Good reasons to use a solar thermal system

With home heating accounting for about 40% of our annual energy consumption, finding ways to conserve precious fossil fuels and substituting with renewable energies whenever possible is key for a sustainable energy policy and our future.

Save energy and money

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 by as much as 60% and reduce your C02 emissions by up to 1 ton/year.

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 of the largest 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.

DHW heating with solar energy offers significant potential for savings

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.


How does solar heating work?

A solar thermal system captures solar radiation through a solar collector. The heat transfer fluid inside the collector heats up and is pumped to a heat exchanger where the absorbed heat is transferred to the domestic hot water or space heating circuit. The cooled heat transfer fluid is pumped back to the collector and the cycle is repeated.

Depending on your current system, there are two primary ways of integrating a solar thermal system:

  • A solar preheat system which feeds preheated hot water from a solar tank into your existing hot water tank.
  • Or a dual-coil single-tank system, where the hot water is heated by both the boiler and the solar collector.
Solar system with dual-coil hot water tank

Solar system with dual-coil domestic hot water tank

The heart of this solution is the dual-coil hot water tank. With sufficient sunlight, the heat transfer fluid located in the solar system heats the water in the DHW tank via the lower coil. When the tank temperature drops due to water extraction, for example when bathing or showering, the boiler will start if required to provide additional heating via the upper coil of the tank.

Solar system for DHW heating and space heating backup

Solar system for DHW heating and space heating support

The heat transfer fluid in the solar panels can be used for both DHW heating as well as auxiliary heating of the space heating circuit. A water storage tank is continuously heated by the solar panels, and this heat is transferred to the space heating circuit via a heat exchanger. The system control checks whether the required room temperature can be achieved. If the temperature is below the set-point, the boiler will also be switched on.