Order processing time: 3–5 business days
Maintain a stable and comfortable aquatic environment with the Hygger ETL Heater HG998-100W, a fully submersible aquarium heater designed for freshwater and saltwater aquariums up to 30 gallons. Featuring adjustable temperature control, durable quartz glass construction, and built-in safety protection, this 100W aquarium heater provides convenient and consistent heating for tropical fish tanks, planted aquariums, and compatible marine setups.
The Hygger HG998-100W combines an easy-to-use rotary temperature adjustment knob with an automatic thermostat that switches the heating element on and off according to water temperature. Its adjustable temperature range of 68°F–93°F (20°C–34°C) allows aquarium owners to select appropriate conditions for a variety of temperature-sensitive aquatic inhabitants.
Built with a 2mm-thick quartz glass heating tube, ETL-certified electrical design, dual suction cup mounting, and an included digital thermometer, this aquarium heater offers a practical combination of heating performance, temperature monitoring, and protective features.
Benefits of the Hygger ETL Heater HG998-100W
100W Aquarium Heating: Designed for freshwater and saltwater aquariums up to 30 gallons.
ETL-Certified Design: Provides electrical safety certification for added confidence during aquarium use.
Adjustable Temperature Range: Set the desired temperature between 68°F and 93°F (20°C–34°C).
Automatic Thermostat Operation: Switches heating on and off to help maintain the selected temperature.
2mm-Thick Quartz Glass: Features a durable, heat-resistant heating tube.
Overheating Protection: Stops heating when the detected water temperature exceeds the heater's safety threshold.
Dry-Run Safety Fuse: Provides additional protection if the heater is operated outside water.
Easy Rotary Temperature Adjustment: Allows convenient temperature selection using a clearly marked adjustment knob.
Fully Submersible Construction: Designed for underwater operation in suitable aquarium installations.
Dual Suction Cup Mounting: Helps secure the heater inside the aquarium.
Freshwater and Saltwater Compatibility: Suitable for a variety of aquarium environments.
Included Digital Thermometer: Allows independent monitoring of actual aquarium water temperature.
Designed for Aquariums Up to 30 Gallons
The Hygger HG998-100W is the 100-watt model in Hygger's HG998 ETL-certified aquarium heater series.
According to Hygger's recommended sizing, the 100W model is suitable for aquariums with capacities of up to 30 gallons.
It provides a practical heating solution for medium-sized freshwater aquariums, tropical community tanks, planted aquariums, and appropriately sized saltwater systems.
Maintaining a consistent water temperature is important for many aquarium inhabitants because temperature fluctuations can affect fish metabolism, feeding behavior, and overall well-being.
The Hygger HG998-100W helps reduce unwanted temperature changes by automatically regulating its heating cycle according to the selected thermostat setting.
Actual heating performance depends on aquarium volume, ambient room temperature, water circulation, tank insulation, and the difference between room temperature and the desired aquarium temperature.
For aquariums kept in particularly cold environments, additional heating capacity may be necessary.
Adjustable Temperature Control from 68°F to 93°F
The Hygger HG998-100W features a rotary temperature adjustment knob that allows users to select a desired water temperature between 68°F and 93°F (20°C–34°C).
Simply rotate the knob until the indicator aligns with the preferred temperature on the adjustment scale.
Once the heater is correctly installed and fully submerged, its internal thermostat monitors the surrounding aquarium water.
When the water temperature falls below the selected setting, the heating element activates.
When the water reaches the desired temperature, the heater automatically stops heating.
This cycle repeats as necessary to help maintain stable water conditions.
Hygger specifies a temperature-control accuracy of approximately ±2°F, making an independent thermometer useful for checking the actual aquarium temperature.
For best results, allow the water temperature to stabilize before making further adjustments.
ETL-Certified Safety and Protective Features
The Hygger HG998-100W incorporates several safety features designed to support reliable aquarium heating.
ETL-Certified Electrical Design
The HG998 heater series is ETL-certified, indicating that the product has been evaluated against applicable electrical safety requirements.
This certification provides additional reassurance when selecting an electrical heater intended for use in an aquarium environment.
Overheating Protection
The heater is designed to stop heating if the detected water temperature exceeds approximately 93°F (34°C).
This protective feature helps reduce the risk of excessive heating under abnormal operating conditions.
Dry-Run Safety Fuse
The HG998 includes an internal safety fuse designed to disconnect power if the heater remains outside water while operating for more than approximately three minutes.
