The KPlunge CP-CH7939BL Borealis is a 1-person all-in-one cold plunge and hot tub in blue acrylic, with the chiller and heater built into the cabinet so the water holds anywhere from 37°F to 104°F without a separate unit. At 78.7" L x 39.4" W x 29.5" H it is the larger of the KPlunge all-in-one tubs, made for buyers who want a long, deep shell, music and lighting in a plunge that lives on a patio, in a garage or in a home gym.
Plunge, Soak and Unwind
Inside, the shell drops to 26.4" deep at the plunge end with a raised 23.6" section, so you can sit fully under or recline. Two hydro jets give a gentle massage, built-in Bluetooth speakers in the skirt play your music, and underwater lights plus color-changing chassis lights set the mood. The blue acrylic shell reads like open water under the underwater lights.
With the chiller and heater in one cabinet, a cold plunge at 37°F in the morning and a warm soak at 104°F in the evening are a set point apart. SaunaSpa recommends keeping cold plunge sessions to no more than ten minutes and testing the water with an accurate thermometer before you get in, since temperature controls can read up to 5°F off; the warm setting tops out at 104°F.
Smart Controls and Clean Water
Control runs from the LCD touch panel or the Smart Life app over 2.4 GHz WiFi: set the temperature, switch the jets and lights, schedule on and off times, and choose Smart, Powerful or Silent auto mode. An ozone sterilizer and a replaceable filter cartridge keep the water clean and clear, and antifreeze protection runs the pump for 30 seconds every 10 minutes when the air is at or below 41°F, and heats the water if the outlet water also falls to 34°F. Clean the filter cartridge at least once a month and plan on fresh water about every 2 months.
Sizing, Power and Placement
The Borealis measures 78.7" x 39.4" x 29.5" and runs on 120V AC, 60Hz at 1600 W through its GFCI power cord, which must plug into a GFCI-protected circuit with no extension cord, with the RCD/GFCI breaker at the main panel. Plan a smooth, level base that carries the full weight without shims, 3 ft of clearance around the cabinet, and a drain path for the condensation line; the cabinet is rated for ambient temperatures from 0°F to 104°F.
The acrylic tub sits on a stainless steel frame with a removable skirt for service access. It draws 1600 W on 120V AC, 60Hz through its GFCI cord, and quick-connect hoses, wheels and a carry handle make it easier to set up and move.
The Borealis comes in blue (CP-CH7939BL) and white (CP-CH7939WH), and SaunaSpa pairs both with its outdoor barrel saunas in the AZOTBL3 and AZOTBL4 sauna and cold plunge sets. Next to the compact Iroquois (CP-CH6732N), it is the larger all-in-one with two jets, speakers and full lighting, and the KPlunge CP-CH7939BL gives you one blue tub that chills, heats, filters and plays music on a 120V GFCI-protected circuit.
Features
Chill and Heat in One Tub
The built-in chiller and heater set the water anywhere from 37°F for a cold plunge to 104°F for a warm soak, with no separate chiller, hoses or ice to manage.
Long, Deep Shell
At 78.7" long with a 26.4" deep plunge end and a raised 23.6" section, the shell lets a tall adult sit fully under or recline.
Dual Hydro Jets
Two hydro jets move the water across your body for a gentle massage, and moving water makes a cold plunge feel colder than still water.
Bluetooth Speakers
Speakers built into the skirt play music from your phone over Bluetooth, so a few cold minutes or a long warm soak pass more easily.
Underwater and Chassis Lighting
Underwater lights and color-changing chassis lights make the blue shell glow at night and switch from their own key on the control panel.
App Control With Modes and Timer
The Smart Life app on 2.4 GHz WiFi or the LCD panel sets the temperature, Smart, Powerful or Silent mode and an on and off schedule.
Ozone and Replaceable Filter
An ozone sterilizer and a pleated, replaceable filter cartridge keep the water clean, clear and odor free between water changes.
Plugs Into 120V Power
The tub draws 1600 W on 120V AC, 60Hz through its GFCI cord, on a GFCI-protected circuit with a breaker at the main panel, installed by a qualified electrician, and never an extension cord.
