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)
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.
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.