Last updated on April 16, 2025
We can offer Solar Keymark certificated collectors with 5, 10, 20 and 30 tubes.
A water glycol mixture flows through the collectors and serves as a heat transfer medium. This fluid does not freeze up to a certain temperature.
The collectors reach up to 120 °C under optimum sun radiation.
The vacuum tube collectors produce yields even in diffuse sun light. Yields are generated from a sun radiation of 250 Watt.
At the zero point, the efficiency factors are almost equally. More important is a height of the efficiency factor at the operating point. At an average temperature of 80 °C the efficiency factor of flat collectors amount 30 %. The AKOTEC full vacuum tube collectors have with 55 % a significantly higher performance. (Get to know more about this topic in our comparison of the efficiency factors!)
The tubes with one side coating have a performance of 80 Watt (df) and 75 Watt (hp) (data from Narva). In connection with a reflecting area the double coated tubes can generate up to 110 Watt performance.
No, as long as the tube is not damaged it does not lose its vacuum and 25 years of stable energy yields are ensured.
This is ensured by the innovative and robust NARVA glass-to-metal seal, which does not subject the glass to tensile stress. The glass-to-metal connection easily withstands strong axial and transverse forces. The NARVA solution is protected by international patent law.
The absorber sheet is made of copper and coated with titanium nitride oxide. In fact, it consists of multiple layers. For more information, please refer to TINOX energy Cu.
Reflectors are not included in the scope of delivery, as reflection from a white wall, glazed tiled roof, or a zinc sheet roof is already sufficient. The reflector must be provided on-site.
Our solar fluid VT51 contains corrosion inhibitors, which protect the plant. And because our sealing material is tested with that exact antrifreeze mixture, we guarantee a 20 years manufacturer’s warranty when using our solar fluid.
No, it is not possible because the AKOTEC antifreeze fluid is a highly temperature resistant glycol. The entitlement to the warranty would be cancelled when using another fluid.
When operating the collectors with water, the water must be prepared, decalcified and desalinated. Furthermore, a closed circuit must be existent and not an open drain back.
Up to a temperature of -28°C, the heat transfer fluid is liquid. From the freezing point of -35°C, the antifreeze mixture changes to the solid state of aggregation.
An overheating can be avoided through a professional system planning and a sufficiently dimensioned storage tank. We recommend for systems with an irregular heat consumption (regular heat consumption: process heat, pool heating) and especially for private applications the Heat Pipe collectors. They possess an overheating protection, optionally at 100 °C or 160 °C depending on the product version.
Either you choose the Heat Pipe with the automatically shut down function or you have to plan a big dimensioned storage tank for saving the surplus energy.
No, the tubes are coated with a nano powder silicon dioxide and repel dirt.
AKOTEC collectors are hail tested. Please contact your insurance agent.
No, the copper of the manifold may be damaged by chlorine content and corrodes faster. We recommend the use of swimming pool heat exchangers to prevent corrosion.
No, the Heat Pipe collector needs to be assembled between an angle of 5° – 75° and with vertical tubes to ensure that the condensed fluid flows back in the tube. In contrary the Direct Flow collector can be assembled on a flat roof, facade/balcony and elevated. Even the position of the tube is freely selectable.
The Direct Flow collectors are perfectly suitable for balcony and facade mounting because they can be assembled flat on a wall with horizontal tubes. The Heat Pipe collectors can be assembled on a facade/balcony too, but they have to be elevated to an angle between 5° – 75° with vertical tubes.
The flow works despite horizontal mounting because the fluid is pumped through the collector with a pump.
This depends on the flushing and filling pump. We recommend a flushing time of 30 – 45 minutes in a single-family house.
In theory it is sufficient, but on construction site it must be planned 10 ° because the tolerances are larger and with that the 5 ° can be fulfilled.
Direct flow system: It is particularly important to empty the whole system because the tube is tethered wet. Afterwards take off the housing cover and remove the spring clips. Now you can dismount the tube easily. Heat pipe system: Remove the housing and pull the tube 10 cm back. Take out the tube backwards. It is not necessary to empty the system, because the tube is dry tethered.
From the heat generator the flow is always hotter side and the return the colder side. The collector is the heat generator in a solar system. The installation of flow and return is freely selectable.
