In order to cover the demand for DHW in case of a long-lasting lack of sunshine, it is necessary to combine solar heating with some traditional way of water heating. The most advantageous method is inserting a solar tank before the existing system of water heating, utilizing thus the maximum energy from the sun with minimum demand for water heating control and maintaining a comfort supply of hot water. Water afterheating can also be done directly in the solar tank; an electric heating rod with a thermostat can be inserted into any of the solar tanks offered by us. A central heating boiler can be used for afterheating twin-coil tanks or combination tanks.
Using a thermostatic mixing valve at the hot water outlet is recommended, enabling to set a maximum desired temperature of outgoing hot water. In public buildings its use is obligatory.
When properly sized, the solar system can supply solar energy also for additional heating in low-temperature heating systems, preferably in low-energy houses. Especially in these cases, an advantageous combination with summer pool heating is a good choice. This leaflet shows examples of several possible solutions how to utilize solar energy, of course many other combinations and connections can be created.