Specifications
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Model: CP-CH7939BL
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Capacity: 1 person
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Dimensions: 78.7" L x 39.4" W x 29.5" H
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Interior Depth: 26.4" (23.6" at the raised section)
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Water Temperature Range: 37°F to 104°F
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Chiller: Built-in chiller and heater
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Power: 1600 W, 120V AC, 60Hz; GFCI power cord
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Jets: 2 hydro jets
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Color: Blue
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Material: Blue acrylic, stainless steel frame, removable skirt
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Controls: LCD touch panel and Smart Life app (2.4 GHz WiFi); Smart, Powerful and Silent modes; timer; child lock
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Audio: Built-in Bluetooth speakers
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Lighting: Underwater lights and color-changing chassis lights
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Water Care: Ozone sterilizer and replaceable filter cartridge
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Ambient Operating Range: 0°F to 104°F
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Use: Indoor or outdoor
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Warranty: 1 year (cold plunge; register within 90 days)
What's Included
- All-in-one cold plunge with built-in chiller and heater
- GFCI power cord (attached)
- Quick-connect hoses
- Drain hose connector
Installation & Care
Installation
Place the plunge on a smooth, flat, level base that can carry the weight of the tub, water and bather without shims, with at least 3 ft of clearance on all sides for service and airflow; avoid direct sun, unguttered roof edges and spots where the expelled air recirculates. Indoors, plan ventilation for moisture and a floor that drains, and route the condensation line to a drain. It runs only on its supplied 120V GFCI cord at its original length, never an extension cord, into a GFCI-protected circuit with a breaker at the main panel installed by a qualified electrician; metal surfaces within 5 ft must be bonded with 10 AWG solid copper. Two people should remove the skirt doors to reach the equipment bay; unplug the Bluetooth module before removing the speaker door.
Care
Clean the pleated filter cartridge at least once a month (unplug, remove the filter cover screws and baffle, twist out the cartridge). Change the water about every 2 months, or sooner when it will not stay clear. Keep the acrylic glossy with non-abrasive cleaners and rinse away all soap so it does not foam on refill. In freezing weather keep the power on and set a warmer temperature; for a long shutdown drain the tub and the heat pump completely.
Resources
Shipping, Returns & Warranty
KPlunge ships this item from the SW Corp warehouse by LTL freight with curbside delivery: the carrier contacts you to schedule the delivery, and you move the item from the curb to its final spot. Orders usually leave the warehouse within 1 to 2 business days, and you'll get tracking by email as soon as it ships. Shipping is free within the lower 48 states; for Alaska or Hawaii, contact us before you order.
Inspect the packaging and the product before you sign. Note any damage or shortage on the delivery receipt, then email photos to support@mycleansupplies.com within 48 hours of delivery so the freight claim can be filed. Damage reported after 48 hours can't be claimed.
Unused KPlunge products in their original packaging can be returned within 21 days of delivery. Ask us for a return authorization before you ship. You pay the return shipping, which for a freight item means the freight cost, and a 20% restocking fee is deducted along with payment processing fees. Installed, used or damaged products and special-order items can't be returned.
SaunaSpa warrants this cold plunge against defects in materials and workmanship under normal use for 1 year from the original date of purchase. Register it at saunaspa.com/register within 90 days of delivery; the warranty is void without registration. Follow all installation and operating instructions, use the product only as intended and keep your proof of purchase. Improper installation, misuse, abuse or neglect, unauthorized repairs or modifications, and failure to follow the maintenance instructions are not covered.
Warranty claims. Call SW Corp, the maker of KPlunge, at 866-588-8008 with your proof of purchase, the model number and a description of the problem. Register the product at saunaspa.com/register within 90 days of delivery. Contact us with your order number if you would like help with the claim.
About KPlunge
KPlunge makes cold plunge tubs, all-in-one chiller tubs, inflatable plunges and plunge chillers for home recovery. It is part of SW Corp in Miami, Florida, alongside SaunaSpa, SteamSpa, ANZZI and MediTub.
KPlunge all-in-one plunges build the chiller, heater, controls and filtration into the tub: the 84-gallon Iroquois (CP-CH6732N) in white acrylic with a chestnut finish and a single circulating jet, and the larger Borealis (CP-CH7939) in blue (CP-CH7939BL) or white (CP-CH7939WH) with two jets and Bluetooth speakers. Buyers who prefer a separate chiller can pair the KPlunge cedar or inflatable tubs with the Gale 3/4 HP or 1 HP unit.