It consists of a white coated plastic aluminium plate.
The Direct Flow collector is mountable on a flat roof, facade, balcony and elevated. Even the position of the tube is freely selectable.
We recommend the use of Solar-Fermit with hemp to seal the fittings properly. Teflon tape is not suitable, because of the high thermal load.
Yes, we can offer an in-roof solution for our collectors, that are mounted like a roof window.
Please mind a minimum distance of 1m (100cm).
The collector can be perfused with a maximum pressure of 10 Bar.
The sensor must be mounted at the flow.
We recommend the facade mounting.
It is not necessary to mount the air vent on the highest point of the system when the system is filled with a filling pump. The filling pump flushes air inclusions out of the system. We recommend installing air vents on large systems (more than 15 KW/120 tubes). The solar fluid gases a bit out on heating because it can absorb less air in hot state than in a cold state. The air vent is used as an air buffer container and the solar fluid includes the air again in cold state. The air vent must not be provided with automatical air vents.
The acquisition costs naturally depend on the size of the system and the installation costs. However, the following estimates can be used as a guideline: domestic hot water systems starting at €3,000, heating support systems from €8,000, and 100% solar heating from €20,000.
The German Federal Office for Economic Affairs and Export Control (BAFA) offers various subsidy programs for solar thermal systems. Whether for large industrial systems or private use, you can receive subsidies starting at €500. The system must have at least 3 m² of gross collector area and a 50-liter storage tank. Funding is available for hot water generation, heating support, or a combination of both on existing buildings (built before 2009).
The payback period depends on various factors, such as your previous fuel type, location, orientation, system size, etc. You’re welcome to request a personal profitability calculation from us.
No, but for large-scale systems there is innovation funding depending on the size of the system (20 m² – 100 m² gross collector area), ranging from €3,600 to €18,000.
The complete systems offer everything from a single source – from high-quality solar collectors to matching storage tanks. They are perfectly coordinated and easy to install.
Yes, our systems can be easily integrated into existing heating systems and provide additional heating support as well as domestic hot water preparation.
With a solar thermal system, you can reduce your heating costs by up to 50% and save money in the long term.
Thanks to pre-assembled components and clear instructions, installation is straightforward and can be carried out either by professionals or on your own.
Yes, you can benefit from government subsidies covering up to 70% of the investment costs. We are happy to advise you!
The Weiser Protect collector features dry-connected tubes that can be replaced during operation. It also includes integrated overheat protection at 100°C. The Weiser Power collector has directly flowed-through tubes, allowing it to be installed flat against a facade or on a flat roof.
Both collectors are equipped with 360° rotatable tubes.
Yes, all AKOTEC tube collectors can be used for both hot water production and heating support. With AKOTEC tube collectors, 100% solar heating is possible, offering a significant advantage, especially for low-energy and passive houses.
The collectors are designed for quick and easy installation, with flexible mounting options on roofs or facades.
AKOTEC collectors stand out for their high efficiency, durability, and innovative technologies such as integrated overheat protection. Additionally, AKOTEC vacuum collectors are the only ones certified with hail resistance class 4.
The ideal storage size depends on your energy needs. AKOTEC offers storage solutions ranging from 300 to 2,000 liters, ideal for hot water and heating support. We’re happy to provide a personal consultation to determine the right size for you.
AKOTEC offers buffer tanks for heating water, combination tanks for hot water and heating, and specialized storage models for maximum efficiency. Our tanks are versatile and perfectly coordinated.
Our tanks are built to last, with robust construction and long service life. With regular maintenance, AKOTEC storage tanks can last 20 years or more – quality made in Germany.
We recommend having your storage tank checked every two to three years. Regular maintenance ensures optimal performance and extends the lifespan of your AKOTEC tank.
Yes, our tanks can be integrated into existing heating systems. AKOTEC offers solutions that flexibly adapt to your current solar thermal system. Our experts are happy to advise you!
The MEGA Collector is specifically designed for large energy demands. With its high performance and efficiency, it provides reliable heat supply for commercial properties, industrial facilities, and other large-scale systems.
Thanks to its modular design, collector fields can be flexibly expanded to meet the individual requirements of any commercial installation.
