Finnex THH-500S 500 W Titanium Heater Tube

Exact-model photograph is not verified. This model-reference page is text-only. No inspected original photo identifies the 500 W THH-500S or a retail package: the Finnex THH photo is a family appearance image, and the model table is a specifications graphic rather than a product photograph. The full review keeps the shared family visual accurately scoped.

Finnex identifies the THH-500S as a 500 W sensor-equipped titanium tube for 70–130 US gallons, but says it needs a separate temperature controller and water above 150 ppm TDS. Its full electrical nameplate and complete installation details are not established here.

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Documented model details

• Finnex’s THH chart lists the exact THH-500S row as 500 W for 70–130 US gallons, with a 14.57-inch heater-tube length and current stated as 4.5 A at 115 V.
• The chart separately labels a 6-inch “Power Cord” field and a 70-inch controller-to-heater lead; those two entries do not establish a complete wall-to-tube cable route.
• Finnex says the THH element requires an external temperature-control unit and must not be plugged directly into a wall outlet. Its out-of-water sensor is a separate exposure cutoff, not the temperature thermostat.
• The THH family page names freshwater and marine use but also requires water with TDS above 150 ppm; selecting a water type alone does not establish that independent condition.
• The manufacturer describes sensor positioning, monthly cleaning/verification, and status/audio alerts; the inspected evidence does not replace the model’s full supplied setup instructions.

Limits to weigh

• The 4.5 A value is stated at 115 V; a complete THH-500S input-voltage range, frequency, or exact unit nameplate is not established.
• An external controller is mandatory, but the exact compatible controller and its setpoint range are not established for this tube. The manufacturer warns against direct wall connection.
• The above-150-ppm TDS prerequisite is not represented in this site’s questionnaire or matcher.
• The maker’s 70–130-gallon band has a 70-gallon lower boundary that the current maximum-only volume rule cannot enforce; the model therefore stays reference-only rather than being presented as a finder match.
• Exact immersion depth, mounting orientation, required clearance, full sensor installation route, and dry-operation permission remain unknown in the inspected materials.
• The table’s six-inch “Power Cord” entry has an unclear practical definition alongside the separate 70-inch controller lead; verify both against the actual item instead of inferring reach.
• No exact THH-500S product photograph, retailer SKU/UPC, or confirmed package contents are established. A grouped retailer record names the model but currently offers no selectable option; that does not prove the model is absent or discontinued.

Check before ordering

• Confirm the actual label says THH-500S / 500 W, not the separate TH-500S or THD-500S, which are different Finnex families.
• Before use, verify the unit’s full nameplate and the exact compatible temperature-control device. Confirm whether the selected package includes that controller; do not plug the tube directly into a wall outlet.
• Check the aquarium’s measured TDS against Finnex’s strict above-150-ppm condition; the finder’s freshwater/saltwater choice does not answer it.
• Compare the intended aquarium with both ends of the maker’s 70–130-gallon band and separately assess the actual temperature change needed; the upper rating is not a performance guarantee.
• Read the instructions supplied with the exact THH-500S package for immersion, orientation, sensor placement, clearance, and monthly sensor checks before installation.
• Verify the actual cable lengths, connector arrangement, package contents, and placement against the aquarium and controller; the published six-inch and 70-inch fields are not one confirmed total reach.