News & Knowledge


The new way of transport!

Our new colleagues are already hard at work for you. The robots always move the fully stocked shelves to exactly where the goods are needed from the corresponding shelves.


Almost done!

Half-time in dismantling the last high shelf. Now it won't be long before this one has disappeared completely. After that, our robot colleagues have even more space - we can't wait.


The last two high shelfs!

The penultimate high shelf is now completely dismantled and it goes directly on with the last one.

The light at the end of the tunnel is getting closer - Stay up to date with us!


Conversion OEG Logistics – Mr Robot starts working!

Step by step our new robot „colleagues“ asign every shelf its provided place. Just a few days left and first goods in and out will be settled with the autonom logistic system.

We are excited


The first robots are being tested ......

Today 3 of the total of 120 robots were put into operation. His job was to check that all QR code markings fit. The first test has been completed successfully.


Human and robot - together even stronger

In the future Human and robot will work hand in hand at the OEG Logistics at Hessisch Oldendorf. The Transport of all containers will be done by autonomous mobile robots. In more than 2000 storage racks every product comes into one’s own.

The efficiency and occuptional safety will make massive strides and every customer receives his good accurately timed.


Let’s get started – more than 2000 shelves have to be built!

The production line for the construction of 2,000 shelves has been established. In total over 1,000,000 rivets have to be integrated.


Hey Robot - welcome to OEG!

The first "robot-colleagues" for the new logistics have arrived and are trained.


A few more final steps

Now the next storage rack in our warehouse has also been dismantled! At the same time, work on the new logistic has started.


Off we go! High rack no. 3 is on it’s way to being dismantled.

This week the high racks for pallet goods will be dismantled.


70,000 OEG boxes have to go!

70,000 OEG boxes had to be relocated to make room for the new technology.


Optimization of our logistics!

We just started bringing our logistics to a new level! Faster, more reliable and more future orientated! Be a part of the process by following our uploaded pictures and videos to keep you updated. The first high racks have already been built. Be excited regarding what's yet to come in the following weeks!


Invitation to the ISH fair in Frankfurt - 11 till 15 March 2019!

Let’s experience the latest and innovative OEG products together ist the trade fair stand E31 in the new Exhibition Hall 12. See for yourself and learn in a face-to-face meeting more about OEG’s performance level, our products and the service. Take our booth as your starting point for the trade fair visit and get spoilt by our excellent catering - and then off you go!

  • Great variety of food and beverages from 9:00 a.m. till 8:00 p.m. - for you as a customer free, of course!
  • Party on the fair every day from Monday to Wednesday from 6:00 p.m.
  • Thursday from 6:00 p.m. : great stand party with live band and DJ
  • Free access to the OEG lounge
  • NEW! Premiere of the new OEG heat pumps from 9 to 250 kW
  • Also discover a great number of new and interesting OEG products at our exhibition stand

We are looking forward to meeting you in Frankfurt!


Only OEG with A +!

Currently, a market overview of storage has appeared in the new sun, wind and heat. OEG is the only storage producer to offer storage tanks in energy efficiency class A +


All OEG tanks with energy efficiency class A +

From now on, all OEG storage tanks up to 500 liters will be produced in energy efficiency class A +!

Thus, we offer you and your customers the highest energy efficiency class for hot water storage tanks, buffer storage tanks, solar storage tanks, heat pump storage facilities and hygiene storage systems on the market. Take advantage of this competitive advantage and choose quality - Made in Germany with 10 years warranty!


Label printing from the OEG shop

From now on you can print product labels for your warehouse or your vehicles. In the shopping cart, the delivery notes and the orders, you will now find a button labeled "Label printing". Simply select size and code type, then click on "Download". Then simply print out the desired number of labels.


ISH 2017 - the first exhibition storage tank is standing

The first exhibit has found its way to the OEG trade fair stand in Frankfurt: the OEG storage tank with its height of 8.30 meters and a capacity of 40,000 litres is the first exhibit to be set up. We are looking forward to meeting you at the trade fair ... make sure of the quality of OEG storage tanks.


ISH 2017 - preparations are under way

Today the first OEG storage tanks are on their way to the trade fair! Visit us and learn more about the performance of OEG storage tanks. From 14 to 18 March on the ISH trade fair in Frankfurt. Stand F10 in hall 8!


