Whether you have a small home space or need a flexible modular setup, here’s how Blue Cube’s tubs compare for recovery, wellness, and daily cold therapy.
Cold plunge therapy is no longer just for elite athletes—it’s now part of many people’s daily wellness routines. Whether you want faster recovery, better focus, or to build resilience, choosing the right tub is important.
Blue Cube is known for its American-made tubs that reliably reach 37°F. They use commercial-grade 1HP chillers with Japanese compressors, which cool water faster than most other brands.
These tubs are not like inflatable models that often leak after a season. Blue Cube uses a weatherproof Line-X coating, the same material used on truck beds, so you can place your tub on a deck, in a basement, or outdoors all year without concern.
Each model comes with 20-micron filtration and ozone sanitation, which keep the water clean for 4 to 6 weeks between changes.
These tubs plug into standard 120V outlets, cool water by 11 to 13°F per hour, and ship free to your curb anywhere in the continental US. Most models allow full-body immersion for people up to 6’3″ or taller, with options from simple single-speed circulation to adjustable River Mode jets that break up the warm layer around your skin for a deeper cold experience.
1. C1 Cold Plunge Tub
The C1 is the most popular starting point. This 60-inch tub offers full immersion for people up to 63″ tall. Its 1HP commercial chiller cools water to 37°F much faster than budget models. The 1.5″ spa-grade PVC piping ensures strong water flow, and the quiet 1/15 HP circulating pump won’t disturb your household.
The filtration system uses a 20-micron filter and ozone sanitation, so you don’t need to add chemicals often or clean algae every week. The water stays clear and free of bacteria with little effort.
The exterior has a Line-X coating, the same material used on truck beds to protect against rocks and weather. This means rain, snow, and sunlight won’t damage it.
You get three color options to match your space.
Blue Cube’s veteran craftsmen handcraft each unit in the USA, and the footprint is manageable at 92.5″ L x 37.5″ W x 29″ H. Empty weight sits at 650 lbs, so plan your placement before it arrives.
The tub uses about 13 amps while cooling, and much less once it is just maintaining the temperature.
You can adjust the temperature from 37°F to 70°F, so it’s possible to warm the tub for contrast therapy or a cool soak instead of a full ice bath.
This model does not include extras like adjustable jets or premium wood finishes. Instead, you get reliable performance and durability without added features.
If you want the most straightforward “buy once, use for years” Blue Cube setup, the C1 is the cleanest entry point—commercial-grade cooling, low-maintenance water care, and a shell built for real outdoor life. Check current pricing, shipping, and color options here:
➡️ C1 Cold Plunge Tub on Blue Cube
2. C2 Cold Plunge Tub
The C2 includes all the features of the C1 and adds River Mode, a 3-speed therapy pump for adjustable water flow. You can set it to low for gentle movement, medium for more noticeable flow, or high for strong circulation that breaks up the warm layer your body creates in still water.
This warm layer is real—your skin heats a thin layer of water around you, which makes the cold less eRiver Mode keeps cold water moving against your skin, so you get steady cold exposure instead of small areas warming up over time. Microzones.
The C2 has the same 60-inch size, 1HP chiller, and strong filtration and ozone system as the C1. What makes the C2 different are its finish options.
There are four color choices, and you can request custom colors if you want to match a certain look.
The top rim comes in premium walnut or mahogany wood finishes, which look great in a home spa or wellness studio. The Line-X base is still weatherproof for outdoor use.
The jets are quiet even at the highest setting, and the energy use remains low, so your electric bill won’t increase much. If you want a spa-like feel with strong cooling, the C2 is a good middle ground.
You can begin with the lowest setting if you’re new to cold therapy and increase the intensity as you get used to it.
The wood finish gives the tub a more luxurious look, making it feel like part of your home design rather than just gym equipment.
