"Dear Mr. Wenzel.
First of all I’d like to say hello to you and many thanks for your professional support in the course of building the Roos swimming pool heating system.
Also the delivery was extremely satisfying.
Like your other customers I can also only assure you that the gratis solar heating makes swimming in the pool a pleasure, just as you say in your elaborate documentation.
Thank you once again, and enjoy your holidays.
Best wishes,
The R. family from Austria"