ISH 2017 - from 14 to 18 March 2017

From 14 to 18 March, we warmly welcome you at our stand F10 in Hall 8. Make sure of OEG's performance levels, our products and service in a personal conversation.

  • There will be a large variety of free dishes and beverages,
  • daily exhibition parties from 6 p.m. from Tuesday to Friday (on Thursday with live band),
  • OEG lounge.
  • NEW! Mobile OEG toilet facility with exclusive equipment.

Market overview Storage Tanks

You will find an interesting article about storage tanks in the market overview Storage Tanks 12/2016. Read directly now here


Up to 100% subsidies on OEG solar systems

As of 1st of January 2017 , once again the Dutch government grants 70 million Euros as subsidies for solar systems in the Netherlands. Many OEG solar systems are subsidised with up to 100% by RVO (Rijksdienst voor Ondernemend Nederland)


Heating periodical issue 11/2016

In the heating periodical 11/2016 from page 56, you will find a detailed report about OEG: Fachgroßhändler mit punktgenauer Logistik


Now payments via PayPal

Now you can pay for your orders in the webshop directly with your PayPal account. Simply select PayPal as your payment method in the shopping cart.


OEG goes "Swiss franc"

From now on, all Swiss prices will be displayed in Swiss francs to our Swiss customers. Now you can easily compare your prices. Try it now!


Storage & Solar Technology Seminar 4/16

12 interested specialist craftsmen from the Netherlands visited the OEG at the Lienen production site from Friday to Saturday.

On Friday, the group started in the early afternoon with a tour of the memory production. All important and interesting production steps were explained live: from the automated winding of the stainless steel corrugated pipe and the heat exchangers, through the plasma cutter and welding stations, to the foaming of the high-quality insulation.

Then the solar and storage seminar started. Here, the focus was primarily on the 4flex + ® heatpipe tube and hygiene storage. The demand for solar thermal energy is currently rising strongly due to the promotion of solar systems on the Dutch market. An important topic on this day was the promotion by the RVO and above all the most important quality features of the 4flex tube were discussed in detail. The customers were particularly enthusiastic about the integrated temperature shutdown, the low maintenance and the very easy installation of the 4flex solar systems. With a 20-year warranty on the solar tubes and a 10-year warranty on the OEG storage, the specialist tradesman stands out from the competition in customer talks.

All participants made intensive discussions and after the subsequent dinner they exchanged experiences late into the night.


Storage & Solar Technology Seminar 3/16

14 interested specialist craftsmen from the Netherlands visited the OEG at the Lienen production site from Friday to Saturday.

On Friday, the group started in the early afternoon with a tour of the tank production. All important and interesting production steps were explained live: from the automated winding of the stainless steel corrugated pipe and the heat exchangers, through the plasma cutter and welding stations, to the foaming of the high-quality insulation.

Then the solar and storage seminar started. Here, the focus was primarily on the 4flex + ® heatpipe tube and hygiene tanks. In addition to tips and tricks for installation on site, the most important quality features came up: With a 20-year warranty on the solar tubes and a 10-year warranty on the OEG storage, the specialist tradesman stands out from the competition in customer talks.

All participants made intensive discussions and after the subsequent dinner they exchanged experiences late into the night.


OEG 4flex solar systems TOP

After last year 's OEG - 4plus - packages did a great job, this year we are leading the packs of 4flex tubes. The entire article in the sun, wind & heat can be found here.

Convince your customers of the quality of the OEG solar packages, order a package in March and win one of 3 iPad Pro!


We have tried everything!

Today we got an undeliverable catalog back.

Look at the pictures in the year!

The catalog was on the way for over 10 years before it came back to us!

(the address has been removed from us on the image for privacy reasons)



As of now, you can have your ordered goods shipped to a UPS access point in order to collect them from there conveniently and flexibly. In case your warehouse should not be occupied during the day or the construction site be located far away from your company - no problem! Just choose an access point that is near and collect the shippings from there.


IWO Reader

Experts from commerce and trade can obtain information about oil heating even easier in the future. The Hamburg Institute for Heat and Oil Technology (IWO) offers a new service for this purpose: the IWO Reader. The app for mobile devices with the operating systems Android (Google) and iOS (Apple) - other operating systems (such as Windows mobile) are currently not supported - provides helpful information free of charge. These include, for example, a technical guide to troubleshooting and brochures on the topics heating oil and heating oil tank as well as current studies by the IWO.

