Rectangular rigid cold plunge tub with internal chiller unit
Illustrative image

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Renu Therapy

Cold Stoic 3.0

Bundle

The Cold Stoic 3.0 from Renu Therapy offers temperature control for cold and hot therapy, a dedicated chiller, dual-stage filtration with ozone, touchscreen and app controls including WiFi connectivity, and thick HD insulation. It features customizable tank and deck colors, and entry step with breath deck.

Tub structure
rigid
Chiller included
yes
Hot tub mode
yes

Description

The Cold Stoic 3.0 by Renu Therapy is engineered with a chiller for adjustable water temperatures supporting both cold plunging and hot therapy sessions. Its dual-stage filtration system, enhanced by ozone sanitation and a reusable external filter paired with a larger internal filter, maintains water clarity with minimal maintenance.

Controls are accessible via touchscreen or mobile app with WiFi for remote adjustments. The unit includes thick HD insulation for efficiency, customizable options across multiple tank and deck colors using composite and wood materials, an entry step, breath deck, and a standard lid with optional insulated spa cover upgrade.

You can choose from California Redwood, Pacific Cedar, Composite Antique Mahogany, Composite Brazilian Walnut, Composite Driftwood Grey or Composite Natural Teak for the deck, paired with base colors such as Meteorus Black, Estonian Sandstone, Adriatic Grey, Sira Grey Granite, Basalt Grey, or Bianco Romano Granite.

Specifications & features

Features

Chiller included Yes
Cover lid included Yes
Hot tub mode Yes
Suitable for outdoor use Yes
Active water circulation Yes

Temperature

Minimum set temperature (°F) 37 °F
Minimum set temperature (°C) 4 °C
Maximum heating temperature (°F) 104 °F
Maximum heating temperature (°C) 40 °C

Dimensions & weight

Tub outer dimensions LxWxH (inches) 70 x 33 x 35
Dry weight (lbs) 360 lbs
Tub outer width (inches) 33 inches
Tub outer height (inches) 35 inches
Tub outer width (mm) 838.20 mm
Tub outer height (mm) 889 mm
Dry weight (kg) 163.29 kg
Tub outer length (inches) 70 inches
Tub outer length (mm) 1778 mm
Tub outer dimensions LxWxH (mm) 1778 x 838.2 x 889
Tub internal dimensions LxWxH (inches) 40 x 25 x 31
Tub internal dimensions LxWxH (mm) 1016 x 635 x 787.4

Power & performance

Power (hp) 0.50 hp
Supports 110-120V / 60Hz Yes

Details sanitation

Ozone (O₃) sanitation Yes

General

Default warranty (years) 5 years
Chiller location Built-in
Chilling type Electric chiller
Tub structure type Rigid