Lie back, like a bath
There's no bench inside. You sit on the floor of the tub and lean back, as in a traditional bathtub, so you can immerse fully to the shoulders. Dynamic Cold Therapy notes the Cuboid may suit taller bathers.
Cold Therapy · Dynamic Cold Therapy
Dynamic Cold Therapy Cuboid XL Cold Plunge, 304 Stainless Steel
Regular price $6,999.00 Complimentary shipping · contiguous U.S.
The longest Cuboid: 55 in of 304 nano-coated stainless steel inside a stainless steel cabinet with Pacific cedar trim, with room for taller bathers to lie back. Add a Wi-Fi chiller to hold your water as low as 37°F.
- 37°Fcoldest setting
- 55 inlong
- 1 personcapacity
- 120 Vstandard outlet
- ◷Complimentary shipping Within the contiguous U.S. We confirm your delivery window when you order. Details
- ◇Plugs into a standard outlet Both chillers run on 120 V, with GFCI built in. Specs
- ✓1-year limited warranty On the tub and chiller, from Dynamic Cold Therapy. Coverage
- ↺30-day returns On unused items in original packaging. Return policy
- ✦Questions? Chat with us now Instant answers on sizing, placement and delivery. Start a chat
Planning your setup?Our wellness team can help with placement, power, chiller sizing and delivery, with answers in seconds.
Overview
The longest Cuboid, lined in stainless steel
Five more inches to stretch out
At 55 in long, the XL gives taller bathers more room to lie back. The 304 nano-coated stainless steel interior sits inside a nano-coated stainless steel cabinet with Pacific cedar trim.
Locked and covered
A custom cover with child-safety locking latches keeps the water clean and helps hold its temperature between sessions. A cedar step makes getting in and out easy.
Options
Choose how you chill
Choose a version in the buy box above. Both chillers come from Dynamic Cold Therapy, are made for its tubs, cool and heat, and plug into a standard 120 V outlet.
Tub only, $6,999
The tub, cedar step and locking cover, with no chiller. You fill it with cold water and ice, and change the water every 3 to 5 days. A chiller is the way to hold a steady temperature.
With the 0.8 HP chiller, $10,899
Holds your water anywhere from 37°F, with heat, Wi-Fi app control and scheduling, plus built-in filtration and ozone. Dynamic Cold Therapy recommends at least 0.8 HP for the Cuboid.
With the 1.0 HP chiller, $11,399
The same features with more cooling power. Choose it for frequent plunging, faster cooldowns, or a warm room or climate. For the XL, the 1.0 HP gives you more cooling headroom.
Optional accessories, chosen in the buy box: a 4-pack of replacement 20-micron filters for the chiller, and a pair of 9 ft neoprene hose covers that insulate the water lines and help manage condensation.
Specifications
Full technical specifications
Tub
- Model
- Dynamic Cold Therapy Cuboid, DCT-S-055-NS-34
- Exterior
- Nano-coated stainless steel cabinet with Pacific cedar trim
- Interior
- 304 nano-coated stainless steel interior
- Size
- 55 in long × 30 in wide × 31.5 in tall
- Seating
- No bench. You sit on the tub floor and lean back.
- Capacity
- One person
- Cover
- Custom cover with child-safety locking latches and keys
- Step
- Pacific cedar step, 11.81 in high
- Connections
- Chiller inlet and outlet, plus drain
- Weight
- 207 lb, empty
Chillers (optional)
- Options
- 0.8 HP or 1.0 HP Dynamic Cold Therapy chiller
- Temperature
- Down to 37°F, with heat function
- Controls
- Wi-Fi app control and scheduling
- Water care
- Built-in filtration and ozone
- Placement
- Indoor or covered outdoor use
Electrical
- Tub
- No power needed
- Chiller
- Standard 120 V outlet, with GFCI built in
Warranty
- Tub
- 1-year limited warranty from Dynamic Cold Therapy on the insert, the wooden trim and all other components
- Chiller
- 1-year warranty
- Hose covers
- 90-day warranty
Compare
Find the right Cuboid
All three share the same nano-coated stainless steel cabinet with cedar trim, 30 in width, 31.5 in height, cedar step, locking cover and 0.8 HP or 1.0 HP chiller options. Prefer to sit upright on a bench? See our barrel cold plunges.