This provides an additional layer of protection against unsafe operating conditions.
After a protective shutdown, the heater may require manual resetting according to the manufacturer's instructions.
Important: The dry-run safety fuse is an emergency protective feature. The heater must always be fully submerged before electrical power is connected.
Durable 2mm Quartz Glass Construction
The Hygger HG998-100W features a heating tube made from approximately 2mm-thick heat-resistant quartz glass.
This construction is designed to resist normal aquarium heating conditions while protecting the internal heating components.
The heater uses efficient heating wires and white alumina sand as a heat-conducting medium to help distribute warmth through the surrounding aquarium water.
Its slim black design allows it to blend discreetly into many aquarium backgrounds.
Although the glass is designed for durability, it should still be handled carefully to avoid cracks, impacts, or damage during installation and maintenance.
Do not position the heater where hard decorations, gravel, or rocks could strike or place pressure on the glass tube.
Included Digital Aquarium Thermometer
The Hygger HG998-100W includes a separate digital aquarium thermometer for monitoring actual water temperature.
The thermometer features a clear three-digit display with temperature readings to one decimal place.
Its measurement range is approximately 32°F–122°F (0°C–50°C), making it suitable for monitoring typical aquarium temperatures.
The thermometer is battery-powered and features a replaceable battery for continued use.
Its suction cup mounting allows convenient installation on the aquarium glass.
For more representative temperature readings, position the thermometer away from the heater's immediate heat output and in an area with suitable water circulation.
An independent thermometer helps aquarium owners verify that the water temperature matches the requirements of their fish, shrimp, plants, or other aquatic inhabitants.
Freshwater and Saltwater Compatibility
The Hygger HG998-100W is designed for use in both freshwater and saltwater aquarium environments.
This versatility makes it suitable for a wide range of aquatic setups where controlled heating is required.
In freshwater aquariums, it can help maintain temperatures suitable for tropical community fish, planted tanks, and other warm-water species.
In marine aquariums, it can provide supplemental heating for appropriately sized fish-only or reef systems, provided the heating requirements of the aquarium are within the unit's capacity.
Always choose the target temperature based on the specific livestock being kept rather than using a single temperature for every aquarium.
Suitable Aquarium Applications
The Hygger ETL Heater HG998-100W is suitable for compatible aquarium setups, including:
Freshwater aquariums up to 30 gallons
Tropical community fish tanks
Planted freshwater aquariums
Betta aquariums requiring additional heating capacity
Freshwater shrimp tanks where heating is appropriate
Small to medium saltwater aquariums
Fish-only marine aquarium systems
Aquarium setups requiring automatic thermostat control
Indoor aquariums affected by seasonal temperature changes
For optimal performance, ensure that the heater is correctly sized for the aquarium's actual water volume and surrounding room temperature.
Installation and Usage Guidelines
Inspect the heater: Check the quartz glass tube, power cord, plug, and mounting components for visible damage before installation.
Attach the suction cups: Secure the included mounting suction cups to the heater.
Choose a suitable position: Install the heater vertically or horizontally in an area with good water circulation, following the manufacturer's instructions.
Fully submerge the heater: Ensure the heater is completely underwater and the water level remains above the required minimum marking.
Set the desired temperature: Rotate the adjustment knob until the indicator aligns with the preferred temperature.
Connect electrical power: Once the heater is properly installed underwater, connect it to an appropriate electrical outlet.
Allow automatic heating: The thermostat will activate and deactivate the heating element as required.
Install the thermometer: Attach the digital thermometer to the aquarium glass using its suction cup.
Monitor water temperature: Confirm that the aquarium reaches and maintains the selected temperature.
Make gradual adjustments: Change the thermostat setting in small increments when necessary.
Important Safety and Maintenance Guidelines
Never switch on the heater before it is fully submerged.
Disconnect electrical power before aquarium water changes, cleaning, or moving the heater.
Allow the heater to cool before removing it from the water.
Never operate a heater with cracked glass or a damaged power cord.
Do not bury the heating element in gravel, sand, or aquarium decorations.
Position the heater where water can circulate freely around it.
Keep electrical connections dry and use a drip loop in the power cord.
Check the suction cups periodically to ensure the heater remains securely mounted.
Follow the manufacturer's safety and operating instructions at all times.
