Modern Reform Kooru Cold Plunge Tub | Handcrafted Redwood, 1/4 HP Chiller & Ozone Water Treatment

Modern Reform Kooru Cold Plunge Tub – Handcrafted Redwood Cold Water Immersion

Bring the character of artisan craftsmanship into your home wellness space with the Modern Reform Kooru Cold Plunge Tub. Handcrafted in San Diego using carefully selected redwood, the Kooru combines a distinctive wood exterior with an integrated water-cooling and treatment system. Each tub is individually finished using the Japanese-inspired Shou Sugi Ban technique, creating rich wood tones and visible grain that make it an attractive centerpiece for a dedicated cold plunge area.

The Kooru Cold Plunge Tub is designed to make cold water immersion a convenient part of your personal routine. Its built-in 1/4 HP chiller, adjustable temperature control, and ozone water treatment system provide a practical alternative to manually preparing an ice bath for each session. With approximately 60 gallons of water capacity and a high-density polyurethane interior compartment, the Kooru brings together traditional woodworking and modern water-management equipment.

Designed for straightforward ownership, the tub arrives assembled, operates using a standard 110V electrical supply, and incorporates a filtration system with manufacturer-recommended filter replacement approximately every one to two months. Available in five listed finish options, the Kooru offers a balance of visual craftsmanship, functional cooling, and everyday convenience for those creating a thoughtfully designed home cold plunge space.

Key Features

• Handcrafted in San Diego: Individually constructed by Modern Reform with attention to wood selection and finishing.

• Selected Redwood Exterior: Natural wood construction creates a distinctive appearance.

• Shou Sugi Ban Wood Finish: A traditional Japanese-inspired charring technique enhances the visible grain and depth of the wood finish.

• Integrated 1/4 HP Chiller: Provides powered water cooling with adjustable temperature control.

• 950 GPH Pump: Manufacturer-listed water circulation pump capacity.

• Ozone Water Treatment: Built-in ozonator forms part of the water sanitation system.

• Approximately 60-Gallon Water Capacity: Supports individual cold water immersion.

• High-Density Polyurethane Interior: A separate molded tub compartment holds the water.

• Adjustable Water Level: Fill depth can be adjusted according to user preference and water displacement.

• 110V Electrical Operation: Designed for connection to an appropriately protected household electrical outlet.

• Typical 350–500W Power Consumption: Manufacturer-listed operating power range.

• Five Finish Options: Natural, Oiled Leather, Spanish Oak, Dark Natural, and Teak.

• Arrives Assembled: The manufacturer describes the tub as arriving fully set up.

• Replaceable Filter: Manufacturer-recommended replacement interval of approximately one to two months, depending on usage.

Product Specifications

Specification	Details
Brand	Modern Reform
Product Name	Kooru Cold Plunge Tub
Product Type	Cold Water Immersion Tub
Exterior Wood	Selected Redwood
Wood Finishing Technique	Shou Sugi Ban
Interior Tub Material	High-Density Polyurethane
Exterior Dimensions	Approx. 64 × 34 × 35 in
Interior Tub Compartment	36 × 24 × 30 in
Approximate Product Weight	400 lb
Water Capacity	Approx. 60 Gallons
Chiller	1/4 HP
Pump Flow Rating	950 GPH
Temperature Control	Adjustable
Water Treatment	Ozone / Ozonator (O₃)
Filtration	Replaceable Filter
Suggested Filter Replacement	Every 1–2 Months, Depending on Use
Electrical Supply	110V
Typical Power Consumption	350–500W
Manufacturer-Listed Current	3–5A
Minimum Passage Clearance	At Least 33 in
Assembly	Arrives Assembled
Manufacturing Location	San Diego, California
Available Finish Options	Natural, Oiled Leather, Spanish Oak, Dark Natural, Teak

Dimensions are approximate. Due to the handcrafted construction, the manufacturer notes possible variations of up to ¼ inch in length and width.

Handcrafted Redwood Construction

Individually Crafted in San Diego

Modern Reform describes each Kooru tub as individually handcrafted in San Diego, California.

Carefully Selected Redwood

The exterior is constructed using selected redwood boards, creating a natural appearance with visible grain patterns.

Artisan Woodworking

The manufacturer emphasizes hand selection, firing, and sanding during production.

Distinctive Wood Character

Because wood grain and handcrafted finishes vary, each tub may have subtle visual differences.

A Statement for Home Wellness Spaces

The natural materials and finished wood exterior make the Kooru suitable for a thoughtfully designed cold plunge environment.