| Cuboid Plastic | Cuboid Stainless | Cuboid Stainless XL This plunge | |
|---|---|---|---|
| Interior | PVC | 304 stainless steel | 304 stainless steel |
| Length | 50 in | 50 in | 55 in |
| Empty weight | 178 lb | 200 lb | 207 lb |
| Tub only | $5,999 | $6,499 | $6,999 |
| With 0.8 HP chiller | $9,899 | $10,399 | $10,899 |
| With 1.0 HP chiller | $10,399 | $10,899 | $11,399 |
| View Cuboid Plastic | View Cuboid Stainless |
Dimensions & space
Plan your space
Plan for the tub and its step, room for the chiller within reach of its 8 ft hoses, and a floor that can carry the filled weight.
| Item | Measurement |
|---|---|
| Length | 55 in |
| Width | 30 in. Allow up to 32.5 in when you plan your space. |
| Height | 31.5 in |
| Cedar step | 11.81 in high, 23.62 in wide, 11.22 in deep |
| Empty weight | 207 lb |
| Filled weight | Plan for well over 1,200 lb at full capacity, before bathers |
| Chiller footprint | About 15 × 21 in, beside the tub |
- Set it on a flat, stable, waterproof floor, ideally near a floor drain
- On a deck or upper floor, have a builder or engineer confirm the load
- Keep it near a water source and somewhere to drain
- Leave room for the chiller beside the tub, near a 120 V outlet
Installation
Place it, connect it, fill it
The Cuboid is freestanding. There's no permanent plumbing, and the chiller plugs into a standard outlet.
Place
- Choose a smooth, level spot with no sharp objects underneath
- Indoors, avoid carpet and keep moisture-sensitive items away. Make sure the room is well ventilated.
- Outdoors, choose shade or cover. Long sun exposure shortens the life of the tub.
Connect
- Connect the chiller's quick-connect hoses to the tub's inlet and outlet
- Check that every hose gasket is seated before you fill
- Plug the chiller into a standard 120 V outlet. Keep other electrical items at least 5 ft from the tub.
Fill & start
- Inspect the tub for damage before filling
- Fill with a hose to about 70%, enough to cover your upper body with your head above water
- Set your temperature on the chiller or in the app
Video guides
Watch how it's done
Support videos from Dynamic Cold Therapy. The tub and chiller in these videos may look different from yours, but the steps are the same. Your manual has the exact steps for your model.
What's included
In the box
With every Cuboid
- Cuboid tub with 304 nano-coated stainless steel interior
- Pacific cedar step
- Custom cover with locking latches and keys
- Accessory kit: rubber plugs, disk strainers, inlet and outlet caps, drain adapter kit and quick-connect hose kit
- User's manual
With a chiller
- 0.8 HP or 1.0 HP cold and heat chiller
- Two 8 ft quick-connect hoses
- Filter cartridges
- Chiller user's manual
Optional: replacement filter 4-pack and neoprene hose covers.
Downloads
Manuals & guides
Open, save or share the manufacturer's documents, so you and your installer can plan ahead.
- Cuboid Cold Plunge Tub User's Manual (PDF)
Dimensions and weights for all three Cuboid models, site requirements, filling, water care, storage and warranty, from Dynamic Cold Therapy
Using & care
Simple to run, easy to maintain
Every session
- Enter feet first, using the cedar step
- Breathe slowly and steadily. Don't hyperventilate or hold your breath.
- Start at milder temperatures and build up gradually
Water care
- Keep the pH between 7.2 and 7.8, and test it regularly
- With a chiller, the filter and ozone help keep water clear. Without one, change the water every 3 to 5 days.
- Keep the cover locked when the tub isn't in use
Tub care
- Wipe the interior with a soft cloth and a mild detergent. Avoid hard bristle brushes.
- Before storing, drain fully, dry and cover the tub
- Don't store or use the tub below freezing
Near the coast, or planning to use chlorine or bromine? Salt air and some chemicals can corrode stainless steel, and Dynamic Cold Therapy doesn't recommend its stainless Cuboid in coastal regions. Its PVC-lined barrel is the coastal choice. Chat with us now and we'll help you choose.
