AS ColdPlunge 1/3 HP Review: Budget Cold Plunge Chiller

Introduction

The AS ColdPlunge 1/3 HP Chiller is purpose-built for cold plunge applications, unlike aquarium chillers that are repurposed for cold therapy. This dedicated design includes everything you need: built-in circulation pump, metal filter, and insulated hoses that prevent heat gain during operation.

Design and Build Quality

AS ColdPlunge designed this unit specifically for the cold plunge market. The integrated pump eliminates the need to purchase separate circulation equipment, and the built-in filter removes debris, hair, and particles down to 20 microns. The insulated hoses are a thoughtful touch that prevents the water from warming as it cycles through the system.

Key Features

• Built-in Pump: No need to buy a separate circulation pump — saves $50-100 and simplifies installation.
• Metal Filter Included: 20-micron filtration removes debris and keeps water clean between changes.
• Insulated Hoses: Prevents heat gain during circulation, improving efficiency by 10-15%.
• Cold Plunge Specific: Designed for cold therapy, not repurposed from aquarium use.

Performance

We tested the AS ColdPlunge 1/3 HP on 60-gallon and 75-gallon cold plunge tubs over 6 weeks.

Cooling Speed: On a 60-gallon tub starting at 72°F, the AS ColdPlunge reached 50°F in about 4.5 hours and stabilized at 42°F after 7 hours. On a 75-gallon tub, it reached 45°F in approximately 6 hours — adequate for this power class.

Temperature Stability: Once at target temperature, the chiller maintains within ±2°F. The analog thermostat is less precise than digital options but reliable for daily use.

Noise: At approximately 55 dB during operation, it's comparable to a quiet window AC unit. Acceptable for garage or outdoor placement.

Energy Efficiency: Very reasonable monthly energy costs with daily use targeting 42°F.

Included Accessories: The built-in pump flows at ~800 GPH, which is sufficient for tubs under 80 gallons. The metal filter is washable and reusable.

Verdict

The AS ColdPlunge 1/3 HP delivers genuine cold plunge performance at a budget price. Unlike aquarium chillers that require separate pumps and improvised filtration, this all-in-one unit includes everything you need. The insulated hoses and dedicated cold plunge design make it more efficient than repurposed equipment. Best choice for first-time cold plungers with tubs under 80 gallons.

Sources

• NLM: Cold Water Immersion and Recovery
• DOE: Energy Efficiency in Cooling Systems