Flat-plate collectors, STI, collectors, Made in Germany, solar thermal energy

STI, Taru, WRU L, WRU XL, WRU DUO inverter shelters

SolBox with controller and pump, drainage system, DrainBack

Glycol, controller, pump, expansion tank, Sorel, Resol, Wilo, Tyfocor, Varem

Solar panels, storage systems, inverters, balcony solar power systems, anchors

Installation of solar thermal collectors on pitched or flat roofs

Use solar energy intelligently | With STI Solar by your side

At STI Solar, everything revolves around one thing: your energy future.
For over 15 years, we have been developing and manufacturing high-performance solar thermal systems in Germany that deliver sustainable energy for your home. Our collectors combine quality, efficiency, and durability – whether on the roof, balcony, or in the garden.

When it comes to photovoltaics, we focus on excellent value for money.

Whether you own your home or rent it out, our customized solutions make you more independent from the energy market and allow you to invest in a clean, secure future. Our innovative hybrid collectors combine the power of the sun and technology – for maximum yield and efficiency in the smallest possible space.

STI Solar means:
✔ Reliable technology | Made in Germany
✔ Personal consultation & customized solutions
✔ Sustainable energy – today and tomorrow

👉 Let's rethink your energy together.
Get a free consultation now. Contact us by email or WhatsApp.

Étienne Sauppe, Managing Director

Our company

Future-oriented solar thermal* and photovoltaic solutions | *Made in Germany | For homeowners, landlords and visionaries.

For more than 15 years, STI has been manufacturing high-quality solar thermal collectors in Saxony. Thanks to automated production and state-of-the-art manufacturing processes, we produce collectors that meet the highest quality standards.

2003	Founding of Solar-Technologie-International GmbH
2004	Start of collector production in Crimmitschau
2006	Relocation to the current, larger production site in Meerane
2007	Development of the first generation of system protection (drainage systems)
2010	Installation of the first hybrid collector field (solar thermal combined with photovoltaics)
2012	Collector optimization – FKF Series
2016	integrated roof window
2018	certified heat pump collector
2023	start of inverter housing production

Collector manufacturing on approx. 3,000 m² production area
Training and innovation center
Indoor test bench
Extensive machinery
Simulation/design software

Company headquarters Administration building STI

Products and service

Products | Our solutions for your energy future

Your home deserves the best energy source

Our solar thermal and photovoltaic solutions stand for maximum efficiency, flexible installation options, and long-lasting quality. From the high-performance FKF flat-plate collector to the alpine specialist Aldo+ and the compact FINO, we offer you tailor-made systems for every requirement. Discover our innovative hybrid collectors, which combine solar thermal and photovoltaics in a single module – for maximum solar power in the smallest space. Find your perfect product in the Solar thermal and/or Photovoltaics categories.

Advantages | Why STI Solar

More than energy | An Investment in Your Future

With STI Solar, you're choosing quality "Made in Germany," over 15 years of experience, and a passion for making sustainable energy accessible to everyone.
Our systems help you reduce energy costs, protect the environment, and increase your independence – day after day.

Your advantages at a glance:
✔ High efficiency and long lifespan
✔ Flexible solutions for every property
✔ Personal consultation and all-round service
✔ Sustainable production in Germany

Service | Your project in the best hands

We accompany you from idea to implementation

At STI Solar, you are our focus. Our experienced team supports you from the initial consultation through planning to installation – reliably, competently, and personally.
We listen, understand your needs, and together we find the perfect energy solution for your home or property.

👉 Now secure personal advice.

FAQ | Your Questions | Our Answers

Everything you want to know about solar energy. What is the difference between solar thermal and photovoltaics? Solar thermal uses solar energy to heat water and heating systems | Photovoltaics converts sunlight directly into electricity. How long does a solar system from STI Solar last? Our collectors are designed for maximum durability. You can expect a lifespan of 20 years or more.

Can I install my system myself?
Many of our systems are designed for easy installation | however, we are happy to support you with our experienced team of experts and/or, if necessary, certified partners.

👉Do you have any further questions? Feel free to ask them via WhatsApp.