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Which HMU option is documented as 500 W?
The official Finnex Shop lists a 500 W HMU choice with SKU HMU-500S and its own Shopify variant ID. Its official variant barcode field is blank, so the UPC is unverified.
Explore this need in the finder →Does Finnex publish a tank-size range for HMU 500 W?
Not in the primary Shop record or the reviewed comparison chart. The chart gives a 100–500 W family span but no capacity band. Do not turn 500 W into a gallon recommendation; this variant remains reference-only.
Explore this need in the finder →What control range can be attributed to HMU 500 W?
Finnex’s comparison chart lists a shared 68–92°F HMU range for its 100–500 W span. This is a manufacturer claim, not an independently measured water temperature; the product still lacks a supported tank capacity and setup.
Explore this need in the finder →Finnex HMU digital titanium series · 500 W · reference-only assessment
Finnex's official Shop record identifies the top listed HMU choice as 500 W and assigns it SKU HMU-500S plus a distinct variant ID. The comparison chart includes 500 W as the upper end of its listed 100–500 W HMU span. This confirms the model option and the chart's general family claims, but it does not establish a safe aquarium size or expected temperature rise. A larger wattage is not automatically the right selection simply because an aquarium is large; the maker's exact capacity guidance and installation conditions are missing.
Family claims supported by Finnex
The HMU Shop page describes a titanium heating tube, remote temperature sensor, digital controller with adjustable settings, guard around the tube and a non-resumable fuse intended to cut power if exposed to air. The comparison chart adds a steel heating coil, push control, digital display, 68–92°F control range and Japanese components for 100–500 W. These are manufacturer descriptions and not independently measured. They do not specify the HMU-500S's current draw, exact supply range, length or a complete operating manual. In particular, “digital” and “remote sensor” are not proof of precise water temperature in a tank; verify water with an independent thermometer.
Why the maximum wattage is still not a recommendation
Within this series, 500 W distinguishes HMU-500S from the 400 W option immediately below it. But the manufacturer material retrieved here gives neither a tank-volume band nor the assumptions behind one for HMU-500S. Room conditions, lid and circulation can change heat loss, and the exact position of a separate sensor matters; the sources do not provide HMU-specific installation instructions for these details. I will not substitute an HMA or HMC recommendation, convert watts to a gallon estimate, or suggest a dual-heater arrangement without evidence for this configuration.
Exact-package questions remain unresolved
The official variant record confirms model code and wattage, but leaves barcode blank. The current Shop listing displayed all variants as sold out when checked; that transient state does not establish a discontinued model or broader market status. The official Finnex instructions index shows manuals for other heater lines but not HMU. The three-image grouped gallery is not wattage-specific and has no visible 500 W model label, so it is not presented as an exact-model photo. Confirm HMU-500S on a real package, then obtain its capacity, electrical and installation instructions before considering it. This item remains reference-only, not a finder match or BuyerShortlists purchase page.
Evidence checked
Sources: Finnex's HMU Shop record, the official series comparison chart and the Finnex instructions index. No test, ownership or customer experience is claimed.
Key specifications
Key details at a glance
| Rated heater power | 500 W |
|---|---|
| Lowest thermostat setting | 68°F |
| Highest thermostat setting | 92°F |
| Temperature control | Adjustable thermostat |
Use the exact model’s instructions for operating limits, supplied equipment and version differences.
Sources for this review
Sources for this assessment
Check the complete aquarium setup
Use the finder to compare documented tank size, water type, installation and temperature-control fit. A match does not guarantee the keeper's species-specific target or measured performance.