Model reference
Finnex THD-300S 300 W Titanium Heater Element
Model: Finnex THD-300S titanium heater element, 300 W
The Finnex family table names THD-300S and gives its model-specific dimensions and capacity band; the grouped US Shop data identifies its 300 Watt option as SKU THD-300s (lowercase terminal s). The exact model-marked retailer photograph is used only for identity. This scope does not establish a controller included with the element, an exact seller offer/package, a complete electrical rating, or model-specific installation directions, and it does not imply a questionnaire match.
This model lookup is separate from the questionnaire shortlist. It does not certify that this model meets your selected requirements.
Finnex identifies the THD-300S as a 300 W titanium/quartz-sleeve element for 40–80 US gallons, with a 12.5-inch body and slimmer 0.62-inch diameter than the same-wattage TH-300S. A separate controller is required and the 40-gallon floor is not enforceable by this finder, so this remains a model reference rather than a ready-to-use recommendation.
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Documented model details
- Finnex’s THD-300S row lists 300 W, 120 V, 2.7 A, a 40–80 US-gallon band, a 12.5-inch length and 0.62-inch diameter. The amperage field has no stated reference-voltage condition, and the published length is not an installation-clearance measure.
- The Shop’s 300 Watt option is SKU THD-300s; its family page uses THD-300S and the variant has no UPC/barcode. The source identity is retained with its capitalization difference.
- Finnex describes THD as titanium with an internal quartz sleeve and says TH/THD units include a high-temperature guard and are for freshwater/marine use. The Shop says the heating element is sold without a controller; no THD-specific controller pairing is established.
- The retailer package photo visibly selects THD-300S / 300 W. It identifies the option but does not prove exact length, performance or a seller’s currently shipped package.
Limits to weigh
- The maker’s 40–80-gallon band includes a 40-gallon minimum the current maximum-only finder cannot enforce. This entry is not a tank-fit recommendation.
- Finnex lists 120 V and 2.7 A in separate fields without explicitly tying the current to a reference voltage; frequency and complete supply input are not documented.
- The element is not shown with a built-in thermostat or included controller; no THD-300S-specific controller pairing or seller package is established.
- The reviewed pages do not give a model-specific immersion mark, orientation, clearance, dry-operation rule or complete installation procedure. The instructions index does not list a THD manual, which is not proof that none exists elsewhere.
- The model-marked image is a retailer photo, not a scale or performance record and not evidence of current seller availability or delivered contents.
Check before ordering
- Check that the element and package identify THD-300S / 300 W. The official Shop SKU is THD-300s and has no UPC in the saved variant record; do not substitute TH-300S or another THD wattage.
- Respect Finnex’s complete 40–80 US-gallon band, including the 40-gallon lower limit; the public finder cannot enforce that floor.
- Verify which separate temperature controller is compatible and what is included in the specific offer. Check the controller’s load and connection against the exact element.
- Read both nameplates for full voltage/frequency/current information and obtain the instructions for the exact pairing before installation. The 12.5-inch tube length does not establish required clearance.
- If using the model-search action, verify the exact THD-300S / 300 W option, seller, condition and included control parts; do not treat a model search as a confirmed listing.