Nightjar Sauna
Cold Plunge
Tenth-generation engineering. Heirloom-grade craft.
Nine versions came before this one. Each taught us something about filtration under real bather loads, sanitation in cold water, and what breaks when equipment runs 24 hours a day for years. Version ten is what's left when you've solved all of it.
A full commercial unit — the same machine we place in spas and athletic facilities — clad in hand-selected Grade A cedar so it belongs beside your sauna, not hidden behind it.
It's never been this beautiful to be this cold.
- Designed as the second half of a sauna. Same cedar, same stains, same hands.
- Commercial equipment, residential grace. 1 HP chiller, stainless tub, rust-proof aluminum frame.
- 170 gallons — where the category's best-known plunges hold 105–110.
- Water chemistry we publish. The actual protocol, free. Read the Water Guide.
Download the V10 Spec Sheet (PDF)
Add this plunge to your sauna order.
We’ll cover the extras.
Contrast therapy — hot, then cold — is a true reset. Add a plunge to your sauna order, and we’ll take care of the rest to get you in.
Free shipping
On the whole order — sauna and plunge, delivered and placed by our crew.
Free stain upgrade on your plunge
Matched to your sauna’s finish, on the house. Your sauna stain is priced as usual.
Included on Neighbor and Local deliveries when a cold plunge is added to a sauna order. The Long Haul doesn’t qualify.
Full Specifications
- Tub: Stainless steel; single slanted side at the mechanical end — all three water penetrations live there, keeping every visible side clean and sealed
- Frame: Powder-coated aluminum — rust-free by nature
- Cladding: Premium Grade A cedar — natural, black, or custom stain
- Capacity: 170 gallons total (125-gallon recommended fill)
- Temperature: 36°F – 60°F+, fully adjustable
- Chiller: 1 HP commercial-grade (870W, 8A)
- Pump: 360W, 3A — continuous circulation by design
- Sanitation: Integrated ozone, programmable cycles
- Filtration: Commercial cartridge filtration
- Electrical: Dedicated 110–120V, 20A GFCI circuit
- Weight: 375 lbs dry / ~1,400 lbs full
- Lid: Insulated, waterproof, locking
- Bay access: CNC-routed Starboard top — tool-free access to filter and timers
- Included: Submersible drain pump, GFCI power cord, starter filter, LED underglow on programmable timer
- Dimensions: Confirmed at your consultation
Performance
Cold that holds. The oversized 1 HP chiller pulls to 36°F and stays there — through triple-digit Texas summers, back-to-back sessions, and a Michigan January that would kill lesser equipment. Indoors or out, year-round.
Circulation that never sleeps. The pump runs 24/7 by design — there is deliberately no off switch. Continuous circulation keeps water polished, ozone effective, and pipes freeze-proof.
Sanitation, sized to your use. Residential plunges run chemical-free on integrated ozone. As bather load rises, our published water treatment plan scales the protocol from a private backyard to forty plunges a day.
Delivery & Lead Time — under 30 minutes to first plunge
1 · Place. Arrives fully assembled — longer hauls ship crated, and the only assembly is the handle. These are heavy, wide units: we confirm doorways, gates, and the path in before it ever ships.
2 · Fill. Garden hose to the etched line — about 10 minutes. Plug into your dedicated 20A GFCI outdoor circuit.
3 · Plunge. Set your temperature and you're in the water the same day. Most people start at 50–55°F; the seasoned crowd lives in the mid-40s and below.
Hand-built to order — current lead time 6–8 weeks. Shipping from $250 by distance and crating. A deposit locks your build slot. Adding this plunge to a sauna order? Shipping on the whole order is on us for Neighbor and Local distances.
Limited Warranty
- 10 years — stainless tub & aluminum frame
- 2 years — chiller, pump, ozone & electrical
- 2 years — craftsmanship: cedar cladding & finish
- 30-day satisfaction guarantee (return freight + 25% restocking fee apply; custom stains non-returnable)
Direct-from-builder support — a builder answers, not a call center. Full plain-English terms.
Studios, Gyms & Spas
This is the commercial unit — we don't make a lighter one. 170-gallon buffer, lockable lid, tamper-proof controls, and sanitation configurable for high bather loads. Ask about high-bather-load water treatment and health department documentation.
Owner Guides — published free, no login
- Cold Plunge FAQ — every question, answered straight
- Setup & First Plunge — delivery to cold water in 30 minutes
- Care & Maintenance — the honest 5-minutes-a-week routine
- Keeping Cold Plunge Water Clean — the full chemistry, from the Nightjar Lab
- Warranty & Service — what's covered, plainly
- Ten Generations — nine versions of lessons, one plunge
Ready when you are. Start with the inquiry form — we'll schedule a consultation, review your site, and confirm your quote.
Cold water is a genuine physiological stressor. Consult a doctor if pregnant or managing cardiovascular, blood pressure, or respiratory conditions. Never plunge alone. Nightjar cold plunges are wellness equipment, not medical devices.