Hygger ETL Heater HG998-200W

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Keep your aquarium at a stable, comfortable temperature with the Hygger ETL Heater HG998-200W, a fully submersible 200W aquarium heater designed for freshwater and saltwater environments. Combining adjustable temperature control, automatic thermostat operation, durable quartz glass construction, and integrated safety protection, this heater offers a convenient solution for maintaining suitable water conditions for tropical fish and other aquatic inhabitants.

The Hygger HG998-200W features an adjustable temperature range of 68°F–93°F (20°C–34°C), allowing aquarium owners to select a suitable temperature for their livestock. Its automatic thermostat cycles the heating element on and off as needed, helping maintain consistent water conditions without constant manual adjustment.

With an ETL-certified electrical design, a heat-resistant glass tube, secure suction cup mounting, and a separate digital thermometer for monitoring water temperature, the Hygger HG998-200W combines practical everyday operation with important protective features.

Benefits of the Hygger ETL Heater HG998-200W

• 200W Heating Power: Provides heating capacity for appropriately sized freshwater and saltwater aquariums.

• ETL-Certified Design: Offers electrical safety certification for added confidence.

• Adjustable Temperature Range: Select temperatures between 68°F and 93°F (20°C–34°C).

• Automatic Thermostat: Switches heating on and off according to the selected temperature.

• Durable Quartz Glass: Features a heat-resistant heating tube designed for aquarium use.

• Overheating Protection: Incorporates a protective feature intended to reduce excessive heating.

• Dry-Run Safety Protection: Includes a safety fuse designed to respond to abnormal out-of-water operation.

• Easy Rotary Adjustment: Set the temperature using the convenient adjustment knob.

• Fully Submersible Design: Installs underwater according to the manufacturer's instructions.

• Freshwater and Saltwater Compatible: Suitable for a range of aquatic environments.

• Secure Suction Cup Mounting: Helps hold the heater in position inside the tank.

• Separate Digital Thermometer: Allows independent monitoring of aquarium water temperature.

Designed for Freshwater and Saltwater Aquariums

The Hygger HG998-200W is part of Hygger's HG998 ETL aquarium heater series, offering increased heating power compared with the 50W and 100W models.

Its 200W heating element is intended for aquariums that require more heating capacity, including tropical freshwater community tanks, planted aquariums, and appropriately sized marine systems.

Stable temperature is particularly important for tropical aquarium species because rapid fluctuations can affect metabolism, appetite, behavior, and general health.

The automatic thermostat helps regulate temperature by activating the heating element when the surrounding water cools and switching it off when the selected temperature is reached.

Actual heating performance depends on aquarium volume, room temperature, water circulation, tank insulation, and the difference between ambient and desired water temperatures.

For the best results, choose a heater based on both aquarium capacity and the temperature conditions in the room.

Adjustable Temperature Control from 68°F to 93°F

The Hygger HG998-200W features a rotary temperature adjustment knob that allows users to select a target temperature between 68°F and 93°F (20°C–34°C).

The clearly marked adjustment scale makes it convenient to choose the desired setting.

Once the heater is properly installed and fully submerged, its internal thermostat monitors the surrounding water temperature.

When the temperature falls below the selected setting, the heating element activates. When the desired temperature is reached, the thermostat automatically stops heating.

This repeating heating cycle helps maintain more consistent aquarium conditions throughout the day and night.

For accurate temperature management, use the separate digital thermometer to check actual aquarium water temperature. Allow the temperature to stabilize before making further adjustments.

ETL-Certified Safety and Protective Features

The Hygger HG998 series incorporates several safety features designed to support dependable aquarium heating.

ETL-Certified Electrical Design

The HG998 heater series is marketed with ETL certification, indicating evaluation against applicable electrical safety standards.

This provides an additional consideration when selecting an electrical appliance for aquarium use.

Overheating Protection

The heater includes a protective mechanism designed to stop heating when the detected temperature exceeds its specified safety threshold.

This helps reduce the risk of excessive heating under abnormal operating conditions.

Dry-Run Safety Fuse

An internal safety fuse is designed to interrupt heating if the heater is operated outside water for an extended period.

This is an emergency protective feature and must not be used as a substitute for correct installation.

Important: Always fully submerge the heater before connecting it to electrical power. Never intentionally operate or test the heater outside water.

Durable Quartz Glass Construction

The Hygger HG998-200W features a heat-resistant quartz glass heating tube designed for underwater aquarium use.

The glass construction helps protect the internal heating components while allowing heat to transfer into the surrounding water.

Its slim, dark-colored design helps the heater blend into many aquarium backgrounds.

Although the glass is durable, it should still be protected against impacts from rocks, decorations, gravel, and other hard objects.

Always inspect the heater before installation and discontinue use if the glass tube or electrical cord becomes damaged.