If you’re going to plunge consistently, River Mode is the upgrade you’ll feel every session—it keeps the cold “honest” by moving water across your skin instead of letting that warm layer build up. The C2 is the sweet spot: premium look + adjustable intensity without paying for extra length you may not need. See current C2 options and lead time here:
➡️ C2 Cold Plunge Tub on Blue Cube
3. C3 Cold Plunge Tub (66-inch)
If you are taller than 63″ or want more space, the 66-inch C3 gives you extra room. You can submerge up to your neck, dunk your head if you like, and stretch out your legs without feeling cramped. The extra six inches make a real difference in comfort, especially for daily use.
River Mode is standard here, same 3-speed adjustable flow to disrupt thermal layers and keep the cold consistent. The 1HP Japanese compressor chiller still hits 37°F fast, with the same 37°-70°F adjustable range.
Filtration and ozone sanitation match the rest of the lineup: 20-micron filter, low maintenance, water stays clean for weeks.
There are four standard color options, with custom colors available, and you can choose a walnut or mahogany wood top. The tub is about 73.38″ long, so it’s a bit bigger but still fits in most homes.
The Line-X coating lets you keep the tub outside all year in any climate without worrying about damage.
This model is great for tall individuals or for commercial spaces like gyms that serve people of different sizes. It can handle 11 to 15 plunges per hour, so the chiller keeps up even with frequent use.
If you’re over 6’3″ or just hate feeling cramped, the 66″ C3 is the upgrade that makes plunging easier to stick with long-term. More room means better positioning, better immersion, and a setup you’ll actually use daily. See the 66″ C3 specs and availability here:
➡️C3 66-inch Cold Plunge Tub on Blue Cube
4. C3 Cold Plunge Tub (72-inch)
The 72-inch C3 is Blue Cube’s largest standard tub, made for maximum immersion. If you are over 6’3″, want to float comfortably, or need a tub for a commercial space with many users, this size is ideal.
You can stretch out, change positions, and never feel cramped in this tub.
All the C3 features carry over: River Mode with 3-speed jets, 1HP chiller, Japanese compressor, 37°F capability, premium finishes in four colors plus custom options, and walnut or mahogany wood tops. Filtration and sanitation are identical, so maintenance stays minimal.
The tub measures about 79.38″ long by 31.50″ wide, so you’ll need to make sure you have enough space.
This model is ideal for commercial gyms, recovery centers, or hotels because it can handle heavy daily use. With a capacity of 11 to 15 plunges per hour, users don’t have to wait long for the water to cool down again.
The Line-X shell stands up to constant use and outdoor weather without cracking or fading.
For home use, this is the luxury option if you have enough space. It costs more for the extra size, but if cold therapy is important to you and you want maximum comfort, the 72-inch C3 is an excellent choice.
If you want the most comfortable full-immersion experience, or you’ll have multiple users, the 72″ C3 is the no-compromise option—space to stretch, reposition, and plunge without feeling boxed in. Check current 72″ C3 pricing and lead time here:
➡️ C3 72-inch Cold Plunge Tub on Blue Cube
5. CM Modular Cold Plunge (60-inch)
The CM series is designed for people who want a cold plunge tub but don’t want the chiller and pump box right next to it. This is helpful if you have limited space, want a cleaner look without visible equipment, or are planning a custom build where plumbing can go through walls or floors.
The CM Modular lets you put the chiller and pump unit up to 60 feet away from the tub.
The 60-inch CM gives you full immersion for people up to 63″, the same 1HP chiller that hits 37°F, a 3-speed River Mode pump for adjustable flow, and the whole temperature range from 37°-70°F. Filtration and ozone sanitation are built in, with a 20-micron filter keeping water clean.
You can choose from four Line-X color options or request custom colors, and the weatherproof shell works both indoors and outdoors.
The controller box is 49.25″ wide, 31.50″ deep, and 29.43″ high, so you can place it in a mechanical room, basement corner, or outdoor enclosure. Standard modular setups work well for plumbing runs under 20 feet.
