The best cold plunge chillers of 2025
This is our annually-updated list of the best cold plunge chillers, organized by use case. Every chiller on this list has been verified for: minimum temperature capability, noise levels, warranty, and real-world performance.
Quick picks
- Best overall for 50-gal builds: EONIX 1/2 HP ($649)
- Best budget pick: 1/3 HP chiller bundle ($449)
- Best for large tubs (100+ gal): AS ColdPlunge 1 HP bundle ($1,899)
- Best premium pick: 1/2 HP alternative ($629)
Best overall: EONIX 1/2 HP
The EONIX 1/2 HP Cold Plunge Chiller is our default recommendation for 50-gallon DIY plunges. It hits the sweet spot of price ($649), performance (41°F min temp), noise (30-40 dB), and reliability (5-8 year lifespan). Includes built-in pump, filter, and insulated hoses.
Best for: 50-gal tubs in garages or basements, intermediate practitioners, DIYers who want plug-and-play.
Limitations: 41°F min temp (not 39°F), 1-year warranty, no built-in thermostat (requires Inkbird).
Best budget: 1/3 HP chiller bundle
The 1/3 HP Ice Bath Chiller with Built-in Filter & Pump is the smart pick for smaller tubs (under 50 gallons) or budget builds. At $449, it includes everything you need (chiller, pump, filter, hoses) and cools a 30-50 gallon tub to 41°F in 4-6 hours.
Best for: Budget builds, small tubs (25-50 gal), occasional users.
Limitations: Slower recovery time after warm entries, slightly louder than EONIX, may struggle in hot garages.
Best for large tubs: AS ColdPlunge 1 HP bundle
If you're running a 100+ gallon tub (like The Cold Pod 85-gal or a large stock tank), step up to the AS ColdPlunge 1 HP Chiller + Tub Bundle ($1,899). It pairs commercial-grade 1 HP cooling with a 216-gallon tub — approaching commercial plunge territory at 1/4 the cost.
Best for: 100+ gallon tubs, multiple daily users, commercial-like performance.
Limitations: Expensive, larger physical size, requires dedicated 20-amp circuit.
Best premium: 1/2 HP alternative
The 1/2 HP Cold Plunge Chiller (1200W) is a strong alternative to the EONIX. Similar specs (1/2 HP, 41°F min, 1200W cooling capacity) but slightly different build. Good option if EONIX is out of stock or you want a backup choice.
Best for: Users who want EONIX performance with a different brand, or as a backup option.
Limitations: Less established brand reputation than EONIX, similar warranty terms.
How we tested
Our recommendations are based on:
- Spec verification: Every chiller's HP, min temp, noise, and power draw verified against manufacturer specs
- Real-world cooling tests: Time from 65°F tap water to target temp in standardized 50-gal insulated tub
- Noise measurement: dB readings at 3 feet from chiller
- Community feedback: Aggregated reviews from DIY cold plunge communities (Reddit r/coldplunge, Facebook groups)
- Warranty and support: Verified warranty terms and manufacturer responsiveness
- Price tracking: CamelCamelCamel price history for value assessment
Comparison table
| Chiller | HP | Min temp | Noise | Price | Best for |
|---|---|---|---|---|---|
| EONIX 1/2 HP | 1/2 | 41°F | 30-40 dB | $649 | 50-gal builds (best overall) |
| 1/3 HP bundle | 1/3 | 41°F | 40-50 dB | $449 | Budget builds |
| AS ColdPlunge 1 HP | 1 | 39°F | 45-55 dB | $1,899 | Large tubs (100+ gal) |
| 1/2 HP alt | 1/2 | 41°F | 40-50 dB | $629 | EONIX backup option |
How to choose
Step 1: Determine your tub size
Use our chiller sizing calculator to determine the right HP for your tub.
Step 2: Check your ambient temperature
Indoor (70°F): standard sizing works. Garage (85°F): may need one size up. Outdoor (95°F): definitely size up.
Step 3: Set your budget
$400-500: 1/3 HP budget tier. $550-700: 1/2 HP mid-tier (sweet spot). $900-1,800: premium tier.
Step 4: Consider noise
Indoor installation: prioritize quiet (EONIX, 30-40 dB). Garage: any 40-50 dB chiller is fine. Outdoor: 50-60 dB acceptable.
Step 5: Check warranty
1 year minimum. 2 years preferred. Avoid 30-90 day warranties (cheap unbranded chillers).
Common questions
Should I buy a chiller or use ice?
If you'll plunge 3+ times per week for more than 12 months, buy a chiller. Use our chiller vs ice comparison to see the break-even math.
Can I install a chiller myself?
Yes — most consumer chillers are plug-and-play. You'll need basic plumbing skills (cutting PVC hose, installing bulkhead fittings) and electrical awareness (GFCI outlet required). See our master build guide.
What's the quietest cold plunge chiller?
The EONIX 1/2 HP at 30-40 dB (whisper quiet, comparable to a refrigerator). For comparison: Penguin and Oxcart run 45-55 dB. Cheap unbranded chillers can hit 55-60+ dB.
How long do cold plunge chillers last?
5-8 years with proper maintenance. Compressor failure is the most common end-of-life failure mode. To maximize lifespan: keep condenser coils clean, never run dry, use surge protector, winterize if freezing.
The complete chiller package
- EONIX 1/2 HP chiller — The chiller itself
- Inkbird ITC-308 — Temperature controller (required)
- PVC spa hose — Plumbing
- Food-safe silicone — Sealing
- GFCI adapter — Safety
Buy your chiller on Amazon with a credit card that offers extended warranty protection (many add 1 year to manufacturer warranty). This effectively doubles your warranty for free. Also: track prices with CamelCamelCamel — chillers go on sale periodically, especially Prime Day (October) and Black Friday.
For the full chiller buyer's guide, see our chiller guide. For sizing help, see our chiller sizing calculator. For EONIX review, see our EONIX review.