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Steam & Oak PortaPlunge Cube

Inflatable or portable tub by Steam & Oak. UK price £395. Not tested by us

Steam & Oak PortaPlunge Cube, inflatable or portable tub
Image: Steam & Oak

Specifications

Type
Inflatable or portable tub
Capacity
Not stated
Includes chiller
No
Material
Drop-stitch PVC, insulated wall
Insulation
Not stated
Dimensions
Not stated
Weight (empty)
Not stated
Voltage
Not stated
Filtration
Not stated
Outdoor use
Yes
App control
Not stated
Warranty
Not stated
Ships to UK
Yes

Price and where to buy

£395
UK retail price at last check, .

Check price at Steam & Oak

Price history

Unchanged at £395 since , across 3 checks of Steam & Oak's own store.

Our take

The Steam & Oak PortaPlunge Cube is an inflatable or portable tub sold in the UK at £395.

Key specifications: Drop-stitch PVC, insulated wall construction, no chiller included.

Its UK price has held steady across the 3 checks in our price history.

We have not tested this unit ourselves; the take below is built from the maker's specifications, the UK price and what owners report.

What to buy with it

  • There is no filter on this tub, which means draining it often or treating the water. Bio Ouster 3-in-1 weekly cold plunge treatment (£48.86 at Amazon UK, 4.5 stars from 543 ratings)
  • On patio slabs, grit wears through a pod's base; a hot tub floor protector cushions it and adds a little insulation from the ground. Lay-Z-Spa 10-piece floor protector (£35.04 at Amazon UK, 4.4 stars from 6,666 ratings)
  • With no chiller there is no display, and it matters whether the water is at 8C or 14C. Intex floating pool thermometer (£7.49 at Amazon UK, 4.4 stars from 4,444 ratings)

Lids, filters, water care and what not to buy: our cold plunge accessories guide.

Notes from the manufacturer page: PortaSauna's single-person inflatable sold by Steam & Oak; cooled with ice or ambient water; no chiller ports mentioned. Capacity, lid and warranty not stated. Specifications verified 2026-09-23.

Cold water immersion places real stress on the heart and circulation. Anyone with a cardiovascular condition, high blood pressure, a history of arrhythmia, or who is pregnant should speak to a doctor before using a cold plunge. Never plunge alone. Start with short sessions at mild temperatures and progress gradually. Read the full safety guide.

Some links on this page are affiliate links. If you buy through them we may earn a commission from Steam & Oak at no extra cost to you. Commission does not decide verdicts; see our affiliate disclosure.