Custom modular is available if you need to navigate bends, elevations, or longer distances.
This flexibility makes the CM a good choice for homes with unique layouts, commercial spaces that need to save floor space, or anyone who wants a cold plunge tub without visible equipment. You still get the same performance and durability as the standard models, but with more installation options.
If your #1 priority is a clean, minimalist setup—no chiller box next to the tub—CM Modular is the answer. You get the same Blue Cube performance, but with the freedom to place the mechanical unit up to 60 feet away. See CM Modular configurations here:
➡️ CM Modular Cold Plunge on Blue Cube
6. CM Modular Cold Plunge (66-inch)
The 66-inch CM Modular offers more interior space than the 60-inch model. If you are taller or want extra room, this size provides it while still letting you keep the chiller and pump up to 60 feet away.
Same remote installation advantages, same ability to customize plumbing runs for complex spaces.
This model includes a 1HP Japanese compressor chiller, River Mode 3-speed jets, a 37°-70°F temperature range, and full filtration with ozone sanitation. The Line-X coating comes in four colors or custom finishes, so it fits any style, and the weatherproof shell is suitable for outdoor use.
The controller box stays the same size as the 60-inch version, so it’s easy to tuck away.
Wellness centers, spas, and boutique gyms often choose this model when they need a larger tub but want a clean floor plan. The tub looks sleek and uncluttered, with the mechanical parts hidden out of sight.
For home installations, this is perfect if you’re building out a basement spa, garage gym, or outdoor wellness area where running plumbing through walls makes sense.
The longer tub is comfortable for taller users, and the modular design means you can place the equipment where it works best for your space. If your area has odd angles, limited space, or you want a minimalist look, the 66-inch CM is a good fit.
Want the extra room of a longer tub and the clean look of a hidden mechanical unit? The 66″ CM Modular is built for that—especially smart for garage gyms, basement spas, and boutique studios where layout matters. Check the 66″ CM Modular options here:
➡️ CM Modular Cold Plunge on Blue Cube
7. CM Modular Cold Plunge (72-inch)
The 72-inThe 72-inch CM Modular offers the most space for immersion and the most flexible installation. It is Blue Cube’s largest modular tub, made for commercial gyms, hotels, luxury homes, or anyone who wants both size and layout options. The spacious 72-inch tub interior, with the chiller and pump box located up to 60 feet away, keeps mechanical noise and bulk out of sight.
All the performance features are included: a 1HP chiller with Japanese compressor that cools quickly to 37°F, River Mode 3-speed jets, a 37°-70°F temperature range, 20-micron filtration, and ozone sanitation. The Line-X shell comes in four standard colors or custom options, and you can add a premium walnut or mahogany wood top for a spa look.
The controller box dimensions stay consistent, so it’s easy. This model is ideal for upscale commercial spaces where appearance is essential. The tub looks high-end and tidy in a gym or spa, while the mechanical parts stay hidden in a back room or utility area.
For homeowners with large properties or custom builds, you can put the tub on a patio, deck, or in a wellness room without worrying about noise or visible equipment.
If you want a long-term cold therapy setup with both a large size and flexible installation, the 72-inch CM Modular is a great choice. Custom sizes are also available if you need something even more specific.
If you’re building a premium, showpiece setup—large tub, clean floor plan, quiet mechanicals out of sight—the 72″ CM Modular is the top-tier choice. See current 72″ CM Modular pricing and configuration details here:
➡️ CM Modular Cold Plunge on Blue Cube
Pick the Right Blue Cube for Your Setup
After reviewing all the options, the C2 Cold Plunge is the best choice for most people. It offers strong cold therapy with a 1HP chiller that reaches 37°F, plus River Mode jets so you can adjust the intensity as you get used to cold plunges.
The premium wood finishes and custom color options help the tub blend into your home, so it doesn’t look like gym equipment in your backyard.