With durable materials, high hail resistance, and a lifespan of over 25 years, the MEGA Collector offers long-term reliability and cost savings.
Yes, the MEGA Collector can be seamlessly integrated into existing heating systems and efficiently supports both hot water production and space heating.
Thanks to high-quality materials and precise craftsmanship, maintenance is minimal. Replacement Tubes can be quickly and easily exchanged when needed.
Vacuum tube collectors have a higher efficiency and perform better under diffuse light conditions, making them particularly well-suited for industrial use.
There are various subsidy programs available for solar thermal systems. AKOTEC supports you in selecting and applying for the right funding options.
Our vacuum tube collectors are TÜV tested and known for their longevity, making them ideal for industrial applications.
Vacuum tube collectors offer higher efficiency and better performance at lower temperatures, providing clear benefits for industrial applications.
The ideal storage size depends on your specific heat demand. AKOTEC offers tailored storage solutions for various commercial applications. Our experts are happy to help you determine the right size for your needs.
AKOTEC provides a wide range of storage tanks, including buffer tanks, combination stratified tanks, and foil-clad solar storage tanks. These are available in various sizes and can be individually adapted to your solar system and hot water consumption.
Our storage tanks are known for their high quality and durability. With regular maintenance, they can last for several decades, making them a long-term investment for your business.
To ensure efficient operation, we recommend having our tanks regularly serviced by professionals. This ensures optimal performance and extends the lifespan of your system.
Yes, our storage tanks are designed to be seamlessly integrated into existing heating systems. Our experts will support you with planning and implementation to ensure optimal compatibility.
The Weiser Protect features an integrated physical overheating protection that safeguards the system even at temperatures above 100 °C.
It is ideal for heating support and domestic hot water generation in buildings with fluctuating heat demand, both residential and commercial.
Thanks to its robust glass-to-metal seal and weather-resistant nano-coating, it offers a lifespan of over 25 years.
Yes, it is especially installation-friendly due to its quick-connect fittings and can be flexibly adjusted to various roof inclinations.
Through efficient energy conversion and high performance, it reduces CO₂ emissions and actively contributes to climate protection.
The Weiser Power uses an innovative direct flow system that is highly efficient and optimized for maximum energy yield.
It is ideal for buildings with high heat demand, such as multi-family homes or commercial facilities, and offers flexible adaptability.
The tubes can be rotated 360° and aligned perfectly with the sun – for maximum efficiency.
High-quality coatings and robust glass-to-metal seals guarantee a service life of over 25 years.
Thanks to its modular design and quick-connect fittings, it is easy to install and low maintenance.
A sign of a defective vacuum tube is the absence of the silver coating at the base of the tube, indicating air has entered.
Yes, with AKOTEC you can replace defective tubes individually without having to replace the entire solar system.
Our replacement tubes fit our system and those of most other manufacturers.
AKOTEC offers a 20-year manufacturer’s warranty on all full vacuum tube collectors.
If you’re unsure whether the AKOTEC replacement tubes are suitable for your solar system, you can receive free advice.
Yes, our accessories are compatible with existing solar systems and ideal for retrofits or optimizations.
Our accessories are durable, efficient, and specifically designed for maximum performance and long service life.
Yes, our accessories are highly versatile and meet the requirements of both residential and commercial applications.
AKOTEC provides high-quality accessories such as mounting systems, heat transfer fluids, and control units – perfectly matched to our solar thermal systems.
Absolutely! Our team of experts is happy to help you find the right accessories for your specific requirements.
Installation requirements:
Operating system required: Windows
Installation steps:
Request the download link
Click the link sent via email and download the installation file
Unzip the archive and save it to the PC where the Easy System Planner will be installed
Run the file setup.exe (Note: Administrator rights are required!)
Accept any security warnings indicating that the program was downloaded from the internet, if necessary
Important:
If an earlier version of the Easy System Planner is already installed, it must first be uninstalled via Control Panel → Programs and Features
You’ll enter basic data such as roof size, orientation, pitch, and your heat demand. The tool checks your inputs and generates a customized planning result.
The tool delivers a complete overview of the required components, system sizing, and suitable AKOTEC products – perfectly prepared for implementation with our team.
