Products heatStixx
heatStixx & heatsel

For effective heat storage

It has never been easier to store ecological heat!

All advantages at a glance

Optimized material properties compared to conventional PCM encapsulations
  • PCM with high cycle stability
  • Flexible - adaptable to almost any storage tank heatStixx/Sel
  • Capacity expansion up to 5-fold
  • Cost saving compared to glycol storage
  • Reduction of operating costs
  • Climate neutral - for a better environment and future
  • Maintenance free
heatStixx for latent storage in cold and heat application
heatStixx - PCM for latent storage in cooling and heating application

Designed for optimum phase change

Our heatStixx and heatSel are designed in such a way that, in addition to a large surface area, the PCM layer thicknesses are kept so small that the entire PCM participates in the phase change process and thus efficient heat transfer (fast charging and discharging) is achieved even at very low temperature differences.

The design as a hybrid heat storage enables the greatest possible dynamics due to the water content and is therefore perfectly suited for a large number of applications in refrigeration, air conditioning and heating technology.

Products heatStixx
heatStixx for latent storage in cold and heat application 2
Products heatStixx
Products heatStixx

heatStixx & heatsel

The innovative solution to increase the storage capacity !


  • Select operating temperature
  • Insert heatStixx
  • Use the latent energy


  • Standard socket 1 ½"
  • Automatic arrangement of ellipsoids
  • Optimized flow through

optimize heat pump

  • Use SmartGrid tariffs
  • Bridging blocking periods
  • Improve efficiencies

system competence

  • Booting function for standard storages
  • Optimization of system storages
  • System sovereignty is retained


  • heat storages
  • cold storages
  • heat pump systems
  • Power-to-Heat Facilities
  • Energy storage of all kinds

features & benefits

  • Maintenance free
  • Flexible
  • high cyclic stability
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This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 778788
Products heatStixx

Increased storage capacity

3-4 times higher with the same volume, simple retrofitting is also possible.

By using our heatStixx and heatSel you can significantly increase the storage capacity of your storage facilities.

Whether in a cold or heat application, the used temperature
spread is decisive. The lower it is, the larger the increase factor becomes.

Our products are therefore ideally suited for achieving a high storage capacity even at low temperature spreads.

Products heatStixx

Reduction of the storage volume

3-4 times with the same capacity, ideal for limited space conditions.

The effect described above allows you to reduce the storage size with the same factor while keeping the storage capacity constant.

Especially when space is limited, you can use it optimally by using heatStixx. At the same time, you benefit from the smaller insertion dimensions of the smaller tank.

Products heatStixx

Increased service life

You benefit twice over! - Peak shifting and extended runtimes.

This not only allows you to reduce the output of your heat generator and significantly reduce your purchase costs, but also significantly increases the operating times and thus the economic efficiency as well as the service life.

Because short running times and high cycle rates reduce the service life and lead to high maintenance costs.

Products heatStixx

Simplified process control

by transforming the temperature peaks to phase change temperature and thus constant injection and withdrawal temperature. An integration as a thermal switch.

Products heatStixx

Reduction of operating costs

Reduce power peaks ( = connected power ) ( Peak-Cutting / Peak-Shifting ), use favourable "night current tariffs" and own production.

The increased storage capacity allows you to benefit in different ways.
Let us take a look at a typical daily load graph of a heat generator:

Products heatStixx

Reduce power peaks ( = connected power ) ( Peak-Cutting / Peak-Shifting ), use favourable "night current tariffs" and own production.

The increased storage capacity allows you to benefit in different ways.
Let us take a look at a typical daily load graph of a heat generator:

This daily load graph shows a typical power requirement over one day.
To cover the highest peaks, you need to install a heat generator that can cover the power peaks.

But at times of lower demand it does not run at full power or starts to clock. The operation can be optimized by using a smaller producer, which increases the full load hours.

However, this is only possible if you can already generate these power peaks at another time.

To do this, you must store the energy so that you can make it available later. This requires a higher storage capacity.

Products heatStixx

Higher efficiency

Increase of the COP (Coefficient of performance) and reduction of heat losses by constant temperature level (operating costs -40 % !), use of smaller cold/heat generators possible.

Products heatStixx

Increase the efficiency of your heat pump.

Your storage temperature remains constant for a longer period if you use heatStixx. So when you charge your storage tank, the storage tank temperature remains significantly lower after the phase change. This is cash money for your heat pump. Because by each higher °C, which this must provide, more energy is needed and that exponentially! This will result in a higher COP and a higher annual performance factor.

This also improves the use of condensing technology. This benefits from a similar effect. This, too, requires the lowest possible application temperature and is therefore only really profitable.

Products heatStixx

Increase your efficiency class - ErP-Label !

No matter whether you reduce the memory size or increase the storage capacity, you benefit in every case.

By reducing the memory size, you can significantly reduce the memory losses due to the reduced surface area. For example, your class B memory (ErP label) becomes class A and saves you money every year.

Even if you keep the same storage size, you benefit. The losses remain the same, but by using heatStixx you achieve a significantly higher storage equivalent, i.e. your label improves!