Product Specifications
Brand: Hygger
Product Name: ETL Certification Aquarium Heater
Model: HG998-100W
Series: HG998
Power Rating: 100W
Recommended Aquarium Capacity: Up to 30 gallons
Water Compatibility: Freshwater and saltwater
Heater Type: Fully submersible aquarium heater
Temperature Control Range: 68°F–93°F (20°C–34°C)
Temperature Control Accuracy: Approximately ±2°F
Temperature Adjustment: Rotary adjustment knob
Thermostat: Automatic on/off heating control
Heating Tube Material: Heat-resistant quartz glass
Glass Thickness: Approximately 2mm
Heating Medium: White alumina sand
Safety Features: ETL-certified design, overheating protection, and dry-run safety fuse
Overheating Cutoff: Approximately 93°F (34°C)
Dry-Run Protection: Internal safety fuse activates after approximately three minutes of out-of-water operation
Mounting: Two suction cups
Temperature Monitoring: Separate digital aquarium thermometer
Thermometer Measurement Range: 32°F–122°F (0°C–50°C)
Thermometer Display: Three-digit digital display with one-decimal-place readings
Thermometer Power: Replaceable battery
Color: Black
Primary Application: Temperature regulation in freshwater and marine aquariums
Specifications are based on Hygger's published HG998 product information. Confirm the voltage and electrical requirements of the supplied regional version before installation.
Package Includes
1 × Hygger HG998-100W Aquarium Heater
2 × Mounting Suction Cups
1 × Digital Aquarium Thermometer
1 × User Manual
Reliable Heating for Freshwater and Saltwater Aquariums
The Hygger ETL Heater HG998-100W is a practical choice for aquarium owners who want adjustable temperature control, automatic thermostat operation, and built-in safety protection.
With its 100W heating capacity, adjustable 68°F–93°F temperature range, durable 2mm quartz glass tube, ETL-certified construction, and included digital thermometer, this heater helps maintain comfortable conditions for suitable aquarium inhabitants.
Its freshwater and saltwater compatibility makes it a versatile heating solution for aquariums up to 30 gallons.
Order the Hygger HG998-100W ETL Aquarium Heater today and enjoy convenient, reliable temperature regulation for your aquatic environment.
Order processing time: 3–5 business days
Maintain a stable and comfortable aquatic environment with the Hygger ETL Heater HG998-100W, a fully submersible aquarium heater designed for freshwater and saltwater aquariums up to 30 gallons. Featuring adjustable temperature control, durable quartz glass construction, and built-in safety protection, this 100W aquarium heater provides convenient and consistent heating for tropical fish tanks, planted aquariums, and compatible marine setups.
The Hygger HG998-100W combines an easy-to-use rotary temperature adjustment knob with an automatic thermostat that switches the heating element on and off according to water temperature. Its adjustable temperature range of 68°F–93°F (20°C–34°C) allows aquarium owners to select appropriate conditions for a variety of temperature-sensitive aquatic inhabitants.
Built with a 2mm-thick quartz glass heating tube, ETL-certified electrical design, dual suction cup mounting, and an included digital thermometer, this aquarium heater offers a practical combination of heating performance, temperature monitoring, and protective features.
Benefits of the Hygger ETL Heater HG998-100W
100W Aquarium Heating: Designed for freshwater and saltwater aquariums up to 30 gallons.
ETL-Certified Design: Provides electrical safety certification for added confidence during aquarium use.
Adjustable Temperature Range: Set the desired temperature between 68°F and 93°F (20°C–34°C).
Automatic Thermostat Operation: Switches heating on and off to help maintain the selected temperature.
2mm-Thick Quartz Glass: Features a durable, heat-resistant heating tube.
Overheating Protection: Stops heating when the detected water temperature exceeds the heater's safety threshold.
Dry-Run Safety Fuse: Provides additional protection if the heater is operated outside water.
Easy Rotary Temperature Adjustment: Allows convenient temperature selection using a clearly marked adjustment knob.
Fully Submersible Construction: Designed for underwater operation in suitable aquarium installations.
Dual Suction Cup Mounting: Helps secure the heater inside the aquarium.
Freshwater and Saltwater Compatibility: Suitable for a variety of aquarium environments.
Included Digital Thermometer: Allows independent monitoring of actual aquarium water temperature.
Designed for Aquariums Up to 30 Gallons
The Hygger HG998-100W is the 100-watt model in Hygger's HG998 ETL-certified aquarium heater series.
