so does every kelvin
For aerospace we develop weight-optimised heat sinks with complete documentation - from the qualified material to the traceable batch. 100 % performance for the applications that really matter.

Defence
Rugged cooling - for the best defence
Defence electronics and mechanics work under shock, vibration and temperature extremes in unpredictable environments. We manufacture the matching cooling solutions in Germany - reliable, discreet, process-safe and tested under extreme conditions.

RF & Microwave
We cool RF & microwave at every conceivable frequency
RF amplifiers and radar modules deliver power on the smallest of areas. We reliably cool GaN and LDMOS electronics, transistors and terminations - for stable signals without derating. We use state-of-the-art manufacturing technologies and performance boosters such as turbulators and heat pipes.

Medtech
Reliable cooling - where technology protects lives
Imaging, lasers and analytics demand quiet, precise and verifiable cooling - documented from simulation to series, from the air-cooled heat sink to the liquid-cooled assembly.

Industrial Automation
Cycle-proof cooling - for 24/7 continuous operation
Drives, inverters and controls run around the clock. Our heat sinks keep them within a safe temperature window - from the extruded profile to the liquid cold plate.

Optics
Thermal stability for the highest resolutions and extreme process windows
Lasers and precision optics drift with every kelvin. Our cooling solutions keep optical systems in thermal equilibrium - for constant beam quality.

Energy
Stable grids need cool electronics - with as little maintenance as possible
HVDC, grid stabilisation and storage systems work at the highest power levels. Our heat sinks keep converters and IGBT modules permanently in the green - designed and tested for low-maintenance operation.

Renewables
Full output from wind and sun - with our cooling it works
Inverters in wind and solar plants run in the open - heat, dust, load cycling. We cool them reliably across their entire service life.

Mobility
Cooling that stands up to the road
Traction inverters, on-board power systems and charging technology work in constant load cycling - with vibration, shock and temperatures from frost to summer heat. We design to the load spectrum of the entire service life.

Machinery & plant engineering
Accuracy stays when the heat goes
In machinery and plants, waste heat arises exactly where it interferes most: at the control system, the drive and the process. If it is not removed, accuracy drops first, then availability.

Trusted by technology leaders:
- ZEISS
- ASML
- TRUMPF
- SIEMENS
- AIRBUS
- RHEINMETALL
- ABB
- GE
- + many more
Everything from one source - from development to series production.
COOLTEC is your one-stop shop for thermal management: one contact, one process, from the first idea to series delivery. You join wherever you stand - development, simulation and design are optional.

- Optional
Development & simulation
We develop, simulate and design your cooling solution - it is tested virtually before we produce it physically.
Manufacturability & cost
You already know what you need? We assess manufacturability and optimise your design for series production.
Samples & prototypes
Samples in around 6-8 weeks as standard, 2-4 weeks by express - depending on product and complexity.
Series production
One-stop shop: highly automated high-tech manufacturing in Germany, low-cost series from Asia.
Supply & lifecycle
Framework contracts, stockholding, last-time buy: we secure your supply across the entire product lifecycle.
Technology updates
What is moving in cooling technology - new manufacturing processes, case studies from practice and insights into our production.

+40 % performance: turbulators now also in heat sinks with press-fitted tubes
What was previously only possible in drawn-in tubes we now supply press-fitted as well: up to 40 % more cooling capacity at an acceptable pressure drop. In the best available materials and mesh structures, stable long term and positioned to the millimetre beneath your hotspots.
Read more –>
Copper inserts as heat spreaders - defusing hotspots precisely
Embedded copper spreaders distribute the heat where the load is locally high. Copper conducts at around 400 W/m·K, roughly twice as well as aluminium - while the base body stays light and economical.
Read more –>
Sebastian Krüger
Bring your thermal challenge - heat load, installation space, medium, ambient conditions. In the first call Sebastian works out the right approaches with you and puts together the team we need for it - from application engineering, production engineering and thermal engineering. No waiting queue.
Our products at a glance



