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Save money with power and heat from free solar energy

At Viessmann, we are committed to designing and developing innovative technology with the future in mind; designing our products with a view to supporting and encouraging the use of sustainable, renewable energy sources. This means that all of our boilers can be complemented with free, natural energy from your home’s solar panels, helping your house to become more environmentally friendly and reducing fuel bills by harnessing the power of the sun.

Solar thermal heating systems

If you are planning to replace your existing boiler and already have solar panels on your home, many of our products are designed to support the use of energy from these to supplement your heating with a completely natural, green energy source; helping to reduce your home’s footprint on the environment and reduce bills.

For those investing in a new heating system today or planning a new build, you should consider designing it from the outset to include a solar thermal system. This will not only allow you to benefit from maximum efficiency and lower energy consumption, but it will also enable you to look forward to lower monthly energy bills. The solar compatible range of Viessmann heating solutions offers everything you need to make your new home as green and future proof as possible.

Viessmann Vitodens, Gas Boiler range

Which heating system is the best for you?

Solar thermal product types

Flat-plate collectors

Our powerful solar flat-plate collectors can save on average up to 60 percent of the energy required each year for DHW heating.

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Tube collectors

Effective use of the sun's energy – with their highly selective coating, the absorbers collect a vast amount of solar energy and thereby ensure high efficiency.

Discover our tube collectors

The Vitosol Family

At Viessmann, we offer a range of tube and flat-plate collector, solar thermal products. Within this range we have the perfect solution for any home.

Not sure which product you need? Use our simple tool.

Design & Technology

The Vitosol family of advanced flat-plate and tube collectors are designed to impress - not just in terms of their  high operational reliability and long service life, but also their stunning appearance. Our advanced solar collectors are made of corrosion and UV resistant materials to protect them from the elements and feature unique technologies to ensure maximum safety and efficiency along with a consistently high thermal output. 

We draw on 30 years of experience in developing and manufacturing our solar collectors, and are proud to have the performance of our solar thermal productsverified by quality testing as per test standard EN 12975 or ISO 9801.

Our solar thermal technology is designed for seamless and straightforward integration with our range of heating and DHW products, allowing you to maximise the savings made and reduce your home's CO2 footprint significantly.

Droplet of water, falling from a tap

Solar water heating systems

Installing a solar powered water heating system in conjunction with a Viessmann boiler system will enable you to utilise the free heat from the sun to warm your domestic hot water, helping to save money on your bills and reduce your home’s CO2 footprint.

A solar hot water heater works by using solar collectors on the roof of your home. The solar collectors will collect heat from the sun and use it to heat up water which is stored in a hot water cylinder. 

A solar hot water heater can either work independently, depending on how much sunlight there is, or it can work in-conjunction with our range of boilers or an immersion heater to heat the water in your home.

By installing solar collectors on your property, you will be sustainably lowering CO2 emissions and demonstrating your commitment to protecting the environment.

Viessmann solar thermal technology

By choosing Viessmann technology for your home, you will be choosing technology which is equipped for the future. All of our boiler systems are compatible with our solar thermal systems, allowing you to utilise the free energy provided by the sun to reduce your energy bills and reduce your dependency on non-renewable energy sources whilst helping to reduce your home’s environmental impact. All of our products are manufactured in Germany to the highest of standards, giving them a reputation for performance, reliability and longevity.

With more than 30 years' experience in the development and manufacture of solar thermal systems, you can count on our high quality technical expertise. Whether you opt for a new condensing boiler for oil or gas, a heating system for wood or a heat pump, all of our systems can be utilised in combination with solar technology.

The potential savings from solar thermal systems


Fuel cost / kWh: £0.167

Boiler efficiency: 100%

Annual savings* : £267


Fuel cost / kWh: £0.47

Boiler efficiency: 90%

Annual savings* : £84


Fuel cost / kWh: £0.057

Boiler efficiency: 90%

Annual savings* : £101


Fuel cost / kWh: £0.042

Boiler efficiency: 90%

Annual savings* : £75

*These potential savings are given only as a guide 
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Our most popular solar thermal products

Vitosol 100-FM
Vitosol 100-FM

A high performance flat-plate collector 

A powerful and attractive flat-plate collector, the perfect addition to any heating system. With an individual absorber area of 2.3 m², Vitosol 100-FM solar collectors can be effectively matched to any energy demand, repla...

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  • Ideal for


  • Suitable for

    Flat roofs

  • Ideal for


  • Central heating


Discover the Vitosol 100-FM

Not sure which product you need? Use our simple tool.