EcoPlus Water Chillers – 1/10 HP Chiller

The EcoPlus 1/10 HP Water Chiller is a compact refrigeration unit designed to lower and hold reservoir temperatures in hydroponic systems, freshwater aquariums, and saltwater tanks. It uses a titanium heat exchanger for corrosion resistance and a reliable compressor for consistent cooling, with a micro-computer and digital LCD display for straightforward temperature control.

EcoPlus 1/10 HP Chiller Specifications

All specifications below are sourced from the manufacturer’s product documentation for the 1/10 HP model (SKU HGC728695).

Specification	Value
Horsepower	1/10 HP
Voltage / Frequency	120 V / 60 Hz
Power Draw	264 W / 2.2 Amps
Fitting Size	1/2 in.
Compatible Pump Flow Rate	Minimum 66 GPH / Maximum 317 GPH
Dimensions (W × D × H)	15.75 in. × 8.58 in. × 16.34 in.
Weight	28.7 lb
Heat Exchanger Material	Titanium
Display	Digital LCD with micro-computer controller
SKU	HGC728695

Why Choose the EcoPlus 1/10 HP Water Chiller

Water temperature is one of the most overlooked variables in hydroponic growing. Roots absorb oxygen most efficiently between roughly 65°F and 72°F. Above that range, dissolved oxygen levels drop, beneficial microbial activity shifts, and plants become more susceptible to root pathogens. A dedicated chiller is the most reliable way to hold reservoir temperatures in that window regardless of ambient room temperature or lighting heat load.

The EcoPlus 1/10 HP chiller is sized for small-to-mid residential systems — typically reservoirs up to 30–50 gallons depending on ambient conditions — where a full-size commercial chiller would be over-engineered and a frozen-bottle approach is impractical. Several design choices make it a practical pick for growers at this scale:

• Titanium heat exchanger: Titanium resists corrosion from nutrient solutions, saltwater, and pH-adjusted water. Stainless or copper coils can leach ions into the water over time; titanium does not. This matters both for plant health and chiller longevity.
• Micro-computer with digital LCD display: The built-in controller lets you set a target temperature and a differential (hysteresis). The compressor cycles on and off automatically to hold that setpoint. There is no need for a separate controller or thermostat.
• Standard 1/2 in. fittings: The 1/2 in. barb or threaded fittings connect to common 1/2 in. ID tubing used in most small hydroponic and aquarium recirculating systems without adapters.
• Compact footprint: At 15.75 in. wide and 16.34 in. tall, the unit fits on a standard shelf or floor space next to a grow tent or cabinet without requiring dedicated equipment rack space.
• Suitable for freshwater and saltwater: The titanium exchanger makes the unit safe for reef and saltwater aquarium applications as well as hydroponic nutrient solutions, giving it flexibility across different grow and tank setups.

The EcoPlus line is a Hydrofarm distribution brand, meaning these chillers move through established hydroponic distribution channels and are stocked at most major hydroponic retailers. Parts and replacement fittings are generally available through the same channels.

Best Uses for the EcoPlus 1/10 HP Water Chiller

This chiller is designed for applications where reservoir water temperature needs active management. The following use cases reflect the environments described in the manufacturer documentation.

• Deep water culture (DWC) and recirculating deep water culture (RDWC): DWC systems are highly sensitive to reservoir temperature because roots are submerged continuously. Maintaining water below 72°F suppresses pythium and other root rot pathogens. The 1/10 HP unit handles single-bucket and small multi-bucket DWC reservoirs where the water volume is manageable for this capacity.
• Nutrient film technique (NFT) and drip irrigation reservoirs: In warm grow rooms or during summer months, central reservoirs in NFT and drip systems can climb into ranges that reduce dissolved oxygen. Inline chilling through a recirculating pump loop keeps feed temperatures consistent.
• Small freshwater aquariums: The chiller is rated for freshwater aquarium use. Planted aquariums with CO2 injection and high lighting often accumulate heat; active chilling prevents stress on temperature-sensitive fish and plant species.
• Saltwater and reef aquariums: The titanium heat exchanger is safe for saltwater. Reef systems with metal halide or intense LED lighting often need chilling during summer. The 1/10 HP capacity suits smaller reef tanks where a larger chiller would be oversized.
• Propagation and clone reservoirs: Clone and seedling stages benefit from precise temperature control. Cooler water encourages root initiation in aeroponic and DWC propagation setups.

EcoPlus 1/10 HP vs the EcoPlus 1/4 HP Chiller

EcoPlus offers the same chiller platform in three capacities: 1/10 HP, 1/4 HP, and 1/2 HP. All three share the same titanium heat exchanger design and micro-computer LCD controller. The difference is cooling capacity and the resulting reservoir volume each unit can practically manage.

The 1/10 HP model (this unit) uses 1/2 in. fittings, draws 264 W at 2.2 amps, and requires a pump delivering between 66 and 317 GPH. Its physical size is 15.75 in. × 8.58 in. × 16.34 in. and it weighs 28.7 lb. It is the right choice for small systems: single DWC buckets, reservoirs up to roughly 30–50 gallons, and compact aquariums.

The 1/4 HP model steps up to 3/4 in. fittings, draws 360 W at 3 amps, and needs a pump in the 264–660 GPH range. Its larger chassis (17.13 in. × 11.61 in. × 18.5 in., 42.5 lb) handles mid-size systems: 4–8 bucket RDWC rigs, 50–100 gallon reservoirs, and medium aquariums.

