Aqueon Aquatic Flat Heater 15 W

Exact-model photograph is not verified. The original review uses the exact family-page-linked 15 W package image at assets-source/products/images/aqueon-flat-15w-package.jpg; SHA-256 566119d5b31988e2bd78b9c33fbb4044a7b0b1220da89198456a4a47ccff0d97. The photo remains package-identification context, not a selected-product fit or performance demonstration.

Aqueon’s exact US page says the 15 W Flat Heater suits 4–10 gallons, while its 2025 catalog lists 5–10; the Model 01231 manual confirms the ten-gallon ceiling. The source-disputed lower recommendation and upper-only matcher mean this exact model stays a visible reference, not a finder or purchase match.

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Documented model details

• The current family page identifies 15 W as Item 100101231 / SKU 100101231 / UPC 015905012317; the manual names the same wattage as Model 01231, and the 2025 US catalog repeats the item, UPC and 15 W rating.
• The product page gives 4–10 gallons, but the catalog Aquarium Size column says 5–10. The Model 01231 manual confirms up to 10 gallons. The separate chart marks 0.5, 1 and 2.5 gallons not recommended and 5/6 recommended; it has no four-gallon column and cannot settle the discrepancy.
• The shared manual identifies 120 V / 60 Hz for Models 01230 and 01231. For the 15 W version it estimates an average 3–6°F increase above ambient; the current exact page separately claims up to 6°F. Neither is an independent performance measurement or a selectable thermostat setting.
• The exact product page describes fully submerged in-tank use, vertical or horizontal suction-cup placement, shatterproof construction and use with glass or acrylic. The manual calls for circulation and water at least to the minimum-waterline mark, a 30-minute submerged wait before plugging in, unplugging before removal or service, indoor use and removal when room air exceeds 78°F; it forbids powered operation outside water.
• The page’s displayed 4.75 × 1.75 × 9.25-inch dimensions match the catalog’s retail-package tuple, while the catalog lists separate item dimensions whose axes do not establish mounting clearance. The verified image is a 15 W retail package, not a to-scale view of the installed heater.

Limits to weigh

• The exact page and catalog give different lower recommendations (4 versus 5 gallons), and the numeric matcher checks only the 10-gallon maximum. It would also return the model for 1–3 gallon tanks, so it remains outside finder and buying matches.
• The pointwise chart confirms only its listed size marks; it neither tests four gallons nor independently resolves the page/catalog lower-bound disagreement.
• No selectable Fahrenheit target, freshwater/saltwater suitability, exact body dimensions, maximum immersion depth or measured temperature performance is established by the reviewed evidence. The PTL overheat shutoff is not permission to run the unit dry.
• The current catalog confirms an exact manufacturer configuration, not present stock, lifecycle, seller offer or package contents. The package photograph establishes its printed 15 W identity and claimed upper rating only.

Check before ordering

• If evaluating a manually located offer, verify Aqueon Aquatic Flat Heater 15 W, Model 01231, Item 100101231, UPC 015905012317 and the 120 V / 60 Hz label on the actual offer or carton; do not substitute either smaller flat-heater variant.
• Treat the page’s 4–10 gallon claim and catalog’s 5–10 table range as a documented disagreement, not a settled lower limit or a 10-gallon-only rating. This reference is not a finder-approved fit.
• Check the supplied manual, marked minimum waterline, suction-cup position and circulation; follow the submerged wait and unplugging instructions, and never leave the powered heater outside water.
• Do not use the product-page/package dimensions as heater-body clearance. Confirm the actual offered package, fit and current warranty terms; room temperature and aquarium conditions still affect heating.