Yes, the Easy System Planner is flexible and suitable for both residential and commercial customers. It accounts for individual requirements across various use cases.
No, the Easy System Planner is completely free of charge. You can download it and start planning right away with no obligations.
With our program, you can introduce friends or acquaintances to AKOTEC. After your referral leads to a successful purchase of an AKOTEC solar thermal system, you’ll receive a reward of €30 per m² of collector area.
You’ll receive €30 per m² of collector area for the AKOTEC solar thermal system purchased – quickly and hassle-free.
You need to complete the “Refer a Friend” form in full and ensure that your acquaintance purchases an AKOTEC solar thermal system.
Once your referral’s order has been successfully processed and paid for, your reward will be issued.
Yes, our team of experts is happy to provide individual advice on solar thermal systems and solar collectors.
You are welcome to schedule an appointment at our location to discuss your questions and requirements in person.
Our consultants support you in finding the optimal solution for your needs – from planning to installation.
We strive to respond to your inquiry within 1–2 business days.
Both systems use solar energy. Solar thermal is ideal for generating heat, while photovoltaics produce electricity. The right choice depends on your goals—often, a combination of both technologies offers the best overall solution.
Solar thermal works year-round. With proper planning—collector surface area, orientation, and storage size—your system remains efficient, even in winter.
You can save up to 50% on your energy costs with our solar thermal systems. The exact savings potential depends on several factors such as system size, energy demand, solar exposure, and more.
A modern overheat protection system safeguards your solar thermal installation from damage, ensures consistent efficiency, and maximizes its lifespan.
The choice between a solar thermal system and a photovoltaic (PV) system depends on your individual needs and priorities. Solar thermal is ideal if your primary goal is to generate hot water and heating energy. Photovoltaics, on the other hand, are better suited for producing electricity to power your home or feed into the grid.
A combination of both systems is also possible and can be the best option depending on your energy needs and site conditions. Our experts are happy to advise you on finding the optimal solution for your situation.
The effectiveness of solar thermal systems in winter depends on several factors. Although sunlight is reduced during the colder months, a solar thermal system can still generate enough heat to supply warm water and contribute to space heating.
Proper system planning is crucial, with the collector and storage tank size tailored to meet your heating requirements. Compared to photovoltaics, solar thermal energy remains more efficient for heat generation in winter.
Solar thermal systems are extremely efficient during summer due to high solar radiation levels. Collectors can generate large amounts of energy for hot water and heating support.
When designing the system, it’s important to ensure that overheating is avoided if no heat is being drawn. Ideally, collectors or tubes include an integrated overheat protection mechanism.
A solar thermal system harnesses solar energy to generate heat. In the event of a power outage, the system still produces heat energy, as it functions independently of the power grid.
However, the circulation pump requires electricity to move the heat transfer fluid through the system. If the power goes out, the pump can no longer operate, and the heat won’t be transported. To prevent this, the solar station can be connected to a backup power source. Your trusted electrician can advise on the best solution.
By installing a solar thermal system, you can save up to 50% of your energy costs for domestic hot water and heating. The exact savings depend on several factors, including the size of the system, your energy needs, solar radiation at your location, and your consumption habits. Given these high potential savings, investing in solar thermal energy is well worth it in the long run.
Yes, solar thermal and photovoltaic systems can be combined in one setup, often referred to as a hybrid solar system. While photovoltaics convert solar energy into electricity, solar thermal systems use it to produce heat for domestic water and heating.
Combining both technologies allows you to benefit from the strengths of each, increasing the overall energy yield and system efficiency. However, installing a hybrid system is typically more expensive than a single-technology setup. If you’re interested in a solar thermal system, we’ll be happy to advise you on the available options and costs.
Depending on the intended use, around 3 m² of collector area is sufficient for domestic hot water, and approximately 8 m² is needed to support heating. Ideally, your exact energy needs should be calculated to size the system properly — ensuring maximum yield during the transitional seasons and even in winter.
Absolutely! Photovoltaics are still a smart investment. By using solar power, you reduce your electricity bills and support environmental protection. Ultimately, your specific needs will determine which system is right for you — and both technologies certainly have their place.
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