Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: Is warranty void automatically when buying this way? The warranty appears to be void if not purchased by an "authorized dealer".
Document: needed to replace old tank water heater and got good reviews on this model. Additionally MFR provides extended labor warranty - sweet!Ask your plumber about ordering the shroud required for mounting - all else was included which isn't always the case.
This heats really efficiently and quickly. The plumbers we have talked to also say it is a great product. Only problem is that when we changed from a tank to tank-less it revealed flaws in our plumbing. That cost another couple hundred to fix, but we still aren't sure why the flaws were more pronounced with the tank-less when the water is hotter and the heated water comes to the faucet faster...either way, I only mention for reference.
When it works, it's pretty good. Doesn't have quite the same "push" as a tank water heater, as there isn't a 300-pound column of water being pulled towards the outlet in the tank by gravity. However, as advertised, it will keep water flowing at a constant temperature. You can take a shower for 5 minutes or 5 hours, and the temperature will never change!Now, the design flaw.
These things aren't terribly hard, just a bit of a pain on the install. I understand they don't want someone thinking it would be a good idea to increase the temperature to 140 degrees, or something like that.
The lower capacity 7.5 would have been adequate for my two bedroom house, but my plumber recommended the 9.4 because the "isolator valves" are included with the 9.4, but not the 7.5. If you get the 7.5 you'll have to pay about $100 for these valves. A no-brainer, why not get the 9.4 for about the same price as the 7.5 and you get the larger flow capacity as a bonus.
One little problem is that the separate touchpad hangs by two short wires, which are too short to allow attachment to the wall. So the panel about the size of a small cell phone dangles loose on these two wires. I'll need to splice to make longer.Another problem I read is that heater doesn't kick on when faucet is opened for low flow. I'm not having this problem. It turns on with slightest flow. Further, I read that tankless heaters don't work well when water pressure is low.
My husband will be installing this when the weather changes and the new water line is finished, it looks to be in good condition.
In summary, I highly recommend this product, with only two minor complaints, the touch pad wires are too short and the heater attachment screws (to outside stucco wall) seem too small for the job. Thus, I asked my installer to use larger expansion/toggle screws to give me confidence that heater is firmly secured to wall (as I couldn't find a stud to screw into).
If you don't do this, the calibration it tries to run when it's powered on will fail. Fortunately, there is a reasonably quick solution.The following was adapted from page 15 of the manual: [...] - Use it at your own risk. If your heater doesn't work, maybe just call a plumber. (Hand them a printout of this if they get stumped.
I've had one for 3 years and it works like a charm, saves a ton of space inside by hanging outside, and you never run out of hot water. I just bought a second one for another house and love it just as much.
Answer: yes