Finnex HMS-50S 50 W Digital Titanium Aquarium Heater

Exact-model photograph is not verified. Text-only model-reference page. The registered official HMS family visual shown with the full assessment depicts shared series components but does not identify the 50 W size, its dimensions or an offered package; it is not used as a photograph of this exact assembly.

Finnex’s September 2020 HMS table places the 50 W HMS-50S in a 10–20 US-gallon band and lists a 6.30-inch heater tube. The current finder cannot enforce that lower limit, and the reviewed official store material did not establish an individual retail variant, so this is an exact-label and setup reference—not a tank-fit recommendation.

Search results may include other models. Confirm the exact model, applicable region, condition and included parts before ordering.

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Documented model details

• The HMS manual gives this 50 W row a 10–20 US-gallon band, 0.45 A at 115 V and a 6.30-inch tube. It lists 47 inches for the power cord, 30 inches from controller to heater and 47 inches for the sensor lead.
• The HMS controller is listed for 50–94°F adjustments in 0.1°F steps, with Finnex stating ±0.5°F display accuracy. HMS uses a separate remote sensor; its position and lead routing are part of the installation, unlike the HMH family’s internal sensing arrangement.
• Finnex describes the HMS family’s titanium tube, protective guard and freshwater/marine use, subject to operating in water above 150 ppm TDS. These are manufacturer descriptions, not independent performance testing or proof of any seller’s package contents.

Limits to weigh

• The 10-gallon lower boundary is not enforced by the current maximum-only volume question. At 20 gallons, the manual also lists the adjacent 100 W HMS row; this reference does not choose a heater for a particular aquarium or convert a maker’s band into a heat-up guarantee.
• The 0.45 A figure is tied to the manual’s 115 V reference, not a complete supply voltage/frequency nameplate. An individual current Shop variant, retail SKU/UPC, exact revision and seller package were not resolved; the bounded store omission is not evidence of discontinuation.
• Finnex limits the HMS low-water warning/protection behavior to 58–92°F; outside that band the low-water system is disabled and heating may continue if the sensor is exposed. The separate family requirement of more than 150 ppm TDS is not checked by the finder.
• No wattage-marked HMS-50S package photograph or independent aquarium performance measurement was verified. The model-reference page is text-only and does not certify a package or compatibility.

Check before ordering

• Check the unit and offer for the exact HMS-50S / 50 W identity; do not substitute the HMS-100S or the similarly named HMH-50S, which uses a different sensor arrangement.
• Treat 10–20 US gallons as the manufacturer’s two-sided band. The 20-gallon endpoint is shared with a different HMS wattage; do not use this label lookup as a sizing decision for a particular tank.
• Inspect the actual electrical label for the complete input rating and confirm the exact controller and remote probe in the offered package before purchase; 0.45 A at 115 V is not a full supply specification.
• Before use, follow Finnex’s separate-probe placement and full-immersion instructions, observe the limited 58–92°F low-water protection window, confirm water exceeds the maker’s 150 ppm TDS condition, and use the stated electrical safeguards.