Cold water is a strong stressor for the heart and lungs. If you have heart disease, an arrhythmia, high or low blood pressure, circulation problems, diabetes or another medical condition, take medication, or are pregnant, check with your clinician first. Never plunge alone or after alcohol, and get out right away if you feel weak, dizzy or unable to control your hands and limbs. Your core temperature can keep dropping after you get out, so warm up gradually. Children should only use it with close adult supervision.
Research
What the research explores
Stress, sleep and wellbeing
A 2025 review of 11 studies with more than 3,000 participants found cold-water immersion may lower stress, improve sleep quality and support quality of life, with some effects changing over time. Read the review
A natural alertness response
Immersion in cold water triggers a measurable rise in noradrenaline, a hormone involved in alertness and focus. Read the study
Recovery and soreness
Reviews of cold-water immersion after hard exercise report lower perceived muscle soreness and better perceived recovery. Read the review
Recovery isn't the same as adaptation. Cold exposure right after strength training may blunt some of the muscle-building response, so if muscle growth is your goal, schedule cold sessions apart from lifting. Read the study
Delivery, returns & warranty
Clear terms, before you buy
Delivery
Shipping is complimentary within the contiguous U.S. We confirm your delivery window and any delivery details when you order. Chat with us for an estimate to your address.
Returns
Request a return within 30 days of delivery for unused, uninstalled items in their original packaging. Please report damage within 48 hours of delivery. Approved non-defective returns have a 25% restocking fee, and return freight is the customer's responsibility. Full return policy
Warranty
Dynamic Cold Therapy covers the tub for 1 year against defects in materials and workmanship, and the chiller for 1 year with lifetime product support. Coverage excludes finish wear, UV fading, freeze damage and corrosion from missed water care. Chat with us now with any coverage questions.
FAQ
Questions, answered
Do I need a chiller?
Not to start. Without one, you fill the tub with cold water and ice and change the water every 3 to 5 days. A chiller holds your chosen temperature, down to 37°F, and filters and sanitizes the water as it runs.
Which chiller should I choose?
Dynamic Cold Therapy recommends at least 0.8 HP for the Cuboid. Choose the 1.0 HP for frequent plunging, faster cooldowns, a warm room or climate, or for the extra volume of the XL. Both cool and heat, and both run on a standard 120 V outlet.
Is there a seat inside?
No. The Cuboid has no bench. You sit on the tub floor and lean back, as in a bathtub. If you'd rather sit upright, our barrel cold plunges have a built-in bench.
Do I need an electrician or a plumber?
Usually not. The tub needs no power, and the chiller plugs into a standard 120 V outlet with GFCI built in. You fill it with a hose and drain it through the drain port, so plan where the water will go.
Can it go outdoors?
Yes, on a level surface. Choose shade or cover, since long sun exposure shortens the life of the tub. The chiller is rated for indoor or covered outdoor use, and the tub shouldn't be stored or used below freezing.
How heavy is it when filled?
The Cuboid Stainless XL weighs 207 lb empty. Dynamic Cold Therapy lists 120 to 150 gallons across the Cuboid range, and water alone weighs about 8.3 lb per gallon, so plan for well over 1,200 lb filled, before anyone gets in. The manual suggests filling to about 70%. On a deck or upper floor, have a builder or engineer confirm the load.
I live near the coast. Is stainless steel right for me?
Salt air and chemicals like chlorine and bromine can corrode stainless steel, and Dynamic Cold Therapy doesn't recommend the stainless Cuboid in coastal regions. Its PVC-lined barrel is the coastal choice. Chat with us now and we'll help you choose.
What if something arrives damaged?
Photograph the packaging and the tub, then contact us within 48 hours of delivery. Chat with us now or email info@heavenlifewellness.com.
Wellness guidance
Chat with our wellness team
Questions about placement, plumbing, power or delivery? Start a chat any time for instant answers, and our team follows up on anything more detailed. We offer general product guidance, not individualized medical advice.