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Immersion Tub Luxury Hot & Cold Plunge
$11,999.00
$14,999.00
SAVE $3,000.00
Trusted by homeowners nationwide.
NW Immersion Exclusive
113° or 32°. Your call.
The Immersion Tub
Luxury hot & cold plunge. A true 32°F to 113°F range in a single 316 marine-grade stainless steel and red cedar tub — no separate chiller, no plumbing, no compromise.
Figure 1 — Temperature range
32°F to 113°F. Same tub. Same outlet.
The Immersion Tub covers the full working range in a single vessel — 32°F ice-forming cold to 113°F peak heat, on a standard 120V outlet. Session zones below are the recommended windows for each ritual.
Operating Range · Fahrenheit
32°–39°F
Ice-Forming
Freezes on its own. No ice bags.
39°–60°F
Cold Protocol
Recommended cold-therapy sessions.
95°–107°F
Warm Soak
Standard hot-tub territory.
107°–113°F
Peak Heat
Full capability. Short sessions.
What this means for you
One tub. Ice-cold recovery in the morning, warm soak at night. No dual plumbing, no dual outlets, no dual equipment closet.
Will I fit?
Built to fit you. Not fold you.
Most cold plunges force you to fold — knees jammed, shoulders half out of the water, ritual cut short. The Immersion Tub was engineered around a 316 marine-grade stainless interior long enough and deep enough to submerge fully. Shoulders under. Legs extended. Every session.
What this means for you
If you’re tall — or you’re buying for someone who is — you don’t have to compromise on the ritual. Full submersion. Full leg extension. Every day.
Why we build it this way
Five decisions that shape the tub.
316 marine-grade stainless, not acrylic. Real cedar, not veneer. 2HP compressor, not a repurposed dorm-fridge cooling coil.
Decision I
316 marine-grade stainless, welded & ground flat
Acrylic and fiberglass are cheaper to mold, but they scratch, host biofilm in the scratches, and fade. 316 marine-grade stainless — the alloy specified for marine hardware, pharmaceutical vessels, and coastal architecture — is more corrosion-resistant than the 304 alloy most tubs and appliances use. That matters here because the water is ozonated, cold-cycled, and treated. 316 handles it without pitting.
The corners are TIG-welded and ground flat. Run a wet hand down a seam and you'll feel a smooth transition, not a lumpy bead. And where the stainless top cap meets the cedar exterior, the metal folds over the edge and wraps down onto the wood — there is no caulk line to fail and no black seam to collect mildew. That detail on its own is worth taking a hand to in the showroom.
Decision II
Real western red cedar exterior
Western red cedar is naturally rot-resistant, dimensionally stable, and it silvers gracefully outdoors. We chose it over composite panels because the tub is meant to live outside if you want it to — and because a real wood exterior ages into character rather than fading into plastic.
Decision III
A real 32°F floor — with clean water to match
Most residential cold plunges bottom out around 39°F. The Immersion Tub can genuinely form ice — because the compressor is a 2HP commercial unit, not a scaled-down A/C part. And because ice-cold water has to stay clean, the tub includes built-in ozone sanitation and a 20-micron filtration loop. Sub-freezing capability plus clear water, out of the box.
Decision IV
Standard 120V household power
No 240V dedicated circuit. No electrician appointment. A single 120V / 15A grounded outlet — the outlet already in most garages and covered patios — runs the entire system. For best longevity we recommend covered use (patio roof, pergola, overhang), and the outlet must be weatherproof and GFCI-protected — an in-use bubble cover that stays sealed with the plug inserted. Have a licensed electrician verify local code.
Decision V · The architecture
All-in-one — one vessel does the whole job.
The chiller, heater, ozone system, and filtration all live inside the tub. There is no separate chiller box to hide, no run of insulated line to the garage, no external equipment closet. What arrives is what you install.
Sound
Not silent. Not a jet engine.
A cold plunge has a compressor. Every one on the market does. Instead of comparing ours to a whisper or a rainfall, we put a sound level meter on it. Here's exactly what we measured at our Vancouver showroom — TopTes TS-501B, A-weighted, slow response.
Compressor running
73.6dBA
3 ft from chillerStanding next to the tub during active cooling. The compressor pulling heat is what you're hearing.
In the tub, at ear level
72.6dBA
4 ft from chillerMeter held at water level, where your ear will be during a plunge. Compressor running.
For reference · same room
69.3dBA
Dreo tower fan on high · 3 ftA household stand-up fan on high setting, measured in the same room. Included as a familiar reference.
