Tetra Heater

The Tetra HT series consists of two distinct types of submersible aquarium heaters: the Adjustable/Electronic Series (primarily available in European/International markets with a variable temperature dial) and the Preset Submersible Series (primarily in the US market, fixed at 78°F).

Tetra HT Adjustable / Electronic Heaters

These models feature an electronic thermostat and a manual dial to adjust the temperature manually.

Temperature Range: Adjustable from 20°C to 32°C (68°F to 90°F) in 1°C increments.
Thermostat Accuracy: High precision variance of ±0.25°C to ±0.5°C.
Electrical Supply: 220–240V AC, 50/60 Hz.
Display Indicator: 3-stage status LED temperature control.
Submersible Rating: Fully waterproof with an IPX8 rating up to a maximum immersion depth of 800 mm.

Power Cord: 1.5 to 1.6 meters long.
Safety Controls: Integrated microprocessor control, dry-run protection, and an extra safety automatic shut-off feature.

Model Sizing Matrix (Adjustable)

Model	Wattage	Target Aquarium Capacity	Physical Height
HT 25	25W	10 to 25 Liters	217 mm
HT 50	50W	25 to 60 Liters	228 mm
HT 75	75W	60 to 100 Liters	270 mm
HT 100	100W	100 to 150 Liters	270 mm
HT 150	150W	150 to 220 Liters	313 mm
HT 200	200W	220 to 300 Liters	313 mm
HT 300	300W	300 to 450 Liters	367 mm

Power Cord: 1.5 to 1.6 meters long.
Safety Controls: Integrated microprocessor control, dry-run protection, and an extra safety automatic shut-off feature.

Tetra HT Preset Submersible Heaters

These variants are fully automatic and preset out of the box, requiring zero manual calibration.

Temperature Range: Factory set to maintain 78°F (25.5°C) automatically.
Thermostat Variance: ±2°F depending on ambient room temperature.
Electrical Supply: 120V AC, 60 Hz.
Status Indicators: 2-Stage LED (Red when actively heating, Green when standby temperature is reached).
Materials: Thick, shock-resistant and heat-resistant borosilicate glass core with silicon carbide elements for even thermal distribution.
Safety Controls: Low-voltage thermostat circuit with automatic electrical short/overheat protection shut-off.