Introduction
The Active Aqua 0.25 HP Water Chiller (Model AACH25HP) is designed to provide consistent, chilled water for various applications, including hydroponic systems, aquariums, aquaponics, and cold plunge baths. This unit ensures precise temperature control for optimal plant growth, aquatic health, or cold therapy. It features an innovative Boost function for rapid cooling and is built with an anti-corrosive pure titanium evaporator, making it suitable for both fresh and saltwater environments.
Key Features
- Rapid Cooling with Boost Function: Accelerates the chilling process for quick temperature establishment in nutrient solutions, aquariums, or cold baths.
- Efficient Temperature Control: User-friendly interface allows precise temperature range adjustments for superior plant growth and aquatic vitality.
- Versatile Applications: Ideal for hydroponic systems, aquaponic reservoirs, aquariums, and cold plunge baths, supporting setups between 40 to 92 gallons.
- Reliable Power and Efficiency: Features a 0.25 HP motor (396-925 gallons per hour) and is compatible with AAPW400, AAPW550, and AAPW800 pumps.
- Durable Construction: Engineered with an anti-corrosive pure titanium evaporator for long-term durability in both fresh and saltwater environments.
Product Overview



Official Product Video
This video provides an overview of the Active Aqua Hydroponic Cooling Water Chiller, highlighting its design and functionality.
Setup and Installation
The Active Aqua Water Chiller is designed for straightforward installation. Ensure the unit is placed on a stable, level surface with adequate ventilation around all sides. The chiller requires an external pump and hoses for operation, which are not included with the unit.
Connection Steps:
- Prepare Fittings: The chiller includes 0.5-inch and 0.75-inch fittings. Select the appropriate size for your pump and reservoir hoses.
- Connect Hoses: Attach the 'IN' hose from your pump (drawing water from the reservoir) to the chiller's 'IN' port. Connect the 'OUT' hose from the chiller's 'OUT' port back to your reservoir. Secure all connections with clamps to prevent leaks.
- Position Pump: Place your external water pump in the reservoir, ensuring it is fully submerged and can circulate water effectively.
- Power Connection: Plug the chiller into a grounded electrical outlet.
- Initial Water Circulation: Before turning on the chiller, ensure the pump is running and water is circulating through the chiller unit to prime the system and remove any air.
It is recommended to allow the chiller to sit upright for several hours after transport before initial operation to allow refrigerants to settle.
Operation
The chiller features an easy-to-use control panel for setting and monitoring water temperature.

Temperature Setting:
- Use the 'SET' button to enter temperature adjustment mode.
- Use the Up and Down arrow buttons to select your desired water temperature.
- Press 'SET' again to confirm the new temperature. The unit will automatically work to maintain this set temperature.
Boost Function:
The 'BOOST' function accelerates the chilling process, useful for quickly lowering the water temperature, especially when starting with warmer water or after adding fresh water. This function can be activated for a 2-hour expedited maximum chilling period or set for continuous 24/7 operation.
- Press the 'BOOST' button to activate the rapid chilling mode.
- Observe the indicator lights on the control panel to confirm the selected Boost mode (2 hours or 24/7).
Power On/Off:
Use the 'POWER' button on the control panel to turn the unit on or off. A separate main power switch may also be located on the side of the unit.
Maintenance
Regular maintenance ensures optimal performance and longevity of your Active Aqua Water Chiller.
- Cleaning: Periodically clean the exterior of the unit and ensure the air intake and exhaust vents are free from dust and debris to maintain efficient airflow.
- Check Connections: Regularly inspect all hose connections for leaks and ensure they are securely fastened.
- Water Quality: Maintain good water quality in your reservoir to prevent buildup and ensure efficient heat exchange. The anti-corrosive pure titanium evaporator is designed for durability in various water types.
Specifications
| Feature | Detail |
|---|---|
| Model Number | AACH25HP |
| Horsepower | 0.25 HP (1/4 HP) |
| Recommended Reservoir Size | 40-92 Gallons |
| BTU per Hour | 3,010 BTU/hr |
| Wattage | 460 Watts |
| Amperage | 4.7 Amps |
| Voltage | 120V |
| Evaporator Material | Pure Titanium (Anti-corrosive) |
| Fittings Included | 0.5-inch and 0.75-inch |
| Dimensions (L x W x H) | 20.7" x 17.9" x 20.5" |
| Weight | 50 pounds |
| Color | Black |
Warranty and Support
The Active Aqua 0.25 HP Water Chiller is backed by a 1-year manufacturer warranty. For warranty claims or technical support, please refer to the contact information provided in your product packaging or visit the official Active Aqua website.