Pump only · compressor off
50dBA
3 ft from chillerWhen the compressor isn't running, the circulation pump alone measures around 50 dBA — quieter than a refrigerator, quieter than light rain, quieter than a normal conversation across a room.
The compressor makes noise. Here's exactly how much. We'd rather show you a meter reading than tell you it sounds like a rainstorm.
Measurements taken indoors at our Vancouver, WA showroom using a TopTes TS-501B sound level meter set to A-weighting, slow response. Real-world levels vary with ambient noise, room acoustics, distance, and whether the tub is installed indoors or outdoors.
Specifications
The plain-spoken sheet.
Performance
Compressor
2 HP commercial-grade
Cooling capacity
3,600 W (870–4,870 W)
Heating capacity
4,500 W (980–5,630 W)
Refrigerant
R410A
Temperature
Water range
32°F – 113°F
Ambient range (normal use)
33.8°F – 113°F
Ambient range (Ice-Making Mode)
42°F – 100°F (optimal 59°F – 86°F)
Water Management
Filtration
Built-in 20-micron cartridge
Filter type
Easy-change pleated
Sanitation
Ozone injection, timer-controlled
Control & Connectivity
Onboard control
LCD touchscreen
App control
Tuya Smart (iOS / Android)
Connectivity
WiFi 2.4 GHz
Construction
Interior
316 marine-grade stainless
Exterior
Red cedar
Insulated lid
Included, folds in half
Power
Electrical
120V / 60Hz
Circuit
Dedicated 15A grounded
Dimensions & Capacity
Overall dimensions (with lid)
81.5" L × 34.4" W × 31.75" H
Interior dimensions
58" L × 31.6" W × 24.6" D
Filled weight
Approx. 1,200 lbs
Fill capacity
85–100 gallons
User height accommodation
6'5"+ (shoulders under, legs extended)
Occupancy
Single adult
Sound level (measured, A-weighted)
3 ft, compressor running73.6 dBA
4 ft, in-tub at ear level72.6 dBA
3 ft, idle (compressor off)50 dBA
For reference: a Dreo tower fan on high measured 69.3 dBA at 3 ft in the same room. Measurements taken with a TopTes TS-501B sound level meter, A-weighting, slow response. See the full Sound section above for photos of each reading.
Model & Identifiers
Product type
All-in-one cold and hot plunge tub
Model / SKU
NWI-G9-2HP
Frequently asked
Answers to the most common questions.
How is one tub both hot and cold?
The Immersion Tub integrates both a 2HP compressor and a 4,500W heater in a single all-in-one unit. Set your target temperature on the LCD or in the Tuya app, and the tub cools or heats water to hold that setpoint.
Does it really make its own ice?
Yes. The 2HP commercial compressor can pull water down to 32°F and hold it there, forming a thin ice layer on the surface. Ice-Making Mode is designed for ambient temperatures between 42°F and 100°F, with 59–86°F optimal. Normal cold and hot use (DIY Mode) works across a wider ambient range of 33.8°F to 113°F — so the tub still runs on hot summer days or chilly winter mornings; it just may not auto-form ice outside the Ice-Making window.
Do I need a special electrical circuit?
No. The tub runs on a standard 120V / 15A dedicated grounded outlet — the same kind you already have in most garages and covered patios. It must be GFCI-protected and cannot share the circuit with other devices. For outdoor installs, the outlet must be a weatherproof, in-use (bubble-cover) receptacle that stays sealed against rain, snow, and splash while the plug is inserted. Have a licensed electrician verify the receptacle meets local code before you plug in.
Where can I put it?
Indoors or outdoors, on any flat, waterproof surface that supports 1,200 lbs — reinforced concrete, tile over a reinforced subfloor, engineered pavers, or a purpose-built deck rated for spa loads. Leave 11.8" clearance on both sides and 27.5" at the rear. For best longevity we recommend covered use — a patio roof, pergola, or overhang — so the control head and cedar shell aren't taking direct rain or sun year-round. The electrical outlet must be weatherproof and GFCI-protected regardless of where the tub sits (see “Do I need a special electrical circuit?” above).
How do you keep the water clean?
Three things working together: built-in ozone sanitation with an adjustable timer, a triple filtration loop with a 20-micron easy-change cartridge, and cold storage temperatures (below 55°F) that inhibit microbial growth between sessions. Ozone destroys bacteria and viruses, then reverts to oxygen — no added chemicals required for baseline sanitation.