Shou Sugi Ban Wood Finishing

Traditional Japanese-Inspired Technique

Shou Sugi Ban is a wood-finishing method that involves charring the surface of the wood.

Rich Color and Grain

Modern Reform uses this technique to create depth of color and emphasize the natural grain.

Individually Finished Boards

The manufacturer describes carefully firing and sanding the selected boards.

Distinctive Appearance

The resulting finish provides visual texture suited to both contemporary and rustic interiors.

Handcrafted Variations

Natural differences in wood and finishing are part of the product's handcrafted character.

Integrated 1/4 HP Water Chiller

Built-In Cooling Equipment

The Kooru includes a manufacturer-listed 1/4 horsepower chiller.

Adjustable Temperature Control

The system allows users to adjust the water temperature according to their preferred cold plunge routine.

Convenient Preparation

Powered cooling reduces the need to manually add ice for each session when the chiller is operating within its intended conditions.

Integrated Water Circulation

The chiller works alongside the tub's water circulation equipment.

Temperature Specifications

The current product listing does not provide a verified minimum water temperature, cooling time, or ambient-temperature performance rating. These details should be confirmed before purchase if a specific temperature target is important.

950 GPH Water Circulation Pump

Manufacturer-Listed Pump Rating

The Kooru features a pump rated at 950 gallons per hour.

Water Circulation

The pump circulates water through the system as part of the tub's cooling and treatment operation.

Integrated System

The circulation pump is part of the Kooru's built-in water-management equipment.

Routine Maintenance

Follow the manufacturer's instructions for maintaining the pump, filters, and associated water connections.

The 950 GPH figure is the manufacturer's stated pump rating, not a guarantee of actual flow under every operating condition.

Ozone Water Treatment System

Integrated Ozonator

The Kooru includes an ozonator that generates ozone (O₃) for water treatment.

Part of the Water-Management System

Ozone is used as an oxidizing agent in the tub's sanitation process.

Designed for Ongoing Use

The treatment system complements the circulation and filtration equipment.

Follow Water-Care Instructions

Maintain water quality according to the manufacturer's procedures, including testing, filter changes, and any required additional treatment.

Important Water-Safety Consideration

An ozonator does not automatically guarantee sterile water or eliminate the need for proper sanitation practices. Follow the manufacturer's operating guidance and avoid exposure to ozone gas.

Approximately 60-Gallon Water Capacity

Designed for Individual Immersion

The Kooru holds approximately 60 gallons of water, depending on fill level and displacement.

Adjustable Fill Height

Water level can be adjusted according to personal preference.

Immersion Depth

The manufacturer describes the ability to fill the tub for immersion reaching toward the shoulders or neck, depending on the occupant's body dimensions and water displacement.

Practical Water Management

A published capacity helps with planning filling, draining, and routine water care.

High-Density Polyurethane Interior

The water-holding compartment is made from high-density polyurethane.

Dimensions and Space Planning

Measurement	Specification
Exterior Length	Approx. 64 in
Exterior Width	Approx. 34 in
Exterior Height	Approx. 35 in
Interior Tub Length	36 in
Interior Tub Width	24 in
Interior Tub Height	30 in
Approximate Weight	400 lb
Water Capacity	Approx. 60 gal
Minimum Passage Clearance	At Least 33 in

Compact Immersion Compartment

The interior water compartment measures 36 × 24 × 30 inches.

Measure the Delivery Route

The manufacturer specifies at least 33 inches of clearance through doorways and passages.

Account for Handcrafted Variations

Exterior length and width may vary by up to approximately ¼ inch.

Plan for Filled Weight

Water adds substantial weight. Approximately 60 US gallons of water weighs about 500 pounds, bringing the tub and water to roughly 900 pounds before accounting for the occupant or accessories.

Verify Floor Support

Confirm that the intended installation surface can support the combined weight of the tub, water, and user.

Electrical Requirements

Electrical Specification	Published Value
Operating Voltage	110V
Typical Power Consumption	350–500W
Manufacturer-Listed Current	3–5A
Outlet Requirement	Grounded or GFCI-Protected, as Applicable

Standard Household Voltage

The manufacturer describes the Kooru as operating on a regular 110V household electrical supply.

Typical Operating Consumption

The product listing states typical power use of 350–500 watts.

Ground-Fault Protection

Use a properly installed, grounded and GFCI-protected connection as required by the manufacturer's instructions and applicable electrical codes.

Electrical Safety Near Water

Keep electrical components and connections protected from water exposure. Do not use extension cords or adapters unless expressly permitted by the manufacturer.

