I purchased my tankless direct 5 years ago. Roughly in the first year it started throwing error codes. I tried several times to make contact, both by phone and by email. I finally reached someone through email because of a bad review I left. The person immediately gave me a runaround on the reason for the error code and said it wasn't the product. After several interactions he got what he wanted and that was for me to just go away. I spent several years running up and down my stairs resetting the system to take a hot shower. I am now 66 doing chemo and can no longer do the shower marathon needed. I called a service person to check it out and they told me it was the flame arresters. (not what the rheem tech told me) by now I am down to just the parts paid warranty so told them to fix it. Just as stated in many of the other complaints is that rheem does not have the parts and suggested we search the internet and send them a parts bill. Of course they would, they have gotten out of the labor part by running this customer around. Very poor everything.
Recommendation: Do not purchase a Rheem