Black / California Redwood
California Redwood
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The Cold Stoic Classic




Our original tank, the Cold Stoic® Classic is constructed with weather-treated wood panels. It features always cold and clean technology which keeps your plunge water fresh and will encourage you to add cold water immersion to your daily routine. A programmable thermostat allows you to control the temperature. Cold Stoic® Classic can live outdoors or indoors, and its modern aesthetics will elevate any environment.

Renu High-Flow Chiller

Our Renu 1/4 HP water chiller can be set to chill the water temperature down to as low as 36F (2.2C) & our magnetic drive water pump works with quiet, efficient, and reliable 24/7 performance. Featuring a magnet impeller assembly and an epoxy-encased power unit, our pump cycles an amazing 20 Gallons every minute and never gets contaminated with harmful oils or chemicals. Also, integrated into our system is a 2-stage filtration system with a removable large grate that catches larger debris and a flow-through, replaceable 50-micron water filter element for fine particles. Finally, our ultraviolet ozone generator discharges ozone into the water to help eliminate bacteria, viruses, and metals.

Intelligently Engineered, Designed, & Assembled in USA.

Our cold tanks are designed to last years. For example, our tanks feature a fully enclosed housing for the chiller system to ensure the longevity of all the electronics and pumps. Our tubs are Super Insulated for maximum efficiency and have a Leak Proof tank design. All of our products are constructed with the highest-quality components and have been extensively tested. Performance and reliability were considered in every step of our design process. Finally, we proudly design and assemble all of our cold tanks in Southern California.

Beautifully Designed for Indoors or Out

Customize your tank for your gym, garage, or outdoors space. Our designs are minimalist, modern, and can match any environment. We believe quality design deserves the best materials. We use beautiful Natural Woods like Cedar and Redwood, which are treated with all natural oils and no chemicals. Every unique unit has its own artful characteristics.

Quiet and Energy Efficient

Our fully sealed design combined with our custom high-flow chiller allows your cold tank to operate at a whisper.  You’ll barely notice it’s there! Our thermally insulated tub keeps water colder and separated from the elements.  This allows the chiller to work more efficiently and saves 30% more energy compared to other cold tanks.  Our tanks are so well insulated, that in our tests, water stays below 60 degrees F even 24 hours after we've fully unplugged our unit.


  • Exterior Dimensions: L 64” x W 34.5” x H 34.25"
  • Tank Dimensions: L 36" x W 24" x H 30"
  • Dry Weight: 375 pounds (170 Kg)
  • Filled Weight (with 80 US Gallons): Approximately 1,050 lbs
  • Uses Standard 110 Volt
  • 1/4 Horsepower Chiller
  • Typical Power Consumption (while Chiller active): 350-500 Watts @ 3-5 Amps
Noise Rating (while Chiller is active)
  • 67 Decibels at 2 inch distance from large grill (with ventilation grills in place)
  • 58 Decibels at approximately 3 feet from large grill (with ventilation grills in place)

Video Reviews

Bubba Wallace

Bubba Wallace

Professional NASCAR Driver Bubba Wallace uses cold plunging to build patience and resilience

Mario Lopez

Mario Lopez

Actor/TV Host Mario Lopez is just starting to use cold water therapy to help his recovery and energy.

James Maslow

James Maslow is an American actor, singer and dancer. He is best known for his role on Nickelodeon's Big Time Rush and is a member of the subsequent band, Big...

Alexander Ludwig

Actor Alexander Ludwig from Vikings has dreamed of owning a cold plunge since he was a kid.  Cold Exposure has even "saved his marriage".

Pamela Love

Jewelry Entrepreneur Pamela Love discovered cold exposure while recovering from pregnancy.  Now, she also uses Cold Stoic 2.0 to reached a "meditative state."

Stephen Amell

Stephen Amell is a Canadian actor and professional wrestler, who is most famous for his roles in Arrow and the new Heels series on Starz. He loves cold plunging in...

Wilmer Valderrama

Wilmer Valderrama is an actor and producer most known for his roles in NCIS and That 70's Show.  Recently, he has pursued a health transformation journey which incorporates Cold Water...

Derek Hough

Derek Hough, of Dancing with the Stars fame, stays in peak shape at age 37 by using his Renu Therapy Cold Stoic in his contrast therapy routine.

Garrett McNamara

Big Wave Surfer Garrett McNamara is probably in the best shape of his life because he is training with a heated sauna and cold plunge therapy.

Brett Eldredge

Singer/Songwriter Brett Eldredge cold plunges to stay at the top of the charts mentally and physically.


Instructional Videos

How to Use Your Maintenance Items?

Learn how to use your Renu Therapy maintenance items.

How to Maintain Your Chiller

Learn how to maintain the chiller on your Cold Stoic Classic.

How to Maintain Your Deck

Proper maintenance of the deck will help ensure the durability of your Cold Stoic Classic through all seasons.

How to Drain Your Tank

Learn how to drain your Cold Stoic Classic

How to Change the Filter

Learn how to change the filter on your Cold Stoic Classic.

