We have the Kuuma, and the thermostat stopped working, it was out of warranty and we were the second owners but they still shipped me a free replacement part.
When you go to install it it is highly worth getting the bypass kit if it's anything like ours and shoved down in a locker where it's hard to reach, and impossible to remove the hoses. I found about 5 stainless steel screws and a long Robertson bit with a screw still taped to it down in ours.
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