Introduction
Welcome to the instruction manual for your Eheim Jager Aquarium Thermostat Heater 300W. This heater is engineered to provide precise and stable temperature control for your aquarium, creating an optimal environment for your aquatic inhabitants. It features a TruTemp dial for accurate calibration and is designed for full submersion.
Important Safety Instructions
Please read and understand all safety instructions before operating this device. Failure to follow these instructions may result in damage to the product, injury, or electrical shock.
- Always ensure the heater is fully submerged in water before connecting it to a power source.
- Unplug the heater from the electrical outlet before performing any maintenance, water changes, or when handling the heater.
- Do not operate the heater if the power cord or the heater itself shows any signs of damage.
- This product is designed for indoor use only, specifically for aquariums.
- Keep the heater out of reach of children.
- The heater is constructed from shock-resistant and shatter-proof glass, suitable for both fresh and marine water environments.
- The integrated Thermo safety control protects the heater from damage if it runs dry due to low water levels.
Package Contents
Verify that all components are present in the package:
- Eheim Jager Aquarium Thermostat Heater (300W)
- Suction cups for mounting
Setup and Installation
Placement
The Eheim Jager heater is designed to be fully submersible. For optimal heat distribution throughout your aquarium, position the heater vertically in an area with good water circulation, such as near the outlet of your aquarium filter.
Image: Eheim Jager Aquarium Thermostat Heater 300W with its packaging.
Mounting
Attach the provided suction cups to the heater and securely fasten it to the inside wall of your aquarium. It is crucial that the heater is completely submerged in water at all times during operation.
Connecting to Power
Once the heater is securely mounted and fully submerged, connect the power plug to a suitable electrical outlet. The on/off indicator light on the heater will illuminate when the unit is actively heating the water.
Operating Instructions
Setting the Temperature
The Eheim Jager heater features a TruTemp dial for precise temperature adjustment:
- Use an independent aquarium thermometer to accurately measure your tank's current water temperature.
- Adjust the dial located on the top of the heater to your desired temperature setting.
- Allow several hours for the water temperature to stabilize, then re-check the temperature with your external thermometer.
- If necessary, recalibrate the heater using the TruTemp dial. This feature allows for fine-tuning the temperature within a +/- 0.5°F accuracy.
Note: The initial temperature settings indicated on the dial may not perfectly correspond to the actual water temperature. Always verify the temperature with an independent thermometer for accuracy.
On/Off Indicator Light
A built-in indicator light provides visual confirmation of the heater's operational status. The light illuminates when the heater is actively heating the water, allowing for easy at-a-glance monitoring.
Maintenance
Cleaning
Regularly inspect the heater for any accumulation of algae or mineral deposits. Keeping the heater clean ensures efficient operation.
- Always unplug the heater and allow it to cool completely before removing it from the aquarium.
- Gently wipe the glass tube with a soft cloth or sponge. Avoid using abrasive cleaners or harsh chemicals.
- For stubborn mineral deposits, a mild vinegar solution can be used. After cleaning, thoroughly rinse the heater with clean water.
- Ensure the heater is completely dry before re-installing it into the aquarium.
Inspection
Periodically check the power cord and the heater's glass body for any signs of damage, such as cracks, fraying, or wear. If any damage is observed, discontinue use immediately and replace the heater to prevent potential hazards.
Troubleshooting
Refer to the table below for common issues and their potential solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Heater not turning on | No power; Heater not fully submerged; Faulty unit | Check power connection; Ensure full submersion; Contact support if the unit is new and unresponsive. |
| Water temperature too high/low | Incorrect temperature setting; Heater wattage unsuitable for tank size; Heater malfunction | Adjust temperature dial and verify with an external thermometer; Ensure heater wattage matches tank volume; Contact support if issues persist. |
| Heater light not illuminating | Heater not actively heating (temperature reached); Power issue; Indicator bulb failure | Check water temperature with an external thermometer; Verify power supply; The heater may still be functional even if the light is off if the desired temperature is maintained. |
| Heater running dry protection activated | Water level too low in the aquarium | Add water to the aquarium to ensure the heater is fully submerged. The heater will automatically resume operation once submerged. |
If these troubleshooting steps do not resolve the issue, please refer to the warranty and customer support information provided in this manual.
Technical Specifications
Detailed specifications for the Eheim Jager Aquarium Thermostat Heater 300W:
| Feature | Detail |
|---|---|
| Model Number | 3619090 |
| Wattage | 300 Watts |
| Recommended Tank Size | 159-264 Gallons |
| Dimensions (Length x Diameter) | 19.92 inches x 1.42 inches (approximately 20" x 1.4") |
| Item Weight | 13.19 ounces |
| Material | Shock-resistant, shatter-proof glass |
| Submersibility | Fully submersible |
| Safety Features | Thermo safety control (dry run protection) |
| Temperature Calibration | TruTemp dial, +/- 0.5°F accuracy |
Image: Eheim Jager Aquarium Thermostat Heater with approximate dimensions shown.
Warranty and Customer Support
Warranty Information
The manufacturer's warranty for the Eheim Jager Aquarium Thermostat Heater is provided by Eheim. For detailed terms, conditions, and duration of the warranty, please refer to the official Eheim website or the documentation included with your purchase.
Customer Support
For technical assistance, inquiries regarding replacement parts, or to initiate a warranty claim, please contact Eheim customer support. You can typically find contact information on the official Eheim website (www.eheim.com) or through authorized Eheim distributors.
