I think you will find Tunze to be one of the best in the business give half a chance. There were problems found with the early design of the nanos which have all since been rectified thru modifications to the design and or materials used to build them.
Where are you located? Warranty service is handled by the distrubutor for the country you live in. In the US it is Tunze USA(aka Roger aka rvitko)
I got your email, I forwarded it to our office in Germany and they should respond soon. This week will be a slow response week because of the Easter holidays. It may take a while to hear back.
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