The Ultimate DIY Cold Plunge Tub Guide: Build Your Own At-Home Cold Therapy Station

Why Cold Plunge Therapy is Worth the Hype

Cold water immersion is a time-tested recovery method known for reducing inflammation, improving circulation, boosting mood, and accelerating muscle repair. With growing interest in wellness and recovery, building a DIY cold plunge tub at home has become one of the most affordable ways to reap these benefits daily—without breaking the bank.

How a Cold Plunge Tub Works

A cold plunge tub is a temperature-regulated bath designed to maintain icy-cold water between 37°F–55°F. Most systems include a chiller, pump, filtration system, and tub. The goal is to keep the water circulating and clean while staying consistently cold.

DIY Cold Plunge Tub Essentials

Basic Components

• Tub or container: Large stock tanks, horse troughs, or even deep coolers
• Filtration system: To keep water clean (filter & pump combo)
• Water chiller: Keeps the water cold and stable
• Hose fittings & connectors: For clean plumbing
• Insulation: Optional but helpful for outdoor setups

Recommended DIY Cold Plunge Kits

• EcoPlus DIY Cold Plunge 1/4 HP Starter Kit – Ideal for small home setups
• EcoPlus 1/2 HP Starter Kit – Balanced cooling and circulation
• EcoPlus 1 HP Starter Kit – Great for medium tanks and outdoor setups
• EcoPlus 1.5 HP Starter Kit – Powerful enough for commercial-style builds

Step-by-Step: How to Build a Cold Plunge Tub at Home

Step 1: Choose Your Tub

Most DIYers opt for a 100-gallon stock tank or insulated ice chest. For portability, look for something lightweight and non-metallic. Horse troughs work well for affordability and size.

Step 2: Set Up the Pump & Filter

Install your pump and filter to circulate and clean the water. Choose a system designed for continuous outdoor use. We recommend using a bundled option like the EcoPlus kits that include plumbing accessories.

Step 3: Add the Chiller

Connect your water chiller. For example, the Active Aqua Chiller with Power Boost – 1/2 HP is a great choice for consistent cooling in small-to-medium tubs.

Step 4: Plumbing and Hoses

Use PVC or reinforced hoses to connect your chiller, pump, and tub. Make sure all seals are watertight. Use ball valves to control flow and maintenance access.

Step 5: Power & Testing

Plug in the pump and chiller, and run the system for several hours. Test for leaks, monitor temperature, and ensure clean circulation.

How to Maintain a DIY Cold Plunge Tub

• Change water weekly or bi-weekly for hygiene
• Add chlorine alternatives like bromine or UV sterilizers
• Use a cover when not in use to reduce debris
• Flush and clean filters monthly to maintain performance

Cold Plunge Tips & Safety

• Limit first sessions to 1–3 minutes, gradually increasing to 10–12 minutes
• Use a thermometer to monitor water temp and stay above 35°F
• Always have a towel and dry area nearby
• Consult your doctor before starting cold immersion therapy if you have cardiovascular conditions

FAQs About DIY Cold Plunge Tubs

Want more home wellness builds? Explore our other DIY gear guides in the GreenThumb Guides section.