About the HomePlunge H3

The HomePlunge H3 is a cold plunge water chiller that turns your existing bathtub into a fully functional cold plunge — no dedicated tub, no bags of ice, and no plumbing required. It's the premium model in the HomePlunge lineup, purpose-built for anyone who wants the benefits of cold water immersion without redesigning their bathroom or committing to a bulky standalone setup.

How It Cools

The H3 is powered by a 1HP compressor that circulates and chills your bathwater at a rate of 20–30°F per hour. For most standard bathtubs, that means your water reaches cold plunge temperatures before you've finished your morning coffee. Precise digital temperature control lets you dial in anywhere down to 34°F — whether you prefer an introductory 60°F session or a full deep-cold protocol, the H3 locks in your target and holds it there. No guessing, no thermometer checks, no temperature drift halfway through your soak.

Why a Chiller Instead of Ice

If you've ever tried a DIY ice bath, you already know the pain points. Buying ice in bulk gets expensive fast. Hauling bags from the store to the tub is a chore that gets old after the first week. And even when you do fill the bath with ice, the temperature is inconsistent — it spikes the moment you get in and warms unevenly as the ice melts at different rates.

The H3 solves all of that. It delivers consistent, repeatable cold water at the exact temperature you choose, every single time. The built-in smart app lets you schedule sessions in advance, so the H3 can have your bath chilled and waiting before your alarm goes off or right when you get home from the gym. No prep, no cleanup, no daily ice runs. Just step in.

Over time, a chiller also costs less than ice. A single bag of ice lasts one session. The H3 runs on standard household electricity and uses less energy than most people expect — often under an hour of active cooling per day once the water is at temperature.

Setup and Portability

One of the biggest advantages of the H3 is that it requires zero plumbing modifications. Two insulated hoses connect the chiller to your bathtub using a simple faucet adapter, and the unit plugs into a standard wall outlet. That's it. Setup takes minutes from the moment you open the box, and there's nothing permanent about the installation.

When you're not using the H3, disconnect the hose-arm with a button and roll it into a closet, a corner of the garage, or under a counter. It's compact and portable enough for apartments, rental homes, or anyone who doesn't want a piece of recovery equipment sitting out full-time. You get the performance of a professional-grade cold plunge chiller with the flexibility to put it away whenever you want.

Built-In Filtration

The H3 includes a built-in reusable water filter that keeps your bathwater clean between sessions. It captures particulates and helps maintain water clarity, so you don't need to drain and refill after every use. When it's time, just rinse the filter — no replacement cartridges to buy and no ongoing filter costs. And when the water has run its course, simply drain the tub and start fresh.

The Benefits of Cold Plunging at Home

Cold water immersion is used by professional athletes, physical therapists, and wellness practitioners around the world — and the research behind it continues to grow. Regular cold plunge sessions are associated with faster muscle recovery after intense exercise, reduced inflammation and joint soreness, a measurable increase in dopamine and norepinephrine that supports mood, energy, and mental clarity, and improved sleep quality when practiced consistently.

New to cold water? Read the complete guide to a cold plunge at home.

The challenge has always been access. Gym plunge pools have limited hours. Cryotherapy sessions are expensive. Ice baths are a hassle. The H3 removes every barrier by bringing cold therapy into the space you already have — your bathroom.

Who the H3 Is For

The HomePlunge H3 is built for anyone with a bathtub and a reason to feel better. That includes competitive and recreational athletes who want a reliable post-workout recovery tool, wellness enthusiasts building a cold exposure or breathwork practice, people managing chronic soreness or inflammation, and anyone who wants to start their day with sharper focus and more energy. If you have a bathtub at home, you have everything you need to get started.