The recently published new edition of the textbook "Technische Regeln Ölanlagen" (TRÖl 2.0) can also be read as an eBook with the IWO Reader. Anyone who has bought TRÖl 2.0 as an eBook can download it and unlock it on three mobile devices by purchasing a book code.

Downloading the app is easy: Just open the Google Play Store or the Apple App Store on the appropriate mobile device, type "IWO Reader" in the search and start the installation. Afterwards users can select and download the desired information material and brochures.

In addition, the IWO at continues to provide extensive information about heating with oil.

IWO, 2015

The Reader can be downloaded in Google Play Store or Apple App Store.


TRÖl as a book and eBook

The Institute for Heat and Oil Technology (IWO) published in March a new, completely revised edition of the technical book "Technische Regeln Ölanlagen" (TRÖl). The standard work provides a compilation of the regulations and framework conditions for the installation of oil heating systems and provides all the information needed for the planning, construction, operation, maintenance and filling of an oil plant. Also, the new TRwS 791 "fuel oil consumer equipment" Part 1 is completely reprinted. The 450-page "TRÖl 2.0" is available directly at Brand new: The textbook can also be ordered as an eBook for mobile devices.

Developed with the active participation of all industries, institutions, manufacturers and associations operating around the oil heating, the "TRÖl 2.0" describe the requirements for planning and installation of an oil system - from the filler neck to the exhaust gas outlet. This makes the work indispensable for heating craftsmen, chimney sweeps, tank specialists, planners and vocational school teachers. On the basis of the regulations, an oil system consisting of heating oil tank, oil line, oil device and exhaust system can be professionally installed. Easy to understand graphics and practical examples facilitate the work. Differences in individual federal states are shown in the overview. The appendix also contains background information and complete legal texts. A detailed index helps to look up and ensures quick access.

Also available in digital version

All contents of the "TRÖl 2.0" are now for the first time digitally provided by the IWO as an eBook for mobile devices with the operating systems Android (Google) and iOS (Apple). Thus, the information on a tablet or smartphone at any time quickly to hand, even in the boiler room. The book is available as hardcover edition for 89 euros each, the eBook for 79 euros. In addition, books and eBook bundled can be ordered at a package price of 119 €. More information at


OEG - Up-to-Date online

From now on, every month you will find the current mailing under After a successful login you can browse here and as soon as you have entered the quantities of the products you want to purchase, you can transfer them completely into your shopping basket with just one click. Entering the action code is not required on this website.

Have fun!


Delivery notes and packages

In the item "My account" you can now find "Delivery notes" with all the important informaton. Package tracking is also possible from this outline at any time and with just a few clicks you may order further goods directly from your delivery note.


OEG webshop in Italian now!

In addition to French, Dutch, English and German, you can also browse the OEG online shop in the Italian language now. Have fun!


After the ISH trade fair 2015 ...

Not everybody of the 198,000 visitors to the ISH trade fair 2015 found the OEG exhibition stand, but the visitors' attendance was gigantic, indeed! Whether new customers or long-time business friends - the stream of visitors did not end and the enthusiasm about it can still be felt among all our employees even today. We tremendously enjoyed meeting you all at our stand! Chatting with you, laughing, talking shop or just getting to know one or the other. As the applause is the bread for the artist, your visit was the reward for our work! A BIG THANK YOU to you - hopefully, we will meet again at the next ISH 2017!


The first day of the trade fair is coming to an end

the preparation for the draw is well under way. The catering crew has worked up quite a sweat. We hope you liked it.


Being in full swing ... ISH 2015

Best greetings from the ISH trade fair 2015! The final touches are in full swing to start the ISH trade fair 2015 on time tomorrow morning. We are looking forward to you!


ISH trade fair 2015 from March, 10 until 14 2015

Secure the OEG VIP card for yourself and your employees for the ISH trade fair 2015! Your advantages:

  • crediting of the price for an online ticket upon presentation of the OEG VIP card at the OEG trade fair stand
  • free beverages and food at the OEG trade fair stand
  • admittance to the OEG Lounge
  • admittance to the reception party on Thursday, 2 March 2015

Solar packages

You can easily see the singular items of our solar packages by moving the mouse over the sign for Contents of Package. Alternatively, you can also choose the tab Contents of Package (see Picture 3).


