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Kaldera Cold Therapy Plunge 320

Inflatable or portable tub by Kaldera Cold Therapy. UK price £109. Not tested by us

Kaldera Cold Therapy Plunge 320, inflatable or portable tub
Image: Kaldera Cold Therapy

Specifications

Type
Inflatable or portable tub
Capacity
320 L
Includes chiller
No
Material
3-layer PVC shell, powder-coated steel frame
Insulation
Not stated
Dimensions
Not stated
Weight (empty)
Not stated
Voltage
Not stated
Filtration
Not stated
Outdoor use
Not stated
App control
Not stated
Warranty
Not stated
Ships to UK
Yes

Price and where to buy

£109
UK retail price at last check, .

Check price at Kaldera Cold Therapy

Our take

The Kaldera Cold Therapy Plunge 320 is an inflatable or portable tub sold in the UK at £109.

Key specifications: 320 litre capacity, 3-layer PVC shell, powder-coated steel frame construction, no chiller included.

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

  • Without a chiller this tub relies on tap water and ice. If you add one later, Kaldera Cold Therapy sells the Chill Core 300 at £599. Ask Kaldera Cold Therapy to confirm it fits this tub's ports. Kaldera Cold Therapy Chill Core 300
  • 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)

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

Compare with alternatives

Notes from the manufacturer page: Foldable, insulated lid, fits adults up to 6ft 4. 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 Kaldera Cold Therapy at no extra cost to you. Commission does not decide verdicts; see our affiliate disclosure.