Optional supplemental treatment. If you want to extend water clarity between drain-and-fill cycles, two options are approved in the owner's manual: 3% food-grade or medical-grade hydrogen peroxide (4–8 oz once or twice per week after use — never industrial-grade), or a natural enzyme-based treatment used per the manufacturer's instructions to break down oils and organic matter.
What not to use: chlorine or bromine tablets (formulated for hot tubs — they corrode components at cold temperatures), salt water (accelerates corrosion of the stainless steel and internal plumbing), or industrial-grade peroxide and strong oxidizers.
Do I need a plumber?
No. The tub fills from a standard garden hose and drains through the included stainless drain fitting and clear drain tube. No dedicated water line, no drain plumbing.
What does it cost to run each month?
Honest answer: it depends on how you use it. For cold-only use in a moderate climate with the insulated lid on between sessions, budget roughly $20 to $45 per month in electricity at U.S. average rates (~18¢/kWh, EIA). That range is where most well-insulated home cold plunges land — hot climates, uncovered use, or aggressive ice-making pushes it higher; cool climates and disciplined lid use pull it lower.
Hot-tub use is a different animal. The 4,500W heater is what pulls the wall when you're holding the tub at 104°F, and heater cost scales with how often you use it hot and how cold your outdoor ambient is. If you plan to run it as a hot tub daily through a Pacific Northwest winter, expect that side of the bill to be materially higher than cold-only operation.
Want an exact number for your situation? Plug the tub into a Kill-A-Watt meter for a week and multiply by your local rate. That's the only way to get a real answer — everyone else's guess is just a guess.
How often do I change the filter and the water?
Straight from our owner's manual — the same schedule we tell every owner:
- Rinse the filter weekly under a garden hose. Takes about 90 seconds.
- Replace the filter every 4 to 6 weeks, or sooner if it stops rinsing clean. Two cartridges ship with the tub — one pre-installed, one spare. Replacements are $15 each in packs of three.
- Drain, clean, and refill the tub every 3 to 6 months, or sooner if water looks cloudy, foamy, or off. Ozone plus a small weekly peroxide dose stretches water life closer to the 6-month end for most owners.
One-touch drainage through the stainless ball valve and included clear drain tube makes the full water change a garden-hose job, not a plumbing project.
Can I use it outdoors year-round in a cold climate?
Yes, with two rules. First, the tub itself is rated for outdoor operation as long as ambient temperature stays above 34°F. In Ice-Making Mode, the compressor works most efficiently between 42°F and 100°F ambient (optimal 59°F to 86°F). Below 34°F ambient — hard freeze territory — you either need to keep the tub running (circulation and freeze protection prevent internal ice), or fully winterize and drain per the manual.
Second, the electrical side has to be weatherproofed. The outlet must be GFCI-protected and rated for outdoor use, with a weatherproof in-use cover. Keep the tub covered when you're not in it — the insulated lid protects the water from debris, holds temperature, and materially reduces run-cost. If the tub will be unused for 7+ days in freezing weather, drain it: freeze damage is not covered under warranty.
How long does setup take, and do I need tools?
Plan for about 45 to 60 minutes of hands-on work, plus fill time. No tools required for the basic setup.
- Uncrate and place the tub — 20 to 30 minutes with a helper. Two people can move it into position on a level surface (concrete pad, deck rated for the load, or firm patio stone).
- Connect the drain fitting and clear drain tube — 5 minutes. Teflon tape included.
- Fill with a standard garden hose — about 60 to 90 minutes to reach 100 gallons.
- Plug in, set temperature via the touch screen or WiFi app, run the initial filter cycle — 10 minutes of setup, then the chiller starts working.
First cool-down from tap-water temperature to a plunge-ready 40–50°F takes a few hours depending on starting temperature and ambient. After that, the tub holds temperature on its own — you're not restarting from warm every time.
What's the warranty?
The Immersion Tub is protected by NW Immersion's limited warranty covering manufacturing defects in materials and workmanship. Save your receipt — warranty claims require proof of purchase. Full terms are included in the owner's manual.
How heavy is it, and can my deck hold it?
Filled, the tub weighs approximately 1,200 lbs. Reinforced concrete and tile over reinforced subfloor are fine. For elevated wood decks and balconies, consult a licensed contractor or structural engineer to verify joist spacing, span, and support posts meet local code for spa loading.
How loud is it?
Honest answer, with actual meter readings instead of marketing copy. Measured at our Vancouver showroom with a sound level meter (A-weighted, slow response):
- 73.6 dBA at 3 feet during active cooling. Compressor pulling heat.
