Finnex HMH-150S 150 W Digital Titanium Aquarium Heater

Exact-model photograph is not verified. This reference lookup is text-only. No exact HMH-150S wattage or package photo is verified; the full review’s registered official HMH-family visual is captioned as family appearance and does not establish this size, a retail package, or an exact selected assembly.

Finnex’s September 2020 HMH manual lists the HMH-150S at 150 W for a 30–60 US-gallon band, with an 8.86-inch titanium tube and built-in tube sensor. Its low-water warning/cutoff works only from 58–92°F; this is a model reference, not a finder match or verified current retail offer.

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 exact manual row lists HMH-150S at 150 W, 1.35 A at a 115 V reference, 30–60 US gallons, and an 8.86-inch tube. It also lists a 55-inch power cord, 35.4-inch controller-to-heater lead, and a 47-inch field labelled ‘Sensor Cord’; the 115 V current reference is not a complete electrical nameplate.
• The digital controller offers a 50–94°F setting range in 0.1°F increments, with stated ±0.5°F display accuracy. Finnex describes sensing in the heater tube; these are manufacturer specifications, not independent measurements of aquarium-water stability.
• The manual requires full immersion, suction-cup mounting to glass, water movement around the heater, and the sensor area at the cord/heating-element junction higher than the rest of the tube. It allows aquarium or filter-sump placement and calls for 15 minutes of acclimation before plugging in, a drip loop, GFCI-protected power, and at least 15 minutes of cooling before removal.
• The manual’s low-water warning/cutoff is active only from 58–92°F and is disabled outside that interval; its troubleshooting text warns that the heater may continue heating when the sensor is exposed outside the active range. Finnex’s HMH family page separately says the heater is for freshwater or marine use only in water above 150 ppm TDS.

Limits to weigh

• The 30-gallon lower boundary matters. This site’s volume matcher filters a maximum only, so it cannot reject a smaller tank against the HMH-150S minimum; the model remains reference-only and this page does not certify suitability for an aquarium.
• The 1.35 A value is specified at 115 V, not as a complete unit voltage/frequency supply rating. The exact current retail SKU, UPC, matching Shop variant, seller offer, and package contents were not established in the reviewed records.
• The maker’s 30–60 US-gallon band is not a heating-performance guarantee for a particular room, target, cover, or aquarium. The stated display accuracy does not measure tank-water stability, and no actual performance testing is claimed.
• The low-water protection is not active outside 58–92°F and must not be treated as permission for out-of-water operation; the manual requires full immersion. The exact current seller instructions and supplied configuration still need to be checked against the item received.
• No wattage-specific HMH-150S product or package photograph is verified. The full review’s official HMH-family visual is explicitly not identified as this exact size or a retail package.

Check before ordering

• Check that the offered variation, heater label, and carton explicitly identify Finnex HMH-150S at 150 W; do not substitute HMH-100S, HMH-200S, HMS-150S, or another family. A current individual retail SKU/UPC was not established.
• Read the actual unit’s full voltage and frequency nameplate before connection. The manual’s 1.35 A at 115 V is a reference point, not a complete electrical supply rating.
• Compare the aquarium with both ends of Finnex’s 30–60 US-gallon band and independently consider the required temperature change and room conditions; 60 gallons is not a guaranteed heating outcome. Check water TDS against the family page’s above-150-ppm condition even when the water is described as freshwater or marine.
• Use the exact HMH instructions for full immersion, secure suction-cup mounting, circulation, raised sensor-junction placement, the 15-minute acclimation, GFCI and drip loop, and cooling before removal. Confirm any current supplied directions for the actual offer.
• Check the intended setpoint against the 50–94°F range and 0.1°F setting steps. Do not rely on low-water protection outside 58–92°F; verify the aquarium temperature independently with a suitable thermometer.