For precise temperature regulation
Liquid cold plates
Maximise the performance of your systems with efficient, compact and powerful liquid cold plates. Benefit from longer service life and stable performance in the most demanding applications.
View liquid coolers –>


For reliable heat dissipation
Air-cooled heat sinks
Avoid overheating and ensure reliable heat dissipation - with the right air-cooled heat sinks from COOLTEC. Explore our range or choose the right model for your application from over 500 standard profiles.
View air coolers –>Frequently asked questions
Does COOLTEC also manufacture single pieces and small series?
Yes, from a single piece. Our everyday work is customer-specific, complex cooling solutions - these almost always begin with one or a few parts and then grow into series production. Cutting a catalogue profile to length, drilling, tapping and anodising is also possible without a minimum quantity. We also manufacture customer-specific cold plates as a single prototype ahead of a series decision. The one thing to know: with single pieces the set-up effort dominates the unit price, so it is not comparable with a series calculation.
Read more –>What drives the price of a heat sink?
Four blocks: material and material form, joining process, machining, and quantity. Quantity has the strongest effect because set-up and programming occur only once. A dedicated extrusion profile additionally requires tooling that only pays off above a certain annual volume - until then an existing profile with machining is cheaper. We state unit prices in the quotation, not on the website: without geometry and quantity any figure would be misleading.
Read more –>What information does COOLTEC need for a sound quotation?
Six things: heat load and distribution of the heat sources, permissible component temperature, coolant with inlet temperature and volume flow, installation space, connection type, quantity. If one of them is missing, the design is an assumption - and assumptions are the most common reason a prototype misses its targets. The fastest route is a technical drawing and 3D model if the design already exists - we then carry out a manufacturability assessment. Otherwise a STEP model of the installation space plus a sketch of the heat sources is enough. With air cooling, add the mounting orientation, the fan and the ambient temperature at the installation point.
Read more –>Air cooling or liquid cooling - which fits?
What matters is not the absolute heat load but the power per unit area and the available installation space. As long as air is sufficient, air is cheaper, needs less maintenance and carries no leak risk - then we recommend air. Liquid cooling becomes the simpler solution when the permissible component temperature is only just above the ambient temperature, when the installation space does not allow fins, or when the device has to stay sealed.
Read more –>Are all liquid coolers leak-tested?
Yes - every liquid cooler is leak-tested before delivery, and the test record is part of the shipment. Depending on the requirement we use a bubble test, pressure-decay test or helium leak test; the latter detects leak rates down to the range of 1·10⁻¹¹ Pa·m³/s. What you should tell us: operating pressure, required test pressure, hold time and permissible leak rate - “tight” without a figure cannot be tested.
Read more –>To which standard is COOLTEC certified?
To DIN EN ISO 9001:2015, certified by TÜV Thüringen, scope: development, production and sale of heat sinks and cold plates plus accessories for the electronics industry. We do not hold industry-specific system certifications such as IATF 16949, EN 9100 or ISO 13485. For industry-specific requirements we supply material and test certificates plus dimensional and leak test records. If your purchasing department requires a particular certification, say so early - then we clarify it before the quotation.
Read more –>Does COOLTEC also take on the thermal design?
Yes - thermal simulation and design are services in their own right, not just an add-on to a manufacturing order. We calculate variants, compare processes and report temperature distribution and pressure drop with the corresponding boundary conditions. It makes sense early, while it is still open whether air or liquid fits. Important, and something we always state: simulation results are calculated values and have to be confirmed by measurement on the real set-up.
Read more –>When is COOLTEC not the right choice?
If you need a catalogue product in high volume at market price, without customer-specific geometry - a mass manufacturer is cheaper there. If your purchasing department requires a system certification we do not hold. If it is about plant engineering rather than component cooling: refrigeration units, dry coolers, building ventilation. And if a component temperature below the coolant temperature is required - that needs refrigeration technology, not a cold plate. In those cases we decline rather than cost you time.
Read more –>How do you design for thermal resistance?
