C1 Cold Plunge Tub
The C1 is a compact, residential-focused cold plunge for indoor and outdoor use with a temperature range from 37º to 104ºF. It’s also equipped with our standard RiverMode™, for continuous flow and a true immersion cold experience.
Dimensions
Standard:
- Frame: 92.5” × 37.5” × 28.5” (L × W × H)
- Tub Interior: 60” × 24” × 21.25” (L × W × H)
XL:
- Frame: 98.5” × 37.5” × 28.5” (L × W × H)
- Tub Interior: 66” × 24” × 21.25” (L × W × H)
Experience
The C1 cold plunge tub has a solid, grounding feel with continuous cold flow for a full-body immersion you can rely on.
- Full-body immersion up to neck (head-submersion capable)
- High flow rate for true immersion and thermal barrier disruption
- App controlled (iOS & Android)
- Quiet operation
- Lights for nighttime and aesthetic use
Requirements
- Suitable for indoor and outdoor installation
- Suitable for most surfaces as long as its level
- Power: 20A dedicated standard outlet (see performance tab)
Included
- Insulated spa cover with child locks included
- Maintenance kit
Handcrafted with uncompromising attention to detail, each tub delivers a truly luxurious look and feel that goes far beyond the standard.
Tub Construction
- Stainless Steel Tub: Premium marine-grade 316-L stainless steel, 14-gauge–chosen for strength, longevity, and a refined finish
- Upgrade Options (Note: the following are DOH compliant where non-metal is required):
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- Carbon Fiber
- Hemp Carbon
- Gel-Coated Fiberglass
- Contoured interior at a 20º slope–bringing bath tub ergonomics to your plunge experience
- Extra-thick walls for unmatched strength and stability
Exterior & Colors
- Line-X® weatherproof coating with UV and insulative properties
- 4 standard color options: white, black, grey, and beige; or any Sherwin-Williams custom color
- Custom cladding options available when ordering a custom product. See customs page.
Wooden Deck Options
Our signature wooden decks are hand-selected and finished by our craftsmen in Oregon, delivering a clean, elevated finish.
Popular Wood Choices:
- Walnut
- Mahogany
- White Oak
- White Maple
- Cherry
(Note: Wood decks are not typical for our Limitless tub due to its height.)
Customizations & Upgrades
- Any Sherwin-Williams paint color
- Custom Logos: CNC wood, or laser engraved/cut stainless steel
- Choice of tub: stainless steel, hemp carbon, carbon fiber, gel-coated fiberglass
- Powder coated screens or tubs
- Stone, tile, other cladding? Order “prepped for on-site cladding”
- Foot Pegs
- Reverse plumbing / vents
- Additional upgrades: see customs page
Introducing RiverMode™, Our Signature Feature:
In still water, your body quickly creates an insulative layer of warm water around the skin—known as your thermal barrier—which reduces the intensity of the cold. RiverMode™ is engineered to eliminate that barrier by creating continuous water movement resulting in true immersion. The result is deeper full-body exposure, and a noticeably more effective cold experience.
Flow & Circulation
Standard RiverMode™: This model features a ¼ HP pump with a flow rate of 25.6 gallons per minute. Dual-Pump RiverMode+™ not available for this model.
Iwaki America Pumps: BlueCube uses Iwaki America pumps featuring magnetically coupled centrifugal pump technology that is nearly silent and industry leading in power and energy efficiency. Chosen for their safety, efficiency, and reputation for extreme durability.
Chiller & Heating System
The C1 comes with a powerful 1.5 HP+ commercial chilling motor with precision Japanese compressors, delivering industry-leading cooling performance. Capable of bringing the water down to 37° faster than any cold plunge tub in its class.
- Temperature Range: 37°F – 104°F
- 13,600 BTU (1.5 HP+)
- Outdoor winter-rated, operates down to -5°F
- Typical cooling at 10-12ºF / hour
Electrical & Plumbing
Electrical
- Voltage: 120V
- Amperage: 20A
- Requirement: Standard dedicated outlet
- Comes with GFCI power cord
- Can be hardwired (pigtailed)
- Any length chord
Plumbing
- Pool and spa-grade 1”–1.5” Schedule 40 PVC — built for high pressure, high flow, temperature fluctuations, and long-term reliability.
- Pipes are heavily insulated by hand
Filtration & Sanitization
- 20-Micron Filtration System: All of our cold plunge models feature a 20-micron filtration system. This ensures a hygienic cold therapy experience with minimal maintenance.
- Ozone Automatic Sanitization: Uses ozone gas (O₃), a powerful oxidizer, to break down bacteria, viruses, and organic contaminants in the water without relying on added chemicals. Ozone is particularly effective for cold plunges because it acts over 3,000 times faster than chlorine and works better in cold water.
**AOP & chlorine drip available in other models.
For high-traffic and regulated environments, our Commercial Upgrade Package is built to elevate performance, streamline approvals, and support continuous use at scale. It’s a powerful add-on designed to give your system the flexibility, durability, and confidence needed for demanding commercial spaces.
This tub does NOT include a Commercial Upgrade Package.
Please see the C2 model which is a similar shape and can be fully upgraded.
We offer free shipping to 48 states and many convenient payment options. Click tabs below to view details.
Payment Options
- Pay with any major credit card
- Check
- Wire transfer
- ACH transfer
Financing
- 0% APR financing for 6 months via Shop Pay Affirm
- HSA/FSA funds approved
- Home financing through HFS (best terms available)
- Commercial equipment financing available
Shipping
- Free curbside shipping to the continental 48 states
- Talk to a specialist to explore delivery options
All our wood construction cold plunges come with a 3 year bumper to bumper residential warranty, and a 1 year bumper to bumper commercial warranty. This warranty covers components, plumbing, electrical, and labor.
Warranty Details:
- 30-day Refund Guarantee (includes a restocking fee)
- Residential: 3 Years Full Coverage (Labor & Parts)
- Commercial: 1 Year
- Tub & Frame: 10 Years Residential
- Service Plan: 5 Years with Service Plan
- Live U.S. Video Support: Available Monday – Friday 9 am to 5 pm PST.
Exclusions:
- Warranty does not cover shipping costs.
- Customs are non-refundable. Wood decks are considered custom builds.
Maintaining Your BlueCube is simple. Click the tabs below to view details.
Routine Maintenance
- Simple filter replacement (3-6 months or 10-12 water changes depending on use)
- Drain and replace water (recommended 2-4 weeks residential; as needed commercial)
Setup
- Fully assembled.
- Simple start-up: Check unions, fill tub, prime filter. Instructions included.
Service & Support
- Live U.S. Video Support: Available Monday – Friday 9 am to 5 pm PST.
- BlueCubes have large compartment areas that can be serviced by plumbers and pool and spa techs.
- On-site technical support is available for both residential and commercial clients.
- Replacement parts are easy to order & install
