The support after completion was poor. No one from Thermondo told me that I had to send the documents for obtaining the grant back to the Erfurt company. A confirmation of the execution should come immediately automatically from Thermondo, I had to request it first which took again. Until then the documents were passed on, it took also again weeks. Who can lay out 14000E just so nearly a whole year. Mr. Stoll told me that I would have to submit the grant myself. But that is not true.
The work of the mechanics however was very goodbeim installation of the new heating.
One should check whether the support of the heating by thermosolar can not be changed
into electric solar with a kind of large immersion heater in the water tank. With the nice weather now, the thermosolar provides a lot of heat, which cannot be used at all. Electric energy that is not used for heating, you could consume yourself in the house or sell. You can't shower all day. Also, a cable would be easier to run than those hoses.
Your technicians should check that out. Also, thermosolar only works in pure sunshine according to my observations, while solar panels still provide electr. energy in less sunshine.
I don't want to accuse anyone, but after demolition of the oil tanks, a small cordless screwdriver and a hammer (handmade by me during my training) were missing from my tools. Despite extensive search, they can not be found...... Also, the people of the oil tanks could not speak much German, fortunately I speak Spanish, so it was possible to communicate. Worked these people also good.
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Translation
Comment from thermondo GmbH: 
Thank you very much for your great evaluation. We are very happy to pass on your appreciative words to the colleagues who were on duty for you.
Many greetings,
Your thermondo team