- 72.6 dBA at 4 feet from the chiller — in-tub at water level, where your ear will be during a plunge.
- 50 dBA at 3 feet, pump only. When the compressor isn't running, the circulation pump alone measures around 50 dBA — quieter than a refrigerator.
For reference, a Dreo tower fan on high in the same room measured 69.3 dBA at 3 feet. A cold plunge has a compressor. It's louder than silence and quieter than a lot of things in your house.
Do you deliver, and is freight included?
Yes. Free freight to the contiguous United States is included in the price. Standard delivery is curbside on a lift-gate truck.
White Glove delivery — which includes placement and packaging removal — is available as an optional upgrade. White Glove placement is to the first floor only. No stairs. Contact info@nwimmersion.com for a quote.
What if I need to return it?
You can request a return within 30 calendar days of delivery, as long as the tub is still in its original factory crate — unopened, uncrated, uninstalled, and unused. A 10% restocking fee applies, and you're responsible for the actual original outbound freight and the return freight, which are deducted from your refund. Once we receive and inspect the returned unit (within 5 business days), your refund is issued to the original payment method within another 5 business days.
Orders can be cancelled free of charge within 24 hours of purchase, or up until your order enters documented fulfillment. After fulfillment but before shipment, a fixed 5% cancellation fee applies. Once the tub has shipped, our return terms apply instead.
Opened, uncrated, assembled, or used tubs are not returnable — functional issues at that point are handled under warranty. Shipping damage must be noted on the delivery receipt and reported within 7 days.
Every return starts with an RMA — email info@nwimmersion.com with your order number. Full terms: Returns, Refunds & Cancellations.
Why buy The Immersion Tub from NW Immersion directly instead of a marketplace?
The Immersion Tub is our own product — an NW Immersion Exclusive built to our specifications. When you buy it from us, you buy it from the people who designed it. You get direct access to our Vancouver, Washington team for support, our full manufacturer's warranty on the record, and human help — not a marketplace ticket queue — whenever a question comes up.
Is cold-water immersion safe for me?
Cold-water immersion can cause hypothermia, shock, cardiac stress, and in extreme cases loss of consciousness. Consult a physician before use if you have heart disease, blood pressure issues, diabetes, epilepsy, Raynaud's syndrome, or any chronic condition. Do not use the tub after alcohol, drugs, or medications that cause drowsiness. Never sleep in the tub, and never leave it uncovered and unattended.
How should I start if I've never plunged before?
Begin at 55–60°F for 1–3 minutes and progress deliberately over several weeks. Never exceed ten minutes below 50°F, even for experienced users. Allow at least four hours between cold sessions, and no more than two sessions per day. Warm gradually afterward — let your body rewarm naturally over 15–20 minutes rather than jumping into a hot shower.
Support
Talk to a human before you buy.
The Immersion Tub is our own brand — not a marketplace product from a supplier we've never met. You're buying it directly from the small team that designed it, sourced it, and stands behind it. That means when you have a question, you get a person on the phone or email who actually knows the product.
Real people. Direct line. No ticket queue.
Every tub we ship comes with our full warranty and direct-from-manufacturer service. We answer sales questions the same day. Warranty claims and technical questions get handled by the same people who packed the crate, not a call center on another continent.
Sales
Support
Phone
Hours
Thursday – Saturday
10am – 4pm PT
10am – 4pm PT
In the Pacific Northwest? Our showroom at 5305 NE 121st Ave Ste 216, Vancouver, WA is open Thursday–Saturday, 10am–4pm PT. Come sit in the tub before you buy — not required, but you're welcome.
HSA & FSA Eligible. learn more.
Purchase with Confidence
- Premium Craftsmanship & Manufacturer Warranty
- Expert Guidance Before, During & After Delivery
- Personalized Delivery Planning & Coordination
- Real Sauna Specialists Just a Call, Text or Chat Away
Frequently Asked Questions
Trusted By Elite Athletes
Built for Peak Performance
The Immersion Tub is used by professional athletes, performance coaches, and wellness enthusiasts seeking consistent recovery, resilience, and peak performance.
Cold exposure is a major weapon in my training. The Immersion Tub delivers that clean, sub-40 degree shock that resets my body and mind so I can go again tomorrow.
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Thurs – Sat: 10 AM – 4 PM
Sun-Wed: By Appointment - call/text: 360-360-6968 to schedule
5305 NE 121st Ave, Ste 216 Vancouver, WA 98682