Renu Therapy — Cold Stoic Pure
The cedar-wrapped premium reference, built like a Japanese onsen.
A cedar-wrapped horizontal plunge that hits 34°F and holds it forever — the closest production unit to a custom onsen.
If the Plunge Pro is the Toyota of cold plunges, the Renu Cold Stoic Pure is the Lexus LX. Same chillered category, completely different conversation. Cedar exterior, horizontal full-body immersion, hits 34°F (the Plunge bottoms out at 39°F), 60-month tub warranty, and a presence in a room that other tubs simply don't have.
It's also nearly 2x the price. For a buyer making a single $15K decision on home recovery infrastructure, that math can absolutely work — but only if the cedar aesthetic and sub-39°F temperatures actually matter to you. If they don't, you're paying for jewelry.
The service network is smaller than Plunge's, the 320lb empty weight means you need to think about indoor floor loading, and cedar requires periodic re-treatment outdoors. None of those should disqualify a serious buyer; all of them should be priced into your decision.
Premium-aesthetics buyers who want sub-39°F temperatures, the longest warranty in the category, and a tub that reads as architecture.
You're budget-constrained, want apartment-friendly install, or don't care about premium materials.
Pros
- Hits 34°F — coldest mainstream production target
- 60-month tub warranty (industry-leading)
- Cedar — premium aesthetic, naturally antimicrobial
- Horizontal full-body immersion
- Made in USA
Cons
- Premium price — 1.5-2x Plunge Pro
- Heavy (320lb empty) — floor loading matters
- Cedar requires periodic re-treatment outdoors
- Smaller service network than Plunge
Specifications
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Renu Therapy — Cold Stoic Pure
$13,995–$14,995 · Verified 2026-05-03
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