IDS-Connect with the OEG-SHOP

From now on, you can use the IDS Connect interface of your craftsman software in the OEG webshop.

This way, you simply transfer article texts into your offers, the shopping cart into your order system or load your orders directly from the software into the shopping cart of the OEG webshop.

Currently, the following software houses support the IDS Connect interface

The FAQ will help you with the setup


Secure 100 OEG coins now!

Winter time is heating time, and thus high season for the exhaust gas analysis!

A lot of work for you, but the Wöhler A 550 L takes a lot from you! With the exhaust gas meter, you can do your work in a time-saving and yet precise manner. Here are just two of the many benefits

Large CO measuring range up to 35,000 ppm 4 years warranty And best of all: With us the guarantee is not bound to a maintenance contract.

Not enough that you receive the Wöhler A550L at a one-time special price. In our winter campaign, you do not even have to deliver your old device and when you buy the device we write your OEG account the same evening 100 OEG coins well.


What other Christmas present can keep up? This promotion is valid until 31.12.2014.


Learning by doing

How can customer support and advising be improved?

5 OEG sales representatives have got an answer to this question: learning by doing! So the Friday before last they knuckled down and rolled up their sleeves. With an OEG service technician on-site a 4flex® solar system was installed. After a short briefing, it all started with the mounting of rafter anchors and rails on the roof. This was easily done within only a short time and they could begin to mount the 4flex®tubes. After the first tube had been fixed onto the mounting rail with just one screw, the other tubes weighing only 2.2 kg could be rapidly mounted onto the roof with the simple click-fit system - no additional tools neccessary. Now they only had to install the Spirovent solar micro bubble separator, fix the connection sets and connect the corrugated solar pipe. All the roof work was finished then. After a short coffee break, work continued in the attic. The expansion vessel and the solar station were installed and connected with the solar line. After the pre-pressure had been checked and set at 1.2 bar and the collector and tank sensor had been connected, the system could be filled by means of the OEG filling station. Only the adjustment of the OEG controller KS2W was left to be done. All the participants were enthusiastic about how uncomplicated the adjustment of the parameters was. Then the great moment was there - commissioning! All the employees were proud of their first selfmade 4flex® solar power system and they are already looking forward to their next learning-by-doing project.


Order fittings - it is that easy!

Step by step we are going to change our forms for ordering fittings. All the versions will be clearly displayed on one site. Just enter the number of fittings you want and then add all entries to your shopping basket with only one click. Try it out : Pressfitting multi-layer composite pipe


Tank and solar technology - for you to touch

On Saturday, October 18th 2014, a group of 14 customers once again took the opportunity to attend the tank and solar technology seminar at OEG and to witness the company's tank production first hand.

Besides the improved 4flex solar pipes and the thermal management of 4plus collectors, high-quality hygienic storage tanks were very well received by the customers.

After a short "trip" to the webshop, where the seminar participants learnt about tips and tricks, they took a closer look at all production steps from the pipe coil to the completion of the final storage tank. At a leisurely dinner, the day was reflected upon and the group exchanged their experiences.


Rate items and receive OEG coins

As of now, you will receive 1 OEG coin for each of your customer reviews in the OEG shop. Your OEG coins can be converted into product vouchers in your account area using OEG-Coins. This means, for instance: If you write 10 reviews, you will get 10 OEG coins and can convert these into a 10-Euro product voucher afterwards.

Try it!


Order proposal in the OEG online shop!

Your employees should be able to make a reliable pricing statement or delivery statement at the customer site? Your employees should create orders for construction sites and company stocks?

Use the new function of the ordering proposal in the OEG online shop! You can give your employees a special employee-login for this so that they can create order proposals on a gross price basis, which are then displayed in your main account to enable them. Very easy!

And this is how it is done:

Log in Choose 'Contact' under the heading 'My account'. Add an employee and put the tick in 'Create an order proposal'. Assign a user name and password for your employee. Finished!

Then your employee can create order proposals with this access or he can advise the client on site, since the gross prices are displayed without VAT here. Once your employee has created an order proposal, you will find this under the heading My Account - Order Proposals. If necessary, take these in your main cart.


