Good reasons to use a solar thermal system

Finding ways to conserve precious fossil fuels and substituting with renewable energies whenever possible is key for a sustainable energy policy and our future. By integrating a high-performance solar thermal system, solar energy is used to heat or preheat your home's domestic hot water (DHW), and in some cases, supplement your space heating. You can offset your DHW heating costs and reduce your C02 emissions significantly.

Tap into clean, sustainable energy

Finite fossil fuel reserves and the dangerous effects of climate change are two of the biggest challenges we face today. With the heating sector as one large consumers of energy, it's time to rethink the way in which we consume energy. As the cleanest, most abundant and easily accessible form of energy on earth, start your sustainable energy approach with solar energy.


How much can I save?

The amount of available solar radiation is dependent on the time of year and your location. The solar coverage rate measures the average amount of energy covered by a solar system in a year. In northern climates, solar coverage can still be as high as 70%. In the summer months a high-performance solar system typically covers almost all the energy required to heat domestic hot water. A solar system can make a real difference. Not just by reducing your energy bill, but by reducing harmful CO2 greenhouse gas emissions as well.

DHW heating and central heating backup with solar energy

Solar thermal systems are the perfect choice for DHW heating and central heating backup. Thanks to freely available solar energy, your investment can be recovered within a few years through savings on fossil fuel.

Generally, you have the option of using solar energy for DHW heating and central heating backup. In any case, savings on oil or gas are considerable, as you will be able to reduce energy consumption, required to heat DHW for your daily needs by 60 percent. If you combine the heating of DHW and heating water, you can save up to 35 percent of the total energy required – every year.


Solar thermal systems with dual mode DHW cylinder

A dual mode DHW cylinder is central to this type of system. When there is sufficient insolation, the heat transfer medium in the solar thermal system heats up the water in the DHW cylinder via the lower indirect coil.

When the temperature drops through hot water being drawn off, such as for a bath or shower, the boiler starts – if necessary – to provide additional heating via the second circuit.


Solar thermal system for DHW heating and central heating backup

The solar medium heated in the solar collectors can be used to bring heating water and DHW up to temperature. For this, the heating circuit, via a heat exchanger, uses the water in the solar cylinder that is continuously heated by the solar collectors. The control unit checks whether the required room temperature can be achieved. The boiler will also start if the temperature is below the set value.

How does solar thermal works?

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How does solar thermal works?
Our expert Carsten Kuhlmann explains how does a solar thermal system works.
Solar thermal Viessmann - In every way future-proof

Viessmann solar collectors – futureproof in every respect

All Viessmann flat-plate and tube collectors are distinguished by their high operational reliability and long service life. Vitosol solar collectors are made of corrosion and UV resistant materials. This is most impressively verified by quality tests according to the EN 12975 test standard, which at the same time confirms the consistently high thermal output.

Viessmann can draw on 30 years of experience in the development and manufacture of solar collectors.