Independent Digital Temperature Monitoring

The HG998 series includes a separate digital thermometer for checking aquarium water temperature independently of the heater's adjustment setting.

A separate thermometer is useful because the actual water temperature may vary slightly from the temperature selected on the heater dial.

For representative readings, position the thermometer away from the heater's immediate heat output and in an area with adequate water circulation.

Regular temperature checks help aquarium owners identify changes caused by room temperature, equipment operation, or aquarium maintenance.

Suitable Aquarium Applications

The Hygger ETL Heater HG998-200W is suitable for appropriately sized setups, including:

• Tropical freshwater community aquariums

• Planted freshwater aquariums

• Freshwater fish tanks requiring supplemental heating

• Compatible saltwater fish aquariums

• Marine aquarium systems requiring temperature regulation

• Indoor aquariums exposed to seasonal room temperature changes

• Aquarium setups requiring automatic thermostat operation

• Tanks where independent temperature monitoring is preferred

Select the target water temperature according to the needs of the fish, plants, invertebrates, and other livestock in the aquarium.

Installation and Usage Guidelines

1. Inspect the heater: Check the glass tube, power cord, plug, and mounting components for damage.

2. Attach the suction cups: Fit the supplied suction cups securely to the heater.

3. Choose a suitable location: Position the heater in an area with good water circulation, following the manufacturer's instructions.

4. Fully submerge the heater: Ensure the heater is properly immersed before connecting electrical power.

5. Set the temperature: Rotate the adjustment knob to the desired setting.

6. Connect the power: Plug the heater into a suitable electrical outlet after completing the underwater installation.

7. Allow automatic operation: The thermostat will cycle the heating element on and off as needed.

8. Position the thermometer: Install the separate thermometer where it can measure representative water temperature.

9. Monitor temperature: Check that the aquarium reaches and maintains a suitable temperature.

10. Adjust gradually: Make small changes to the setting when necessary.

Safety and Maintenance Guidelines

• Never operate the heater outside water.

• Disconnect electrical power before water changes, cleaning, or moving the heater.

• Allow the heating element to cool before removing the unit from the aquarium.

• Never use a heater with cracked glass or a damaged power cord.

• Do not bury the heater in substrate or place it against hard decorations.

• Maintain good water circulation around the heater.

• Keep electrical connections dry and use a drip loop in the power cord.

• Inspect suction cups regularly to ensure secure mounting.

• Follow all manufacturer safety and operating instructions.

Product Specifications

• Brand: Hygger

• Product Name: ETL Aquarium Heater

• Model: HG998-200W

• Series: HG998

• Power Rating: 200W

• Heater Type: Fully submersible aquarium heater

• Water Compatibility: Freshwater and saltwater

• Temperature Control Range: 68°F–93°F (20°C–34°C)

• Temperature Adjustment: Rotary adjustment knob

• Thermostat: Automatic on/off heating control

• Heating Tube Material: Heat-resistant quartz glass

• Safety Features: ETL-certified design, overheating protection, and dry-run safety fuse

• Mounting: Suction cup system

• Temperature Monitoring: Separate digital aquarium thermometer

• Color: Black

• Primary Application: Aquarium water temperature regulation

Check the manufacturer's exact tank-size recommendation, heater dimensions, voltage, and regional electrical specifications for the HG998-200W before installation.

Product Specifications (Continued)

• Recommended Aquarium Capacity: Up to 65 gallons

• Temperature Control Accuracy: Approximately ±2°F

• Glass Thickness: Approximately 2mm

• Heating Medium: White alumina sand for heat transfer

• Overheating Cutoff: Approximately 93°F (34°C)

• Dry-Run Protection: Safety fuse activates after more than approximately three minutes of out-of-water operation

• Mounting Orientation: Vertical or horizontal, subject to installation instructions

• Thermometer Measurement Range: 32°F–122°F (0°C–50°C)

• Thermometer Display: Digital, with one-decimal-place readings

• Thermometer Power: Replaceable battery

Package Includes

• 1 × Hygger HG998-200W Aquarium Heater

• 2 × Mounting Suction Cups

• 1 × Digital Aquarium Thermometer

• 1 × User Manual

Reliable Heating for Aquariums Up to 65 Gallons

The Hygger ETL Heater HG998-200W is a practical choice for aquarium owners seeking adjustable temperature control, automatic heating operation, and built-in safety protection.

Designed for aquariums up to 65 gallons, this 200W heater combines a durable 2mm quartz glass tube, ETL-certified design, adjustable thermostat, and separate digital thermometer to help maintain comfortable water conditions.

Its freshwater and saltwater compatibility makes it suitable for a wide variety of appropriately sized aquarium setups.

Order the Hygger HG998-200W ETL Aquarium Heater today and enjoy convenient temperature regulation for your aquatic environment.