Much simpler with Search History in the OEG online shop

As of now, your recent searches in the OEG shop will be saved, so you can reactivate your recent searches by mouse click.

Try it out!


OEG Hygienic Storage Tanks - why settle for anything less ?

With a 10-year warranty, OEG hygienic storage tanks offer you and your customers the security for a durable product of high quality.

In production, we do not compromise - even the corrugated stainless steel pipe coils are 100% reproducibly manufactured by machines.

Safe drinking water - OEG Hygienic Storage Tanks!


Solar and storage tank seminar with a visit of the production facilities

Early Friday afternoon the group started with a tour of the storage tank production facilities.

All important and interesting production steps were presented live: From the automated wiring of the corrugated stainless steel pipe and the heat exchangers, over plasma cutters and welding stations up to foaming the high-quality insulation.

After that, the solar and storage tank seminar started. The 4flex® heat pipe and hygienic storage tanks were in the centre of interest, of course.

Among lots of tips and tricks for on-site installation, the most important quality features also came up. A 20-year warranty on the solar pipe and a 10-year warranty on OEG's hygienic storage tanks do speak for themselves when craftmen and customers talk.

All the participants contributed their knowledge to the discussions and after the ensuing dinner, experiences were shared until late into the night.


OEG in the latest edition of Sun Wind & Heat

In the latest April edition of the magazine Sun Wind & Heat you will find information on OEG products on the pages 45, 48 and 49. Ranging from solar packages, to storage tank warranty up to the 4flex® heatpipe.


Why does OEG give you a 5-year-warranty against hail?

In extensive tests, the resistance of the OEG solar tube 4flex® has been tested. It has proved to be so robust that we can give a 5-year-warranty against hail.


Browse through catalogues online

Do you enjoy browsing through catalogues?

Then go for it ! Browse through all OEG catalogues just like you do with your usual paper catalogues.

Search for values and numbers, memorize pages, recommend pages or switch to the shop item right away. And you can certainly use it with any IOS-device.

Try out now!


ifh INTHERM in Nuremberg, Germany

Have you planned a visit to the ifh INTHERM in Nuremberg, Germany yet?

Visit our OEG online shop daily! Our Deal of the day will present you a different product with TOP conditions every day of the fair.

Do not miss this opportunity! Wherever you are - on the construction site, at the office or at the fair - order online from anywhere.


Solar piping of the latest generation with a 10-year warranty!

As of now, you can order the solar piping of the latest generation with OEG. Extremely thin, flexible, water-repellent, sound-absorbing and with a high fire protection. How is that possible? The innovative pipe is made of a corrugated double stainless steel pipe with a 5-mm aerogel insulation. With a thermal conductivity Lambda of 0.014 W/(m*K), this nano insulation known from space technology reaches a considerably better insulation than conventional products. As an outer protection, the solar pipe has a protective PVC-layer, which is reinforced by titanium oxide (TiO2). It protects the pipe against weather and environmental influences and provides the highest possible protection against insects, rodents and birds (pick protection).

Offer your customers more!


Are you new or still insecure in the use of the OEG shop?

  • Do you have any questions regarding special functions in the OEG shop?

  • Do you feel insecure handling the webshop orders?

  • Do you need any help with the use of the OEG shop?

Take avantage of the instant help"instant answer to your questions" in the shop on the left side!

Get yourself some help from one of our staff members with the special "advisor mouse". You will see right away where to click or where to enter your inquiry.


Why not just order more!

You just want to order more products ?

In the headpiece of the OEG shop you will find the entry my account and you can call up all of your previous orders. Via details you can see the individual items and reorder each of them with a simple click.

Just give it a try!


Energy promotion program

The energy program - module "market introduction" - has started again. The district government of Arnsberg has the nationwide responsibility for this as a licensing authority. As in previous years, citizens, businesses and companies can submit applications for example for solar collectors and biomass plants, ventilation systems with heat recovery, heat transfer stations for the use of district heating or for combined heat and power plants (CHP).

Demand experienced a veritable boom in the last year of funding. There were a total of approx. 8,800 applications with a total of around 19.2 million euros will be approved. Both citizens and companies take the energy transition more and more into their own hands through the "triad", namely the efficient use of energy, the saving of energy and the generation of renewable energies.



