One person, working alone, in the United States. No editorial team, no laboratory, no sponsored placements, and no products sitting in a garage waiting to be photographed.
Not ownership of the equipment — we do not own it. The qualification is the willingness to read the manual, the standard and the code article all the way through, put them next to each other, and publish it when they disagree. That is unglamorous and it is what almost nobody does.
The questions that actually stall a home systems purchase are not questions a review answers. What breaker does this heater need. What does that coverage claim mean. How big a softener, and why do two quotes differ by a tank size. Those have documented answers sitting in manufacturer manuals, published standards and federal guidance, and the answers frequently conflict with each other.
Owning the product does not help you find those conflicts. Reading does. That is the entire basis on which this site asks for your attention, and if it ever stops being true the site stops being worth anything.
This site is not professional electrical, plumbing or structural advice, and no page here is a specification. Everything is reproduced from published documentation and linked so you can verify it. The work that ends up in your walls has to be designed and installed by licensed trades working to the code edition your jurisdiction has adopted, and inspected. Bring them the equipment's manual, not a printout of a website — including this one.
Corrections are the most useful thing you can send. If a figure here does not match the source linked beside it, or a manual has been revised, or your inspector told you something that contradicts a page, that is worth more to this site than a compliment. Pages carry review dates so you can see how stale something is before you rely on it.