Siewert & Kau
Siewert & Kau


We are your reliable partner


Our primary business is the distribution of IT products.
Siewert & Kau is an official distributor for many prominent manufacturers and always negotiates good agreements with them on your behalf. That means you save time and money – no lengthy searches and unbeatable prices.

Global procurement with numerous advantages

Our procurement staff remain in constant contact with the manufacturers worldwide. That means we can not only offer products that are available on the market, but also identify new technological developments and include them in our product range at an early stage. We can even offer products with limited availability at optimal prices through our sales organization and “just in time” through our high-performance logistics.

Reliable partner

You can rely on professional consulting from our sales team, fast and reliable service processing and logistical expertise. With the best possible cut-off time, we can also deliver within 24 hours throughout Europe.
Incidentally: if at any time something isn’t right, you can also quickly and easily return a product to us via RMA – we’ll then repair or replace the product as fast as possible.


Constantly changing requirements and trends, new products and fast-evolving markets – the demands placed on IT are challenging and full of growth potential. To leverage that potential, you have to act with focus and speed– and that lies in our DNA: we have an excellent feel for the market thanks to more than 30 years of experience in IT wholesaling. Our qualified employees and specially coordinated sales structure enable fast and consistently tailored support for our partners.

We serve as the fast lane from manufacturers to retailers: our know-how and product depth simply make us faster and more flexible – with unbeatable prices and consistently high availability.

Thanks to our “one face sales” strategy, your Siewert & Kau contact person maintains direct contact with you, knows your concerns and needs, and can thus act quickly, individually and reliably.

The Siewert & Kau pledge:

  • Individual, fast and reliable
  • Optimal availability at all times
  • Unbeatable pricing
  • One face sales strategy
  • Optimized IT logistics
  • Same-day shipping with a very late cut-off


Creating added value, securing competitiveness

In addition to the volume business and our Competence Teams (Value), we offer a comprehensive range of Siewert & Kau-specific service packages – specially tailored to the needs of our customers.
Our range of services includes financial services, value-added service packages in pre-sales and roll-out as well as field services.

As your trusted partner in the highly competitive IT business, we help specifically where our expertise and support are needed. In this way, we ensure the competitiveness of our dealers without competing with the system houses.

The advantages at a glance:

  • Support across the entire supply chain
  • Modular service: We help specifically where we are needed
  • Securing competitiveness
  • Comprehensive know-how and market expertise of contact persons

Financial Services – Alternative financing models

With the right financing strategy, we help you to master the perfect mix between tight investment budgets and increasing requirements. We help you to make optimum use of IT budgets and to find and realise the right financing models. This enables fast and simple processing of even larger projects, minimises payment defaults and offers reporting options that generate further follow-up business – e.g. leasing.

Services: Presale – right from the start

We support our partners even before the project begins and provide advice throughout the conception phase: with a targeted needs analysis, comprehensive advice and a suitable selection of products and manufacturers. You benefit from our know-how and market expertise right from the start – which ensures the joint success of the project.

Services: Rollout – Reliable and flexible support

With our rollout service, we actively support our partners in the implementation of their IT projects – even if they are currently being finalised. If required, we can provide suitable specialists who are available directly on site or remotely and ensure the smooth implementation, installation and commissioning of the IT solution at the customer’s premises.

Services: Field service – customer proximity throughout Germany

With our broad service portfolio and a nationwide technician structure, we also provide support for supra-regional projects throughout Germany. This enables our partners to reduce their fixed costs and comply with agreed service level agreements (SLAs).

For further information & advice, please contact valueadd@siewert-kau.de


Logistics are a core competency for us – that’s why we endeavor to deliver all items ordered by 6 p.m. within 24 hours Europe-wide, provided they are in stock. We meet that goal thanks to close cooperation with reliable transport companies, optimal warehousing and a highly motivated team.

Our own warehouse has an area of several thousand square meters. We permanently list several thousand items for you and can thus quickly and flexibly deliver the desired merchandise. We ship more than 10 million items each year.

Our expertise safeguards high merchandise availability and thus a competitive advantage for our customers. This makes us a strong partner who enjoys rapid growth together with you.

Our range of logistics services:

  • Assembly
  • Labeling
  • Packaging
  • Dropshipping
  • Import (T1)


Benefit from automated electronic business processing that simplifies and accelerates ordering processes. Your existing merchandise management system is connected to our infrastructure through EDI or XML, for example. Our technicians handle the connection so no costs result for you.

We provide you with price and product lists every day for download so that you always maintain an overview of our prices.

Thorsten Müller-Thiel is your contact at Siewert & Kau for all E-Services-related issues.

Thorsten Müller-Thiel

Phone: +49 2271 763 176

E-mail: tmthiel@siewert-kau.de


Defective product? No problem!

Despite comprehensive inspections, problems with individual products can never be ruled out when so many items are shipped.

All items purchased through Siewert & Kau are of course covered by a warranty. You can contact us any time if the manufacturer does not offer direct service handling.

Please first request an RMA (return material authorization) number to ensure optimal processing. This is possible at any time using our RMA online form.

An RMA hotline and e-mail address are available to you. Even if you want to directly contact the manufacturer, our Service Center employees will be pleased to assist you at any time.

What must be observed when returning a product?

  • We only offer free service handling for products purchased through Siewert & Kau.
  • You can also return defective items without previously requesting an RMA number. Simply use the RMA online form for this purpose.
  • We will send an internal RMA processing number to the service e-mail address you have registered with us. This e-mail contains all information for the further processing of complaints


  • Please return your items without packaging and accessories (i.e. bulk), as we otherwise cannot assume responsibility for the completeness of the included accessories
  • Please note that computer hardware is generally impact-sensitive and it is therefore in your own interest to carefully package the return items, as we cannot take back improperly packaged products. Otherwise we will be compelled to return these products to you at your expense.
  • When returning mainboards, please do not use as a shipping box the packaging the product was sold in, as this material is not sufficiently padded and items cannot be safely transported
  • Make sure the RMA number is easily visible on the packaging so that the order can be processed as quickly as possible


  • We ask for your understanding that Siewert & Kau cannot accept non-prepaid shipments.
  • Our service technicians subject all RMA items returned to us to a detailed inspection. If the described defect cannot be identified or the item shows different mechanical damage, we reserve the right to charge a flat rate of € 16.80.
  • In the case of goodwill returns – for example if individual components are incompatible with one another – credits are granted at the maximum current value of the item less a shipping and handling flat fee of € 16.80.