Additional state funding:

The subsidy program grants you:

New buildings (proof that the solar thermal system does not fulfill the requirements of EEWärmeG1, built after 01/01/2009) and existing buildings (year before 01/01/2009) for the installation of a solar thermal system for drinking water heating and heating support a subsidy of 90, - € per square meter of collector surface. This subsidy can be cumulated with the federal market incentive program via the BAFA.


Storage Technology live!

Attend our solar and storage tank seminars!

After a tour around our storage tank production with insights into each of the individual processing steps, we will look at the various fields of application and the different versions of OEG's storage tanks.

After that it is about the technical details of the vacuum heat pipe 4flex® and its advantages.

And if that is not enough for you: Then let us discuss and talk shop together in a comfortable atmosphere with dinner and some drinks in a pleasant company!

Are you interested ? - Then send us an email with the subject line "solar and storage tank seminar" to

We will contact you as soon as there is a place available in one of our seminars.


OEG 4flex® - new reasons daily 8

An important solar tube component is the getter. This is a barium layer which is applied to the internal side of the tube after the vacuum has been created. In this way, the vacuum is additonally protected from air / foreign molecules and a defective tube will be indicated immediately by a white colouration of the getter.

The OEG 4flex® heat pipe solar tube has the largest getter all across the market and a TiNOx coating which is supposed to absorb 96% of the incident solar energy and emits only 4% back to the environment. This is currently the best available coating for solar collectors.

Other solar tubes in the market often only have a small getter of unspecified length and the barium layer is difficult to control.


OEG 4flex® - new reasons daily 7

A temperature difference of 130 K is not unusual with a solar system. Winter nights with temperatures of -30°C and sunny days with collector temperatures of about 100°C mean enormous strain fo a solar collector.

Besides the low-iron soda lime glass and the copper heat pipe, only high-quality materials are used with the OEG 4flex® heat pipe. High-quality EPDM rubber flanges insulate and protect the glass-metal seals.

Other tubes in the market only have thin rubberized end flanges to cover the mechanical glass-metal seal.


OEG 4flex® - new reasons daily 6

The OEG 4flex® heatpipe tube is a hermetically sealed and welded copper pipe within a vacuum. There are no soldered weak points. The connection of the tube with the absorber is by springs.

Other solar tubes in the market have soldered connections within the vacuum, which might lead to weak points with regard to tightness.


OEG 4flex® - new reasons daily 5

With the OEG 4flex® heat pipe, you have high-quality protective EPDM rubber caps at the lower end of the tube. Thanks to these caps, you can place the tube on the ground during the installation of the system and at the same time prepare your work place reasonably.

Other solar tubes in the market do not have this kind of protection.


OEG 4flex® - new reasons daily 4

With the OEG 4flex® heat pipe, high-quality low-iron soda lime glass is exclusively used. These tubes have been manufactured in Europe with a 30-year experience. That is the reason why we are able to give you a 20-year warranty on the vacuum of the tubes.

With other solar tubes in the market, borosilicate glass is used. This might draw helium in case of high temperatures and thus impair the vacuum. Very often, you will also find visible lines from glass processing with air pockets which might lead to a higher fragility.


OEG 4flex® - new reasons daily 3

With the OEG 4flex® heat pipe, the unique temperature limitation in the capacitor switches off at 90°C automatically. Only when the temperature decreases, the generation of energy will be resumed. Thus, all components and the solar fluid is protected.

No other solar tube in the market provides this advantage. They only have empty capacitor heads and no temperature limitation which leads to excessive thermal load in the system and solar fluid.


OEG 4flex® - new reasons daily 2

With the OEG 4flex® heat pipe, the capacitor head is conneced with the tube via a high-quality corrugated stainless steel pipe connection. It intercepts tensions which are created by different temperatures.

Other tubes in the market have rigid connections, which are not able to compensate tensions between glass and capacitor.


OEG 4flex® - new reasons daily

With the OEG 4flex® heat pipe, the tube is completely welded and 100% controlled. Thus, we can achieve a long-lasting vacuum in the heatpipe tube.

Other tubes used in the market have seals with plugs.