It fits people up to 63″ tall, which suits most users, and the 60-inch size works well in most homes without needing a large space.
The C2 is a middle ground between the basic C1 and the larger C3 models. You don’t pay for extra length you may not need, and you get more than just basic single-speed circulation.
You can adjust River Mode from low to high, so the tub adapts as your tolerance increases.
Start with a gentle setting if cold plunges feel intense, then increase it as you get used to the cold. This flexibility is helpful if you plan to use the tub regularly.
If you are taller than 63″ or want more space, choose the C3 in 66 or 72 inches. If you need flexible installation or want to hide the equipment, the CM Modular series offers it without sacrificing performance.
For most people who want premium features, proven durability, and a tub that looks good at home, the C2 is the best choice.
If you’re ready to start cold plunging, the C2 will support you for years, from your first short dip to longer sessions as you build confidence. Visit Blue Cube’s site to order. Free shipping in the continental US and a 5-year warranty on the frame, tub, electrical, and plumbing show the quality you’re getting.
Frequently Asked Questions
How cold do Blue Cube tubs actually get?
All Blue Cube models can reach 37°F, which is colder than most people need when starting. The 1HP chiller with a Japanese compressor cools water to 11-13°F per hour from ambient temperature, and you can adjust the target temperature from 37°F to 70°F, depending on whether you want full cold plunge intensity or a milder cool soak.
Do I need a special electrical setup?
No. Every Blue Cube model plugs into a standard 120V 15-20 amp outlet, the same kind used for most household appliances. You’ll pull around 13 amps while the chiller is actively cooling, then less once it’s maintaining temperature.
Make sure you’re using a dedicated circuit to avoid tripping breakers, but you don’t need an electrician to install special wiring for most home setups.
How often do I need to change the water?
With the 20-micron filtration and ozone sanitation system, you can typically go 4-6 weeks between water changes, depending on how often you use the tub. Ozone kills bacteria automatically, and the fine filter captures debris, so maintenance is minimal compared to tubs without these features.
You’ll drain it, wipe down the interior, refill, and you’re back in business.
Can I use a Blue Cube tub outdoors in winter?
Yes. The Line-X coating is fully weatherproof and handles freezing temperatures, snow, rain, and sun without cracking or fading.
The chiller is designed to operate in a wide range of ambient conditions.
Just make sure the tub is level and on a stable surface that can handle the weight when filled. Some users in extreme climates add insulation or covers for extra efficiency, but the tub itself won’t be damaged by outdoor winter use.
What’s River Mode, and do I actually need it?
River Mode is the 3-speed adjustable jet system available on the C2, C3, and CM Modular models. It creates a water flow that disrupts the warm thermal layer your body generates in still water.
That layer acts as insulation, reducing the effectiveness of the cold.
By constantly moving water across your skin, River Mode keeps cold exposure consistent and intense. You don’t strictly need it; the C1 works fine without it, but it makes a noticeable difference in how deep the cold feels and how quickly you adapt to longer sessions.
How long does it take to cool a full tub from tap water temperature?
If your tap water comes out at 70°F and you want to hit 37°F, you’re looking at roughly 3-4 hours depending on ambient conditions. The chiller cools at 11-13°F per hour, so that you can do the math based on your starting temperature.
Most people fill the tub the night before or early in the day, set their target temp, and it’s ready when they want to use it.
Once it’s cold, the chiller maintains that temperature with minimal energy draw.
Will a Blue Cube tub fit through standard doorways if I want it indoors?
The tub dimensions vary by model, but the width is typically 31.5-37.5 inches, which fits through most standard 36-inch doorways if you angle it carefully. The larger challenge is weight and maneuvering tight corners.
At 650+ lbs empty, you’ll want help moving it, and the footprint when assembled might not fit through narrow hallways or basement staircases.
Check the full dimensions for your chosen model and measure your space before delivery. Blue Cube offers a white-glove delivery service for complex installations, which can save you headaches and potential damage.