Confirm Installation Requirements

Have a qualified electrician verify the suitability of the intended outlet and circuit if necessary.

Available Wood Finish Options

The Kooru is listed in five finish selections.

Finish Option	Listed Availability
Natural	Yes
Oiled Leather	Yes
Spanish Oak	Yes
Dark Natural	Yes
Teak	Yes

Personalized Appearance

Choose a listed finish that complements your wellness space.

Handcrafted Wood Character

The natural grain and hand-finished surfaces may vary between individual tubs.

Finish Naming

These names refer to the product's listed finish options. They should not be interpreted as confirming additional wood species or upholstery materials.

Assembly, Delivery and Production

Arrives Assembled

Modern Reform describes the Kooru as arriving fully set up.

Handcrafted Production

The product listing provides an approximate production estimate of two weeks.

Shipping Estimate

The manufacturer also describes shipping as taking approximately another two weeks, depending on location.

Delivery Times May Vary

Production and transit estimates are not guaranteed delivery dates and should be confirmed at the time of purchase.

Plan for the Tub's Weight

At approximately 400 pounds empty, the tub requires appropriate handling equipment and assistance.

Confirm Access Before Ordering

Ensure that the intended delivery route meets the manufacturer's minimum 33-inch passage clearance.

Care and Maintenance

Replace the Water Filter

The manufacturer recommends filter replacement approximately every one to two months, depending on usage.

Monitor Water Quality

Follow the manufacturer's water-testing and treatment instructions.

Maintain the Ozonator

Inspect and service the ozone treatment equipment according to the manufacturer's guidance.

Check the Chiller and Pump

Follow recommended maintenance procedures for cooling and circulation components.

Clean the Interior Tub

Use cleaning products approved for the high-density polyurethane interior.

Protect the Wood Exterior

Follow Modern Reform's care instructions for the Shou Sugi Ban finish and avoid unapproved cleaners or coatings.

Drain and Refill as Directed

Maintain water cleanliness using the manufacturer's recommended draining and refill schedule.

Use Cold Water Responsibly

Cold water immersion can place significant stress on the cardiovascular system. Enter gradually, avoid plunging alone, and stop immediately if you experience dizziness, chest discomfort, or unusual breathing difficulty. Consult a healthcare professional before use if you have cardiovascular concerns or other conditions affecting cold tolerance.

Frequently Asked Questions

Who makes the Kooru Cold Plunge Tub?

The Kooru is made by Modern Reform, which describes its tubs as handcrafted in San Diego, California.

What is the exterior made from?

The Kooru uses selected redwood with a Shou Sugi Ban wood finish.

What is Shou Sugi Ban?

Shou Sugi Ban is a traditional Japanese-inspired wood-finishing technique that chars the wood surface to create distinctive color and grain characteristics.

Does the Kooru include a chiller?

Yes. The product listing specifies a 1/4 HP chiller with adjustable temperature control.

How cold can the Kooru get?

The current listing does not specify a verified minimum water temperature. Contact the manufacturer for the exact cooling range and performance conditions.

How much water does the tub hold?

The Kooru holds approximately 60 gallons, depending on fill level and water displacement.

Does it include water filtration?

Yes. The tub includes a replaceable filter, with manufacturer-recommended replacement approximately every one to two months depending on use.

Does the Kooru have ozone sanitation?

Yes. The integrated ozonator is part of the tub's water-treatment system.

What are the exterior dimensions?

Approximately 64 inches long, 34 inches wide, and 35 inches high.

What are the interior dimensions?

The water-holding compartment measures approximately 36 × 24 × 30 inches.

How much does the Kooru weigh?

The manufacturer lists an approximate empty weight of 400 pounds.

Does the tub require a special electrical connection?

The manufacturer states that the Kooru operates on a regular 110V household electrical supply, with typical consumption of 350–500W. The outlet must meet applicable grounding and GFCI safety requirements.

Does the Kooru arrive assembled?

Yes. Modern Reform describes the tub as arriving fully set up.

What finishes are available?

The listed options are Natural, Oiled Leather, Spanish Oak, Dark Natural, and Teak.

How long does production and shipping take?

The product listing estimates approximately two weeks for production and another two weeks for shipping, depending on location. These are estimates rather than guaranteed delivery dates.

Is the Kooru suitable for indoor or outdoor use?

The current listing does not explicitly specify approved indoor or outdoor installation conditions. Confirm placement, weather protection, drainage, and electrical requirements with the manufacturer before installation.

What warranty is included?

The current product listing does not specify warranty coverage or duration. Confirm the applicable manufacturer warranty terms before purchase.