The HomePlunge H3 is an award-winning cold plunge chiller that transforms the bathtub you already own into a professional-grade cold plunge - no dedicated tub, no bags of ice, and no plumbing required. Powered by a 1HP compressor, it cools any standard bathtub from warm water down to 34°F in just 45-60 minutes, delivering consistent, repeatable cold water therapy at the exact temperature you dial in. The H3 sits beside your tub on rolling casters, with a patented bendable hose-arm that clips over the rim - nothing is plumbed in, nothing is permanent, and it rolls away when you're done.
Winner of a CES Innovation Award and named to TIME Best Inventions, the H3 earned the highest Garage Gym Reviews score of any indoor cold plunge on their 2026 list. It's built for athletes, wellness enthusiasts, and anyone who wants the benefits of daily cold water immersion without redesigning their bathroom or hauling bags of ice.
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The HomePlunge H3 brings professional-grade cold water immersion therapy into your home without the cost, space, or commitment of a dedicated plunge tub - at a fraction of the price of competing systems. It's trusted by UFC fighters, former pro athletes, and everyday wellness enthusiasts who want a reliable, repeatable cold plunge practice built into their routine. The smart app scheduling means your bath can be chilled and waiting the moment you wake up or walk in from the gym - no prep, no ice runs, no guesswork. The reusable built-in filter keeps operating costs genuinely low, and the compact rolling design means it works just as well in an apartment as in a gym facility. If you're serious about recovery, focus, and feeling your best every day, the H3 is the most practical and capable way to bring cold therapy home.
Will the H3 fit my bathtub?
If your tub holds water and is between 30-110 gallons, the H3 will work. It's been tested on standard alcove tubs, freestanding soakers, clawfoot tubs, and acrylic spa tubs. The chiller doesn't go inside the tub - it sits beside it, and the patented bendable hose-arm clips over the rim to circulate water. Nothing is plumbed in or permanently attached.
How much does it cost to run the H3 each month?
Less than $10/month for most users. The H3 draws 4-6 amps while actively chilling, which is typically under an hour per plunge session. When idle, it draws near zero power. Running it daily costs less than a coffee subscription, and there are no ongoing filter cartridge costs since the built-in filter is reusable.
Do I have to drain the tub after every cold plunge?
No. Most H3 owners keep the same water for about a week and drain on the weekend. The built-in reusable filtration system keeps the water circulating and clean between sessions, so there's no need to drain and refill after every use. You can drain after every plunge if you prefer, but it's a choice - not a requirement.
Does the H3 require any plumbing or electrical work?
None at all. The H3 plugs into any standard 110V/60Hz household outlet - the kind found in any bathroom. No electrician, no plumber, and no permits are needed. Setup takes just a few minutes: fill your tub, click the hose-arm into place over the rim, set your target temperature, and walk away. A 220V/50Hz version is available upon request.
How does the H3 compare to buying bags of ice?
The H3 is more consistent, more convenient, and cheaper over time. Ice baths are inconsistent - the temperature spikes when you get in and warms unevenly as ice melts. Buying ice in bulk gets expensive quickly, and hauling bags is a daily chore. The H3 delivers the exact temperature you set every single time, lets you schedule sessions from your phone, and costs less than $10/month to run - no prep, no cleanup, no ice runs.
Can I control the H3 from my phone?
Yes. The H3 uses the Tuya smart app, available on both iOS and Android. You can set your target temperature and schedule plunge sessions remotely, so your tub can be chilled and ready before you wake up or right when you get home from the gym. You can also adjust settings directly on the unit's touchscreen.
What warranty comes with the H3?
Every H3 comes with a 1-year manufacturer warranty included at no extra cost. At checkout, you can extend coverage up to 4 total years with SureBright, which covers both accidental damage and mechanical failure. Options range from +1 year to +3 additional years.
