In many cases it is not only more economic but also more efficient to stop the solar system under high irradiance than to store every single Joule which is not used soon and would get lost in the tank later. Therefore our principal concept is to avoid large storage tanks. This is even more the case where high temperatures are required that are accompanied by higher heat losses of the tank. On the other hand systems with small or without tanks can deliver solar heat much faster under bad irradiation conditions if the heat capacity of a storage tank is not a barrier.

The thermal standstill is a normal thing for water systems. In future the restarting of water systems from the thermal standstill will also be a matter-of-course as soon as heat is needed again. A storage capacity of 0.5 kWh per m2 collector area is transferred on the roof and can be saved with the storage tank. This is about 1/100 of the annual energy harvest or even more. A solar collector system that can be restarted from standstill at any time promises a much higher annual energy harvest than installations which can only leave stagnation by cooling down through natural heat losses.

With these positions Paradigma differs essentially from the official recommendations which are based on the traditional flat plate collector technology.