You're about to wire thousands of dollars to a company you found last week. Some of these companies are 40-year manufacturers; some are marketing sites that have never touched the product they sell. Here are the seven checks that tell them apart — no insider knowledge needed.
The check: take the product photo and run a reverse image search. If the identical cabin appears under four different brand names at four different prices, you're looking at a white-labeled OEM unit behind a marketing storefront. That's not automatically bad — but you should be paying the lowest of those four prices, and warranty support will only ever be as real as the storefront selling it.
The check: "10-year warranty" from a brand whose domain was registered 18 months ago is a promise from a company that has never been 10 years old. Look up the domain age (any WHOIS lookup) and the state business registration. Established manufacturers are proud of their founding year; storefronts hide it.
The check: find a physical address and call the number before ordering. If pre-sale questions take three days by email, imagine warranty service. Real manufacturers answer the phone and know their own spec sheets.
The check: compare the marketing page's heater rating to the installation manual's electrical requirements (manuals are usually downloadable). Mismatched kW figures, missing breaker-size guidance, or "plugs into any outlet!" claims on 5kW+ heaters mean nobody technical is checking the copy. Run the manual's real numbers through our electrical checker.
The check: ask which parts carry a UL or ETL listing (heater, chiller, controller) and ask for the listing number. Unlisted electrical equipment can void home insurance claims and fail inspection — and an evasive answer here is a complete answer.
The check: read what's excluded, not what's promised. The components that actually break are heaters, chillers, and controllers. A "lifetime warranty" covering only the wood shell while the chiller gets 90 days is a wood warranty, not a product warranty.
The check: perpetual "$2,000 off, ends Sunday" countdowns and permanent 30% sales mean the discount price is the price and the "regular" price is an anchor. Compare against our verified price table — we record both sale and regular prices with dates, so anchor pricing is visible.
Reverse-image-search the product photo → WHOIS the domain → find address + call the phone number → download the manual and check the electrical spec → ask for the UL/ETL number → read the warranty exclusions → screenshot the price and check it in a week. Any brand that passes all seven is worth shortlisting — then run its true 5-year cost before you commit.
This guide describes objective checks anyone can run; it names criteria, not targets. As our database grows, units failing specific checks are flagged on their own comparison entries with evidence. Methodology.