When to Change Filter

Learn when to change your filter for your Cold Stoic Classic

Setting Up Your Tank

How to setup your Cold Stoic Classic in easy steps.

Instructional Videos Caret

Customer Reviews

Based on 58 reviews
Philip Healy (Naples, US)

Then is the best unit ever. Great delivery and installation is easy. Self contained and looks great. Water stays at 38 degrees. Body has never felt better

Andrew Keene (Galveston, US)
Cold Therapy is Life Changing

The device itself is great. Looks great on our patio. Installation is super easy (although you’ll need a couple buddies to move it off the pallet and to where you install). I bought this cold plunge to help with breathing exercises, accelerate metabolism and cut back inflammation and soreness from jiu jitsu, running, and lifting. I’ve also found it provides for improved mental clarity.

Mike Tsai (Pasadena, US)
One of the best investments one can do for their health!

I am so happy with this purchase and with this company. After many months of research and waiting for my cold stoic to be built and delivered, it was all worth it. I also got the temperature down to 32 degrees which was much lower than the standard lowest setting for the chiller. I have been doing 35 degrees for 6 minutes, 5 days a week and I feel amazing! Thank you, Steve and everyone at Renu Therapy!

rossi (Greenville, US)
loving our cold stoic plunge

we love our tub. we live in florida and took a trip to renu once while out in california and bought it on the spot. my husband is an athlete and loves to do sauna and cold and we had been eyeing this tub for a long time. steve made sure it got to us in a timely fashion. we had an issue setting it up because a piece had cracked in shipment (shipper’s fault, not renu) but steve and his team found someone in florida to come over and set it up for us once the new part arrived. definitely recommend this company and appreciate their customer service.

Martha Leath (Atlanta, US)
What I immediately knew and what I've learned

I've had my Cold Stoic Classic a little over 2 months now. As far as logistics, the delivery was well communicated and went smoothly. To move the unit from the pallet to the house, I hired a moving company and the guys literally walked the unit from the garage to the basement. So far, so good. In setup, I ran into a problem with one of the valves, but the technical staff helped me easily straighten that out and, in no time, I was set to go.
I immediately knew I loved it from the appearance side (I got the blue color with the redwood deck) but was still very concerned about actually using it. You see, I HATE getting in cold water and if I couldn't be consistent with cold showers, what made me think I'd do better with this unit? Well, from the first plunge, I immediately knew this was different. The breath deck is amazing! I have done plunges at a spa facility where you just get in a tub, but being able to breathe and center myself on the deck was a game-changer (as other reviewers have said). Also, I didn't have to force myself to stay in a certain amount of time to get the "full experience" of a plunge like at the spa - I had the freedom to tailor the experience to how I was feeling for that particular plunge and the ability to use it whenever I wanted.
What I've learned is I still dislike (but not hate) getting in cold water, but I know I can do it and after the initial shock, I actually relax. I don't think I'll ever say to myself, "I can't wait to get in the plunge tank", but I do say, "I know I'll feel great after I use the plunge tank". I actually miss it when I don't plunge, very unlike a cold shower. I have more energy and I'm sleeping better which I attribute to the cold exposure. Even my husband, who swore his back would "just seize up" if he got in cold water, is enjoying the benefits of plunging.
I've also learned maintenance is easy. I've changed the filter twice with no problems. I use that schedule to reduce the temperature by one degree to gradually adjust to colder water. Started at 51 degrees and am now at 49. I like being able to chose the temperature.
I am so very pleased with my purchase and highly recommend it. It took me a year to decide to finally do this, and I wish I hadn't hesitated. By the way, I'm 69 years old (I mean young) if someone in my peer group needs encouragement to "take the plunge".

Michael Levine (East Setauket, US)
Wonderful so far!

Love it!

John Daniels (Ferndale, US)
Cold Plunging in The Best

Renu Therapy and their Cold Stoic Classic is much better then I anticipated. The entire unit is top notch! Their videos to set the tub up and how to maintain it is very easy and simple to understand and do. I couldn't be happier with our Stoic Classic!!

maureen Gevertz (South San Francisco, US)
great addition to our wellness routine

We were so excited to receive our Renu cold plunge and quickly became addicted! First set the temp to 58 to ease into it and now set at 53F and can easily spend 2 minutes+ every morning soaking and breathing. A great jumpstart to the day, have more energy and focus through-out the work day, take our plunges after morning workouts and also evening feet soaks to wind down. Best investment out there. We considered other units, but they looked like bathtubs. The Renu blends into to our backyard aesthetic, is easy to use and a great investment! Maureen & Barry Gevertz

Utah user (Salt Lake City, US)
As advertised

The plunge looks and smells good. Works as advertised. We’ve had a brief setup scare due to a leak in the inflow valve but apart from this no problems so far (Week 3). The plunge has become a daily routine.

Mary Solomon (Phoenix, US)

I love the Stoic! It can’t be any cleaner, easier or more convenient to Cold-plunge every day.