According to Hygger's recommended sizing, the 100W model is suitable for aquariums with capacities of up to 30 gallons.
It provides a practical heating solution for medium-sized freshwater aquariums, tropical community tanks, planted aquariums, and appropriately sized saltwater systems.
Maintaining a consistent water temperature is important for many aquarium inhabitants because temperature fluctuations can affect fish metabolism, feeding behavior, and overall well-being.
The Hygger HG998-100W helps reduce unwanted temperature changes by automatically regulating its heating cycle according to the selected thermostat setting.
Actual heating performance depends on aquarium volume, ambient room temperature, water circulation, tank insulation, and the difference between room temperature and the desired aquarium temperature.
For aquariums kept in particularly cold environments, additional heating capacity may be necessary.
Adjustable Temperature Control from 68°F to 93°F
The Hygger HG998-100W features a rotary temperature adjustment knob that allows users to select a desired water temperature between 68°F and 93°F (20°C–34°C).
Simply rotate the knob until the indicator aligns with the preferred temperature on the adjustment scale.
Once the heater is correctly installed and fully submerged, its internal thermostat monitors the surrounding aquarium water.
When the water temperature falls below the selected setting, the heating element activates.
When the water reaches the desired temperature, the heater automatically stops heating.
This cycle repeats as necessary to help maintain stable water conditions.
Hygger specifies a temperature-control accuracy of approximately ±2°F, making an independent thermometer useful for checking the actual aquarium temperature.
For best results, allow the water temperature to stabilize before making further adjustments.
ETL-Certified Safety and Protective Features
The Hygger HG998-100W incorporates several safety features designed to support reliable aquarium heating.
ETL-Certified Electrical Design
The HG998 heater series is ETL-certified, indicating that the product has been evaluated against applicable electrical safety requirements.
This certification provides additional reassurance when selecting an electrical heater intended for use in an aquarium environment.
Overheating Protection
The heater is designed to stop heating if the detected water temperature exceeds approximately 93°F (34°C).
This protective feature helps reduce the risk of excessive heating under abnormal operating conditions.
Dry-Run Safety Fuse
The HG998 includes an internal safety fuse designed to disconnect power if the heater remains outside water while operating for more than approximately three minutes.
This provides an additional layer of protection against unsafe operating conditions.
After a protective shutdown, the heater may require manual resetting according to the manufacturer's instructions.
Important: The dry-run safety fuse is an emergency protective feature. The heater must always be fully submerged before electrical power is connected.
Durable 2mm Quartz Glass Construction
The Hygger HG998-100W features a heating tube made from approximately 2mm-thick heat-resistant quartz glass.
This construction is designed to resist normal aquarium heating conditions while protecting the internal heating components.
The heater uses efficient heating wires and white alumina sand as a heat-conducting medium to help distribute warmth through the surrounding aquarium water.
Its slim black design allows it to blend discreetly into many aquarium backgrounds.
Although the glass is designed for durability, it should still be handled carefully to avoid cracks, impacts, or damage during installation and maintenance.
Do not position the heater where hard decorations, gravel, or rocks could strike or place pressure on the glass tube.
Included Digital Aquarium Thermometer
The Hygger HG998-100W includes a separate digital aquarium thermometer for monitoring actual water temperature.
The thermometer features a clear three-digit display with temperature readings to one decimal place.
Its measurement range is approximately 32°F–122°F (0°C–50°C), making it suitable for monitoring typical aquarium temperatures.
The thermometer is battery-powered and features a replaceable battery for continued use.
Its suction cup mounting allows convenient installation on the aquarium glass.
For more representative temperature readings, position the thermometer away from the heater's immediate heat output and in an area with suitable water circulation.
An independent thermometer helps aquarium owners verify that the water temperature matches the requirements of their fish, shrimp, plants, or other aquatic inhabitants.
Freshwater and Saltwater Compatibility
The Hygger HG998-100W is designed for use in both freshwater and saltwater aquarium environments.
This versatility makes it suitable for a wide range of aquatic setups where controlled heating is required.
In freshwater aquariums, it can help maintain temperatures suitable for tropical community fish, planted tanks, and other warm-water species.
In marine aquariums, it can provide supplemental heating for appropriately sized fish-only or reef systems, provided the heating requirements of the aquarium are within the unit's capacity.
