Non-existent customer service
The customer service might very well be non-existent. Contact is only possible via a web-form, no hotline etc.. You get an automated confirmation that your issue will be processed "as soon as possible" but that is it. Over two weeks and three service tickets later I still have no reply. I was asked to pay part of the bill in the advance, and - despite having done that over a week ago - just got a "reminder" that I need to pay the bill. Avoid.
Reply from thermondo
Dear Mr. Hekel,
Thank you for your honest feedback. We sincerely regret the difficulties you have experienced with our customer service and that your concerns have not yet been adequately addressed. We take your criticism seriously and are working to improve our service processes.
Best regards,
Your thermondo Team