We start from your load case: heat load, distribution across the area, permissible component temperature, inlet temperature, volume flow and installation space. This yields the Rth budget, which we test in thermal simulation (FloEFD) against variants of the channel routing - before design work begins. If it has to be a cold plate with a press-fitted tube, we optimise the design within those limits. If you give us design freedom, the best variant may well be a friction-stir-welded, internally structured cold plate.
How do you handle very high heat flux densities?
With a fine channel structure directly beneath the heat source, 3D-printed cooling channels, or turbulators used selectively in drawn-in or press-fitted tubes. Where necessary with a change of material via heat spreaders or inlays at the interface. The key is to spread the heat flow within the cold plate as well as possible before it enters the coolant - and then remove it from there as fast as possible.
How much do turbulators gain, and what do they cost in pressure drop?
Turbulators significantly increase convective heat transfer - in our applications up to 40 % more cooling capacity. The pressure drop rises with it, which is why we use them selectively: only in the sections beneath the hotspots, not along the entire channel length. That keeps the system pressure drop within your pump's budget while the critical spot gets the additional performance. Available in drawn-in tubes and, more recently, in press-fitted tubes as well.
Do you also develop cooling solutions?
Yes - together with you or independently. With state-of-the-art thermal simulation and over 30 years of experience we meet your specific requirements. You join wherever you stand: development, simulation and design are optional.
In which sizes do you manufacture heat sinks and liquid cold plates?
From a 30 mm microchannel cooler to a 3 m (30,000 mm) cold plate - right up to a fully cooled large precision part. What is possible is not decided by size alone but by material, design and tolerance: give us your dimensions and we will tell you in which design we can produce them.
Which materials do you process, and how do you choose correctly?
Copper, copper-nickel, stainless steel and aluminium - the choice follows three criteria: thermal conductivity, media compatibility and mechanical requirement. We frequently combine: conductive material at the heat source, resistant material at the medium. In doing so we follow our customers' applicable design and release guidelines. On request with coating, anodising and individual marking.
Which cooling solutions do you offer?
A broad portfolio of air and liquid cooling solutions - from classic profile heat sinks to complex, customer-specific liquid-cooled assemblies, matched exactly to your requirements.
Wo produziert COOLTEC?
We produce all high-end cooling solutions in Germany, largely automated and in any quantity. For price-sensitive standard parts we use our production sites in Asia - always agreed transparently with you.
How do you ensure leak tightness?
Pressure testing of every single liquid cold plate is our standard; for demanding applications we additionally test with a helium leak test or a pressure-drop test and document the leak rate per part. We set the target leak rate together during the design process or the manufacturability assessment.
How do you ensure freedom from particles and cleanliness?
We work with defined, documented cleaning processes: multi-stage flushing of the internal channels, controlled drying, residual contamination analysis to an agreed test procedure, and cleanroom-compliant packaging with sealing caps. We design the channel geometry so that no dead volumes arise in which particles or media residues could collect.
What documentation do you supply for qualification?
Material certificates, dimensional reports, pressure and leak test records, plus cleaning and packaging records - to the agreed scope per lot or per part. For initial sample inspections we prepare the documentation to your specification. Exactly what you need is clarified before series start, so that the test steps are planned into the process from the outset.
What is your lead time?
We deliver samples in around 6-8 weeks as standard. With our express option you reduce the lead time to as little as 2 weeks - depending on product and complexity.
What quantities can I buy from you?
Any. Whether a single piece or a large order - we accompany you through the entire product lifecycle, from the first sample to the last-time buy.
Do you also cool mechanical components, not just electronics?
In many projects that is actually the norm. We cool housings and structural parts, optics and mirror mounts, chucks, vacuum chamber components, stators of positioning drives, and process gas. With mechanical parts it is rarely about maximum heat removal alone but about the smallest possible temperature gradient - because the gradient creates the deformation that costs you precision.
Do you work under NDA?
Yes, that is the norm for us. We sign your non-disclosure agreement or provide ours. We never pass on customer projects or application details - and we name references only with explicit approval.

Let's find the perfect cooling solution together - what are you waiting for?
Book a free, no-obligation initial call with our thermal management experts - we reply within one working day.