Best Cold Plunge With a Chiller
For buyers who've already decided they want an integrated chiller — not ice, not a separate unit — here's how the top options compare.
Plunge All-In
Strengths
- + 1 HP integrated chiller reaches 37°F
- + No external plumbing or separate chiller placement needed
Tradeoffs
- − Highest price of any product in this guide
- − Requires a dedicated 120V/20A circuit
Warranty: 1-year manufacturer warranty. Source: plunge.com.
Renu Cold Stoic 3.0
Strengths
- + Doubles as a warm soak with the 37–104°F range
- + 5-year warranty, longest in this guide
- + 104-gallon capacity
Tradeoffs
- − 0.5 HP chiller is less powerful than Plunge's Pro tier
Warranty: 5-year limited warranty. Source: www.renutherapy.com.
Renu Vero
Strengths
- + 0.8 HP chiller fits a compact upright shape
- + Optional heater adds warm-soak range
Tradeoffs
- − 95-gallon capacity is the smallest of the integrated-chiller options here
Warranty: 5-year limited warranty. Source: www.renutherapy.com, avidaffiliate.com.
The Plunge
Strengths
- + Pro chiller upgrade reaches 37°F, matching pricier competitors
- + Most mainstream support ecosystem
Tradeoffs
- − Base configuration chiller only reaches 39°F — Pro tier costs more
Warranty: 1-year manufacturer warranty (extended terms offered periodically). Source: plunge.com, plunge.com, account.fmtc.co.
Chiller HP vs. minimum temperature
Higher horsepower chillers generally reach lower minimum temperatures faster, but climate, insulation, and tub size all affect real-world results.
| Product | Chiller | Min temp | Capacity |
|---|---|---|---|
| Plunge All-In | 1 HP integrated | 37°F | 105 gal |
| Renu Cold Stoic 3.0 | 0.5 HP | 37°F | 104 gal |
| Renu Vero | 0.8 HP | 37°F | 95 gal |
| The Plunge (Pro chiller) | Undisclosed HP (Pro tier) | 37°F | 105 gal |
FAQ
Do I need the maximum HP chiller available?
Not necessarily — HP needs depend on ambient temperature, tub insulation, and how often you refill or top off water. A smaller HP unit in a well-insulated tub can perform comparably.
Can I retrofit a chiller onto a barrel-style plunge?
Some barrel brands sell compatible add-on chillers separately — check compatibility with the specific barrel model before buying a third-party unit.