1. Product Overview
The Aqueon Pro Adjustable Heater 100W is designed for precise temperature control in freshwater and saltwater aquariums. Its durable, non-corrosive shell ensures strength and even heat distribution. An electronic thermostat provides accurate temperature settings and enhanced safety features.

Image 1.1: Aqueon Pro Adjustable Heater 100W, showing its sleek, black design.
Key Features:
- Adjustable heat setting from 68°F to 88°F (20°C to 31°C).
- Electronic thermostat accurate to +/- 1°F.
- Shatterproof and highly durable construction.
- Fully submersible design.
- Automatic shut-off feature if overheating occurs, with automatic reset upon cooling.
- LED power indicator: red when heating, green when the set temperature is reached.
- Suitable for both freshwater and saltwater aquariums.
2. Important Safety Instructions
Please read and follow all safety instructions to prevent injury or product damage.
- Always unplug the heater from the power outlet before performing any maintenance, cleaning, or water changes in the aquarium.
- Ensure the heater is fully submerged in water at all times during operation. Operating the heater out of water can cause overheating and poses a fire hazard.
- Do not operate the heater if the cord or plug is damaged.
- Do not attempt to repair the heater yourself. Refer to the warranty section for service information.
- Keep out of reach of children.
- Ensure the heater's wattage is appropriate for your aquarium size to avoid insufficient heating or excessive power consumption. Refer to the specifications section for guidance.
3. Package Contents
Verify that all items are present in the package:
- Aqueon Pro Adjustable Heater 100W
- Suction Cups (typically two for secure mounting)
4. Setup Guide
4.1 Placement
The Aqueon Pro Heater can be positioned either horizontally or vertically within the aquarium. Vertical placement is generally preferred for optimal heat distribution.
4.2 Mounting
Attach the provided suction cups to the heater and then firmly press them against the inside glass of your aquarium. Ensure both suction cups are used for secure attachment and to prevent rotation.
4.3 Water Level
The heater must be fully submerged. Ensure the water level in your aquarium is above the minimum water level indicator on the heater. Operating the heater partially submerged or out of water will cause it to overheat and potentially fail.

Image 4.1: Diagram illustrating the minimum water level and suction cup placement for the heater.
4.4 Initial Temperature Setting
Before plugging in the heater, rotate the blue adjustment knob to your desired temperature setting. It is recommended to start with a moderate temperature, such as 76°F (24°C), and adjust as needed after monitoring the aquarium temperature for several hours.
5. Operation
5.1 Adjusting Temperature
To adjust the temperature, simply rotate the blue knob located at the top of the heater. The temperature scale is marked in Fahrenheit. Allow several hours for the aquarium water to stabilize at the new setting before making further adjustments. Always use an external thermometer to verify the actual water temperature.

Image 5.1: The Aqueon Pro Heater showing the blue temperature adjustment knob.

Image 5.2: Close-up view of the temperature adjustment knob with temperature markings.
5.2 Indicator Light
The heater features an LED indicator light that provides visual feedback on its operational status:
- Red Light: Indicates the heater is actively heating the water.
- Green Light: Indicates the heater has reached the set temperature and is maintaining it.

Image 5.3: The Aqueon Pro Heater displaying a red indicator light, signifying active heating.
6. Maintenance
Regular maintenance ensures optimal performance and longevity of your heater.
- Cleaning: Over time, algae and hard water deposits may accumulate on the heater's surface. Unplug the heater and allow it to cool completely before carefully removing it from the aquarium for cleaning. Use a soft brush or cloth to gently wipe away any buildup. Avoid using harsh chemicals or abrasive materials.
- Inspection: Periodically inspect the heater for any signs of damage, such as cracks in the casing or fraying of the power cord. If any damage is observed, discontinue use immediately and refer to the warranty information.
- Water Level: Always ensure the water level remains above the minimum line. Evaporation can lower the water level, potentially exposing the heater.
7. Troubleshooting
Refer to the table below for common issues and their solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Heater not heating (no red light) | Not plugged in; power outage; heater in overheat protection mode; faulty unit. | Check power connection; verify power supply; ensure heater is fully submerged and has cooled down to reset; if problem persists, contact support. |
| Aquarium temperature is too low/high | Incorrect temperature setting; heater wattage insufficient for tank size; inaccurate external thermometer. | Adjust temperature knob; ensure correct wattage for tank (refer to guidelines); verify external thermometer accuracy with a calibrated device. |
| Heater shell appears damaged or split | Physical damage; material fatigue. | Immediately unplug the heater. Do not use. Contact Aqueon customer support for warranty claim or replacement. |
8. Technical Specifications
Detailed specifications for the Aqueon Pro Adjustable Heater 100W.
| Specification | Detail |
|---|---|
| Model Number | 100106106 |
| Wattage | 100W |
| Temperature Range | 68°F to 88°F (20°C to 31°C) |
| Temperature Accuracy | +/- 1°F |
| Dimensions (100W) | Approximately 10.3 inches (length) |
| Item Weight | 0.6 Pounds (approx. 9.6 ounces) |
| Submersible | Fully submersible |
| Material | Durable, non-corrosive shell (not glass) |
| Country of Origin | Italy |
8.1 Heater Wattage Guidelines
Use the following table to determine the appropriate heater wattage for your aquarium size, based on standard room temperature of 68°F-72°F.

Image 8.1: Aqueon Heater Guidelines for selecting appropriate wattage based on aquarium size and desired temperature increase.
9. Warranty and Support
9.1 Limited Lifetime Warranty
The Aqueon Pro Adjustable Heater is backed by a Limited Lifetime Warranty against defects in materials and workmanship. Please retain your proof of purchase for warranty claims. The warranty does not cover damage resulting from misuse, improper installation, or normal wear and tear.
9.2 Customer Support
For technical assistance, warranty claims, or product inquiries, please contact Aqueon customer support. Contact information can typically be found on the Aqueon official website or product packaging.
Manufacturer: Central Garden & Pet





