The exact model is the unit of comparison
Capacity, wattage, dimensions and installation instructions belong to a model and market. We do not merge a newer generation, another wattage or a similar-looking package into an existing record. Brand or family names alone are not enough to identify a product.
Published ratings and unknowns
Manufacturer ratings remain attributed ratings. Pump output, filter circulation and maximum flow are stored separately. Missing values are null, not zero. A missing hard fit requirement yields a check to complete, not a compatibility pass. Conflicting source values are preserved in the relevant record.
The catalog is not a hands-on test database. There are no editorial decibel rankings, universal scores or claims that equipment has been used by this publication.
Sources and review dates
Each record links to the manufacturer page and manual used. Shared references are consolidated on the page; field relationships remain in the catalog. The initial catalog was source-reviewed September 7, 2026. Fixed model specifications use a 90-day review window: dimensions, rated capacity and nameplate watts generally change with a model revision, so this is a periodic verification window rather than a live availability or price feed. A rebuild never renews that date. Beyond the window, or if a review date is invalid or in the future, the guide withholds current capacity matches and product wattage prefills. Historical specifications and ordinary product links remain readable. Your own measured values stay usable, and label watts you enter are not treated as a newly verified catalog claim. See equipment data for the exact coverage and known gaps.
Calculators
The calculators perform transparent unit conversion and arithmetic. Their examples are labeled assumptions. Nominal aquarium volume is not treated as measured water volume; heater energy uses a reader-entered duty range; unpriced setup fields produce a partial total. Results do not establish animal suitability or structural/electrical safety.
Product pictures and commercial links
Exact Amazon product images, where present, come from current licensed API image links and expire within 23 hours. We do not retain image binaries or use generated pictures as real products. If an image is unavailable, the factual record remains readable. An image links to the exact Amazon item it depicts.
Commercial arrangements never set product order or override fit. See the affiliate disclosure for the current status.