BlueCube C3 Stainless Cold Plunge Tub with Side Deck
- 33-37°F minimum
- Up to 80 gal
- 0.8-1 HP chiller
- Cold only
SVT Score, Top
A chill-only two-pump stainless cold plunge with a side deck and a 13,600 BTU/hr chiller, rated to 37°F or 34°F by its pages.
$20,500
We may earn a commission if you buy through this link. It never affects our scores. How this works
Usability
6.1 out of 10- Horsepower: 1.5 HP+ now, 1 HP on an older page
- Cabinet: Line-X coated plywood, spray-foam insulation, thickness not stated
- Pumps: two ¼ HP Iwaki magnetic-drive pumps
- Searched: Intertek UL CSA CPSC Health Canada
- Tub: 15 years on the stainless tub and frame; technician travel may be charged
- Option: Commercial package $4,500.00 at bluecubebaths.com
Strengths
- Coldest setting in the range
- Marine-grade stainless tub
- Two pumps give a strong flow
- Phone app control comes standard
- Chiller sized well above the tub volume
Drawbacks
- Cold-only with no heater
- Its pages disagree on the coldest setting
- Needs its own dedicated outlet
- Very expensive for a home plunge
- Store pages make wellness claims we do not assess
The coldest stainless tub in the range, but it has no heater
Specs
- TypeRigid
- HeaterNot applicable
- FormTub
- PlacementIndoor or outdoor
- SeatsNot applicable
- Max TemperatureNot applicable
- Min Temperature33-37°F
- Capacity (Gallons)Up to 80 gal
- Chiller0.8-1 HP
- HeatsCold only
- Water CareFilter, Ozone
- Power Supply120V dedicated (20A)
- EMF ClaimedNot applicable
- EMF MeasuredNot applicable
- CertificationsNone verifiable
- Warranty3 Years
At a glance
- Hardwood side deck
- 72 in tub at same price
- Runs under 60 dB
BlueCube Wellness LLC of Redmond, Oregon, founded in 2019, builds cold plunge tubs from a 33-inch upright aluminum tub to a 72-inch stainless sit-in tub.
- It sells them in the US through its own store at bluecubebaths.com and ships each tub curbside in the lower 48 states.
- No BlueCube store or listing was found on Amazon US in November 2026.
The BlueCube C3 is a chill-only lay-down cold plunge with a 14-gauge 316-L stainless tub in a Line-X coated plywood cabinet and a hardwood side deck for a slower entry. The 66 inch tub measures 66 by 24 by 22 inches inside with a 72.5 by 48.5 by 28.5 inch footprint; the 72 inch tub costs the same.
The current page and cost page rate it from 34°F to 70°F with a 13,600 BTU/hr (1.5 HP+) chiller and no heater; an older brand page lists 37°F to 70°F and a 1 HP chiller, and the brand FAQ puts the C-line at 80 to 100 gallons.
Two ¼ HP Iwaki pumps circulate the water through a 20 micron filter with automatic ozone, with app temperature control and running under 60 dB. It needs a dedicated 120 V 20 A circuit or can be hardwired, and ships with a GFCI cord, an insulated cover with child locks and a maintenance kit.
The commercial package adds $4,500.00, a custom colour $2,500.00, reverse plumbing $2,000.00 and powder-coated screens $1,000.00.
Questions answered from our data
Is BlueCube good?We list five BlueCube products and score five of them. Their overall scores run from 5.5 to 6.2, with a median of 5.7, against a median of 5.3 for all 91 products we score.
How much does a cold plunge cost?The 62 cold plunges we list run from $549 to $28,880, with a median of $7,495.
How cold does a cold plunge get?32 of the 62 cold plunges we list are rated to hold water at 37°F or colder, as their makers rate them.
How many gallons is a cold plunge?30 of the 62 cold plunges we list hold more than 100 gallons, as their makers rate them.
