Solar thermal systems are the perfect choice for DHW heating and central heating backup. By harnessing freely available solar energy, you can save on the use of fossil fuels. What's more, investments in solar thermal energy pay off in just a few years.
Fundamentally, you have the option of using solar energy for DHW heating and central heating backup. Savings on oil and gas are considerable in all cases, as you will be able to reduce your annual energy consumption
by around 60 percent. This is the energy that would otherwise be required for your day to day DHW heating. If you combine the heating of DHW and heating water, you will save around 35 percent of the total energy required – every year.
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. If the temperature is below the set value, the boiler will also start.
Solar DHW heating and central heating backup
Solar thermal system with dual mode DHW cylinder
A dual mode DHW cylinder is central to this type of system. When there is sufficient insolation, the solar 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 DHW heating