Finnex HMA-500s 500 W Titanium Aquarium Heater

Exact-model photograph is not verified. Text-only reference lookup. The official HMA family image visually shows a tube, controller, and guard, but no 500 W/model label or exact package identity; the existing review’s family-scope image is not an exact HMA-500s assembly.

Finnex’s HMA table identifies the HMA-500s as its 500 W row, rated for 100–120 US gallons with 68–92°F control and 4.5 A at a 115 V reference. The current matcher cannot enforce the 100-gallon floor, and the reviewed sources do not establish a complete electrical rating, HMA installation instructions, or a current retail package, so this remains an identification reference rather than a tank-fit match.

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Documented model details

• Finnex’s HMA table names HMA-500s at 500 W and 4.5 A at 115 V, with a 68–92°F family control range and a 100–120 US-gallon band. It identifies a separate HMA-300s row at 300 W and 80–100 gallons; the published ranges meet at 100 gallons, which does not establish which model is appropriate for a particular tank.
• The family table footnote limits its rating context to a standard enclosed aquarium and states maximum heating capacity of ±8°F above ambient room temperature. This manufacturer sizing statement is not a room-specific temperature guarantee or a performance test.
• Finnex describes HMA control as precision analog in its overview and also uses “electronic control” in descriptive copy; the wording is retained as ambiguous, not split into two control modes. The page claims ±2°F around the setting, which is a manufacturer statement rather than measured aquarium-water stability.
• The HMA family page describes a titanium tube, heater guard, LED indicator, adjustable dial, and freshwater/saltwater use. Those family claims do not establish the exact HMA-500s retail package or its installation requirements.
• The captured Finnex instruction index lists manuals for HMH, HMS, and HPC but no HMA manual. HMH is a distinct family, so its installation, control, and safety directions are not transferred to the HMA-500s.
• The 4.5 A figure is tied to a 115 V reference; the reviewed HMA sources do not provide a full allowed input-voltage range or frequency. The exact model’s SKU/UPC, package, body dimensions, clearance, and complete setup arrangement also remain unverified.
• The 2026-10-31 official Shop collection capture displayed ten cards without a visible second-page control and did not identify an HMA offer. That bounded collection result is not a full Finnex catalogue or discontinuation finding.

Limits to weigh

• The manufacturer’s stated 100–120 US-gallon band has a meaningful 100-gallon lower boundary. The current finder can enforce only a maximum volume, so the HMA-500s remains reference-only and must not match a tank merely because it is under 120 gallons.
• The sizing band and ±8°F-above-ambient footnote are manufacturer statements for a standard enclosed aquarium, not a calculated recommendation for a particular room, tank cover, target temperature, or livestock.
• The page does not establish the complete electrical nameplate, permitted supply, frequency, installation or clearance directions. Verify the actual HMA-500s label and its own instructions before electrical or installation decisions; do not infer suitability from amperage at 115 V.
• The reviewed manufacturer instruction index does not list an HMA manual. This bounded index result does not prove that no such instructions exist, and no HMH or other-family directions are substituted.
• No exact HMA-500s wattage/package photograph was verified. The inspected official family photo shows a titanium tube, separate controller and guard but no wattage/model label or selected-package identity; it is not represented as the 500 W assembly.
• The retained exact-model Amazon search returned HTTP 503 before result cards or product details were visible. No ASIN or package identity was established; the blocked request is not evidence that a listing does not exist.

Check before ordering

• Check that the product label, selected variation, and carton explicitly identify Finnex HMA-500s / 500 W. Do not substitute HMA-300s or another Finnex titanium-heater family.
• Check the complete 100–120 US-gallon range, including its 100-gallon minimum, against the actual aquarium and conditions. Do not treat the table as a performance guarantee or choose between the HMA-300s and HMA-500s from the shared boundary alone.
• Read the actual unit’s full electrical nameplate and HMA-specific instructions. The family row’s 4.5 A at a 115 V reference does not specify the allowed input range, frequency, circuit requirements, immersion, position, or clearance.
• Verify the actual seller package, guard/controller arrangement, cord, and return terms rather than assuming every family-level feature appears in an unverified offer.
• The saved route is a full-model Finnex HMA-500s search, not an exact-listing promise. Verify the model and package on the destination; do not accept an HMA-300s or sibling configuration as equivalent.