The 1/2 HP model handles up to 132 gallons, uses 3/4 in. fittings at 4.4 amps, and suits commercial-scale reservoirs and large reef systems.

If your reservoir is under 40 gallons and your grow room stays below 80°F, the 1/10 HP is typically sufficient. For larger systems or warmer environments, the 1/4 HP is the next step up. Sizing a chiller too small for the heat load will cause the compressor to run continuously without reaching setpoint, shortening its service life.

Compatibility

The EcoPlus 1/10 HP chiller is compatible with the following systems and setups:

• Electrical: Requires a standard 120V / 60Hz grounded outlet. The unit draws 2.2 amps at 264 W, well within the capacity of a standard 15-amp household circuit. A dedicated circuit is not required at this draw level, but avoid sharing with high-draw equipment on the same circuit breaker.
• Plumbing: Connects via 1/2 in. fittings. Standard 1/2 in. ID vinyl or silicone tubing fits directly. Use hose clamps on barb fittings to prevent leaks under pump pressure.
• Pump requirements: Requires an external water pump delivering between 66 GPH (minimum) and 317 GPH (maximum) to circulate water through the heat exchanger. Flow below the minimum reduces cooling efficiency; flow above the maximum can reduce contact time and cooling effectiveness. A pump flow rate near the middle of the range — around 150–200 GPH — is a practical target for most applications. The manufacturer recommends using a pump filter bag (EcoPlus product #728188 or #728190) to protect the heat exchanger from debris.
• Water types: Compatible with fresh water, saltwater, and nutrient-enriched hydroponic solutions. The titanium heat exchanger does not react with nutrient salts or marine chemistry.
• System types: Works inline in any recirculating system — DWC, RDWC, NFT, ebb-and-flow, drip, and aquarium sump loops. The chiller is plumbed in series on the return line from the pump so cooled water flows back into the reservoir.

For high-quality aeration alongside your chilled reservoir, an Active Aqua air pump paired with air stones keeps dissolved oxygen levels high in the cooled water. If your source water contains chloramines or high mineral content, running it through a Hydro-Logic Micro 75 GPD reverse osmosis system before it enters the reservoir reduces the load on the chiller and improves water quality for roots.

Usage Guidelines

Operating a water chiller effectively requires matching the chiller to the system volume, setting an appropriate temperature target, and maintaining clean water flow through the heat exchanger. The following guidelines are derived from the manufacturer documentation and standard practices for inline hydroponic chillers.

• Target temperature: Set the chiller’s target (setpoint) temperature to the desired reservoir temperature. For most hydroponic crops, 65°F–72°F (18°C–22°C) is the recommended range. For marine aquariums, match the species-specific range for your livestock.
• Differential (hysteresis): The micro-computer controller uses a differential setting to determine when the compressor cycles on and off. A differential of 1–2°F is common. Narrower differentials cause more frequent compressor cycling; wider differentials allow more temperature swing but extend compressor off-time. Consult the included manual for the specific setting procedure for this unit.
• Pump filter: Always use a pump filter bag (EcoPlus #728188 or #728190) on the inlet pump to prevent particulate matter from entering the titanium heat exchanger. Clogged exchangers reduce cooling efficiency and can cause the compressor to overheat.
• Ambient temperature: Chillers exhaust heat into the surrounding air. Ensure the chiller is placed in a ventilated area. In a closed grow tent with no exhaust, the heat dumped by the chiller will raise ambient temperature. Most growers position the chiller outside the tent or in the equipment room.
• Run-in period: After initial installation, allow the reservoir temperature to stabilize over several hours before adjusting the setpoint. Chiller capacity ratings assume steady-state operation, not pulling temperature down rapidly from a high starting point.

How to Install the EcoPlus Water Chiller

1. Position the chiller: Place the unit on a stable, level surface near the reservoir. Allow at least 6 in. of clearance on all sides for airflow around the condenser. Do not place the chiller inside an enclosed grow tent where heat exhaust cannot escape.
2. Install the pump filter bag: Attach an EcoPlus pump filter bag (#728188 or #728190) to the submersible pump that will circulate water through the chiller. This protects the titanium heat exchanger from debris and root particles.
3. Connect the inlet tubing: Run 1/2 in. ID tubing from the outlet of your submersible pump (or from a dedicated chiller pump in the reservoir) to the inlet fitting on the chiller. Secure with a hose clamp.
4. Connect the outlet tubing: Run 1/2 in. ID tubing from the chiller’s outlet fitting back to the reservoir. The cooled water discharges here. Secure with a hose clamp.
5. Verify pump flow rate: Confirm the pump delivering water to the chiller is rated between 66 GPH and 317 GPH. If the pump moves water outside this range, the chiller’s cooling performance will be reduced.
6. Plug in and power on: Connect the chiller to a grounded 120V / 60Hz outlet. Use the LCD controller to set your target temperature and differential. The display will show current water temperature and the compressor will engage when the water exceeds the setpoint.
7. Check for leaks: With the pump running, inspect all tubing connections at the fittings for drips. Tighten hose clamps as needed. Allow 15–30 minutes of operation before leaving the system unattended for the first time.
8. Monitor and adjust: Check the display readout after 1–2 hours of operation to confirm the reservoir is reaching the target temperature. If the compressor runs continuously without reaching setpoint, the ambient temperature may be too high or the system volume may exceed the chiller’s capacity — consider upgrading to the 1/4 HP model.

Sources & Further Reading