Here can you see the simplified diagram The project combines an elder project which was created two years before.  This product is a solution of a complete closed loop temperature control concerning a problem which appears especially at big buildings.  If suddenly, there is a high amount of warm water needed, the challenge is to  deliver all water supplies with warm water of a certain temperature. This is not  very effortless to implement because of long pipelines and because the insulation  of them is not perfect, a part of the heat get lost. If there is no warm water  consumption for a longer period the water is cooling down in the pipes.  Our target is to solve this problem.  Up to now a closed loop control with reference to ours was only possible by using expensive single components. So we will lower the procurement costs.