Intelligent Solar Technology with OEG 4Flex®

A solar system mainly consists of the following components: collectors, pump group and storage tank. The pump group transports the solar liquid heated by collectors into the storage tank where its water is thus heated up. When the water in the tank has reached its maximum temperature, the pump group switches off and no more heat is taken away from the solar collectors. This is why they usually get so hot. So hot that the solar liquid vapourises in conventional collectors. As a consequence the solar liquid ages rapidly or even gets harmed. Additionally, all the components are afflicted by the high temperatures. In order to protect the solar liquid as well as the components, the 4flex+ tubes provide a patented overheat protection in the capacitor. As soon as the temperature in the capacitor rises up to 90° C, bimetal discs lying on top of each other close a valve that prevents more working fluid from rising from the heat pipe into the capacitor. It also prevents from giving off heat to the solar liquid. Thus it is effectively avoided that the solar liquid vapourises (see right part of the picture). When the storage tank can take up heat again, when the pump group works again, when the solar liquid is recirculated and the temperature in the capacitor drops below 90° C, the bimetal discs open the valve and the system returns to its normal operating state.


SEPA direct debit now available for download

If you would like to pay by direct debit, you will find the current forms for the SEPA direct debit in the Service section under Payment & Shipping. There please click on the download.


4Flex®: Advancement of the OEG tube collector

The OEG heat pipe vacuum tube collector 4flex is one of the most modern solar tubes and satisfies highest demands on efficiency, safety and flexibility.

In the 4flex solar tubes there is a copper absorber in a vacuum glass tube. Due to the vacuum, heat losses are minimized, like in a thermos flask.

At the rear side of the absorber there is copper pipe also placed in a vacuum: the heat pipe. It is filled with a little amount of working fluid. The vacuum inside the heat pipe causes the fluid to vapourise starting from a temperature of 28° C.

With solar radiation, the absorber takes up the energy and warms up. This is when the working fluid in the heat pipe starts to boil and changes from a liquid to a gaseous state. The resulting vapour rises to the top end of the heat pipe into the capacitor. Via the capacitor the heat pipe conveys the heat to the solar liquid and the working fluid condenses again and flows back down through the copper tube. If there is sufficient sun radiation, this cycle is repeated continuously..

The dry connection of the heatpipe tubes in the 4flex headers, the small amount of working fluid and this patented overheat protection ensure a particularly high operating safety of the 4flex. Due to the dry connection, individual tubes can be exchanged if necessary without having to drain the solar liquid from the solar unit. Modern click-fit technology allows fast, easy and flexible one-man assembly. Individual tubes can be plugged together in order to generate solar collectors of a perfectly aligned size.


OEG Storage Tank Technology

With one of the latest state-of-the-art productions, OEG has built an extensive, technically high-quality storage tank portfolio during recent years. You will not only find the storage take you are looking for, but also in the exact size. You can also choose between different colours, like silver, white, blue or red.

And of course: Made in Germany ! With a 10-year warranty !*

*if installation and annual maintenance are carried out by specialized craft businesses. With enamelled storage tanks, the use of a Correx inductive anode is a necessary requirement.


Hygienic Storage Tanks

Fresh and hot water is an essential component of life. Whether used for drinking, cooking, showering or washing your Hands, having unlimited amounts of drinking water at any temperature is one of the main achievements of modern society. It is very often taken for granted that the water quality is hygienically perfect. Conventional drinking water tanks, which store a large quantity of heated water for a long period of time, cannot always fulfill these requirements without exception. Largely dimensioned drinking water tanks with low storage temperatures and a temperature layering are energetically common (e.g. a heating system with heat pump and solar thermal support). These factors, however, add to the formation of a sediment layer at the bottom of the tank, which also presents an ideal breeding ground for bacteria (e.g. legionella).

That is the reason why the freshwater technology applied in hygienic tanks has so many advantages for the hygiene of water.

These hygienic storage tanks meet the latest thermotechnical and water-hygienic requirements. Their construction is fundamentally different from those common, large-volume drinking water storage tanks. With hygienic storage tanks, a built-in corrugated stainless steel pipe separates drinking water from heating water and serves as a powerful heat exchanger at the same time. Thus, all the advantages of a buffer storage tank are combined with those of an instantaneous water heater.

The heating water actually serves as a heat storage tank while the drinking water runs through the corrugated stainless steel pipe only when required and gets heated as a result. In this way, the consumer gets hygienically perfect fresh water at the desired temperature at any time.