Always choose the target temperature based on the specific livestock being kept rather than using a single temperature for every aquarium.
Suitable Aquarium Applications
The Hygger ETL Heater HG998-100W is suitable for compatible aquarium setups, including:
Freshwater aquariums up to 30 gallons
Tropical community fish tanks
Planted freshwater aquariums
Betta aquariums requiring additional heating capacity
Freshwater shrimp tanks where heating is appropriate
Small to medium saltwater aquariums
Fish-only marine aquarium systems
Aquarium setups requiring automatic thermostat control
Indoor aquariums affected by seasonal temperature changes
For optimal performance, ensure that the heater is correctly sized for the aquarium's actual water volume and surrounding room temperature.
Installation and Usage Guidelines
Inspect the heater: Check the quartz glass tube, power cord, plug, and mounting components for visible damage before installation.
Attach the suction cups: Secure the included mounting suction cups to the heater.
Choose a suitable position: Install the heater vertically or horizontally in an area with good water circulation, following the manufacturer's instructions.
Fully submerge the heater: Ensure the heater is completely underwater and the water level remains above the required minimum marking.
Set the desired temperature: Rotate the adjustment knob until the indicator aligns with the preferred temperature.
Connect electrical power: Once the heater is properly installed underwater, connect it to an appropriate electrical outlet.
Allow automatic heating: The thermostat will activate and deactivate the heating element as required.
Install the thermometer: Attach the digital thermometer to the aquarium glass using its suction cup.
Monitor water temperature: Confirm that the aquarium reaches and maintains the selected temperature.
Make gradual adjustments: Change the thermostat setting in small increments when necessary.
Important Safety and Maintenance Guidelines
Never switch on the heater before it is fully submerged.
Disconnect electrical power before aquarium water changes, cleaning, or moving the heater.
Allow the heater to cool before removing it from the water.
Never operate a heater with cracked glass or a damaged power cord.
Do not bury the heating element in gravel, sand, or aquarium decorations.
Position the heater where water can circulate freely around it.
Keep electrical connections dry and use a drip loop in the power cord.
Check the suction cups periodically to ensure the heater remains securely mounted.
Follow the manufacturer's safety and operating instructions at all times.
Product Specifications
Brand: Hygger
Product Name: ETL Certification Aquarium Heater
Model: HG998-100W
Series: HG998
Power Rating: 100W
Recommended Aquarium Capacity: Up to 30 gallons
Water Compatibility: Freshwater and saltwater
Heater Type: Fully submersible aquarium heater
Temperature Control Range: 68°F–93°F (20°C–34°C)
Temperature Control Accuracy: Approximately ±2°F
Temperature Adjustment: Rotary adjustment knob
Thermostat: Automatic on/off heating control
Heating Tube Material: Heat-resistant quartz glass
Glass Thickness: Approximately 2mm
Heating Medium: White alumina sand
Safety Features: ETL-certified design, overheating protection, and dry-run safety fuse
Overheating Cutoff: Approximately 93°F (34°C)
Dry-Run Protection: Internal safety fuse activates after approximately three minutes of out-of-water operation
Mounting: Two suction cups
Temperature Monitoring: Separate digital aquarium thermometer
Thermometer Measurement Range: 32°F–122°F (0°C–50°C)
Thermometer Display: Three-digit digital display with one-decimal-place readings
Thermometer Power: Replaceable battery
Color: Black
Primary Application: Temperature regulation in freshwater and marine aquariums
Specifications are based on Hygger's published HG998 product information. Confirm the voltage and electrical requirements of the supplied regional version before installation.
Package Includes
1 × Hygger HG998-100W Aquarium Heater
2 × Mounting Suction Cups
1 × Digital Aquarium Thermometer
1 × User Manual
Reliable Heating for Freshwater and Saltwater Aquariums
The Hygger ETL Heater HG998-100W is a practical choice for aquarium owners who want adjustable temperature control, automatic thermostat operation, and built-in safety protection.
With its 100W heating capacity, adjustable 68°F–93°F temperature range, durable 2mm quartz glass tube, ETL-certified construction, and included digital thermometer, this heater helps maintain comfortable conditions for suitable aquarium inhabitants.
Its freshwater and saltwater compatibility makes it a versatile heating solution for aquariums up to 30 gallons.
Order the Hygger HG998-100W ETL Aquarium Heater today and enjoy convenient, reliable temperature regulation for your aquatic environment.
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