The Lena System

$5,339.00 SGD

A space-saving inflatable cold plunge in a refined barrel shape paired with the Borealis™ Heater & Chiller. Durable, portable, and designed for daily cold therapy at home or outdoors.

New to cold plunging or comparing setups? Read the Ice Bath & Cold Plunge Buyer’s Guide →

Care & maintenance: Your system runs on the Borealis™ Gen 5. See the full Care, Maintenance & User Guide →

Borealis™ (Select Your Engine): Gen 5: Pro (1.0HP)

Gen 5: Pro (1.0HP) Gen 5: Elite (2.0HP) Tub only (no engine)

Size Chart

LENA Size Chart

Size	Length (cm)	Width (cm)	Height (cm)	Dimensions (L x W x H)
One Size	90	90	75	90 x 90 x 75 cm

Cover Thickness

10 cm

All dimensions are approximate and may vary slightly due to manufacturing tolerances.

Tub: GEN 2 vs. GEN 3: What's the difference?

Gen 3
Our latest-generation design in dark grey. A fully re-engineered tub with a reinforced heavy-duty shell, optimized Smart-Flow circulation for faster cooling, and storm-ready straps for secure outdoor use. Built for long-term performance and everyday setups.

Quantity:

Delivered, installed and commissioned by our own team. Included for mainland Singapore.

Serviced by us, in Singapore, for the life of the product. We also deliver worldwide, with delivery included in the price. Delivery times by country

In stock

The Lena System barrel hot and cold plunge, TUNDRA Singapore

Tundra Ice Bath The Lena System

$5,339.00 SGD

The Lena System

The LENA Gen 3 System combines our most accessible tub design with the raw power of our Smart Chiller. By pairing the re-engineered LENA tub with our dual-action thermal engine, we have created a recovery station that is easier to use, faster to cool, and built to last.

Key System Benefits:

Optimized Flow & Filtration: We re-engineered the LENA Gen 3’s water inlet to maximize the efficiency of the Chiller. This upgraded "Smart Flow" design ensures water circulates rapidly through the chiller’s 20-micron filter and Ozone sterilization system, delivering clearer water and faster cooling times than ever before.

Total Climate Control (3°C – 42°C): Take command of your recovery. Our high-performance chiller (0.8HP – 2.0HP) allows you to switch between icy cold plunges and hot therapy sessions in minutes. With WiFi connectivity, you can set your temperature and schedule sessions directly from your phone via the Smart Life App.

Accessible & Reinforced Design: The LENA Gen 3 features a reduced height profile for effortless entry and exit, making your daily plunge smoother. Despite the lower profile, the structure is reinforced with heavy-duty materials and upgraded security straps, ensuring it stays rigid and secure in rugged outdoor conditions.

Plug-and-Play Simplicity: Designed for seamless integration. The system connects instantly with industrial quick-connect hoses. Whether you are setting up on a gym floor or a backyard patio, the LENA System is ready to run without tools or plumbing.

Key Benefits

Heating & Cooling

Delivers precise cooling down to 3°C and heating up to 42°C with the integrated Borealis™ system.

Stronger, Reinforced Drop-Stitch Walls

The new military-grade multi-layer drop-stitch fabric gives the Lena a firmer, more rigid feel, improving stability and long-term durability indoors and outdoors.

Clear, ozone-sanitised water inside a stainless steel plunge

Advanced Ozone Sterilization

Commercial grade Ozone sanitation system keeps water clean and sanitised for safe and hygienic use.

Efficient Filtration

Features a 20-Micron filter cartridge system for clean, clear water and reduced maintenance.

Touch Panel with Wi-Fi and Smart App Control

Adjust temperature, modes, and schedules seamlessly through the Smart Life app.

Space-Saving Footprint

The squared barrel shape maximizes water depth while minimizing floor space, making it the perfect solution for balconies, smaller patios, or tight indoor areas.

LENA Gen 3 is redesigned with a lower profile, smarter flow, and reinforced build for your most powerful plunge yet.

The Evolution of Cold.

Delivery & Installation

Delivery & Setup: Fast & Flexible

Experience the TUNDRA difference in record time. Our inflatable series is designed for portability and speed, perfect for getting your cold therapy started immediately.

Global Delivery Timelines

We handle all logistics to get you plunging as fast as possible.

Singapore (Local): 1–2 Days
In-stock units ship immediately.
APAC: 14–18 days
Europe and the UK: 30–40 days (Ocean Freight)
USA and Canada: 30–45 days (Ocean Freight)

Note: For all orders, our delivery partner will contact you directly to confirm access details and schedule your specific drop-off time.

Installation: Set Up in 15 Minutes

Your system arrives in compact, portable boxes. No tools required, everything you need is included.

Inflate the tub using the provided hand pump (approx. 1-2 minutes).
Connect the Chiller to the Tub using the two provided hoses.
Fill the tub with water using the included 10m hose.
Plug the Chiller into a standard power socket, set your temperature, and plunge.

Delivered worldwide. Delivery to your door is included in the price in every country we ship to. Hong Kong, Asia Pacific and the Middle East: 14 to 18 days. Europe and the UK: 30 to 40 days by sea. USA and Canada: 30 to 45 days by sea. Rest of the world: 30 to 50 days. We ship duties paid (DDP) wherever our freight partners can. Where import duties or taxes are payable on arrival, we confirm the amount with you in writing before your order ships. Outside Singapore and Hong Kong, installation is not included. Delivery times by country: tundra.health/pages/shipping.

Maintenance & Support

Water Care

• Add mild sanitizers (non-chlorine, non-bromine) to keep the water clean for several weeks
• Clean the skimmer basket weekly to remove leaves, hair, and debris
• Replace the filter cartridge every 3–4 weeks depending on usage
• Change the water every 3-4 weeks for optimal hygiene, depending on hygiene and frequency of use

General Maintenance

• Wipe the tub occasionally to remove body oils or sunscreen residue
• Ensure there is good airflow around the Borealis™ unit
• Avoid using extension cables

Support

• All units include 1-year warranty
• Local in-house support team available in Singapore; in other markets we work with trusted partners and service providers

For more details please check: Installation, Maintenance & Support

Return to Yourself

How it feels

Wide awake

A rush of alertness within seconds of getting in.

Clear head

A calm, focused feeling once you step out.

Lighter legs

Tired muscles feel fresher after hard training.

Built resilience

Each plunge is a small win that carries into the day.

What the research says

9

Randomised trials in a meta-analysis that found cold water immersion after exercise reduced muscle soreness compared with passive rest.¹

11-15 °C

Water temperature that gave the best soreness results in these trials, with 11 to 15 minutes in the water.¹

5 min

In 20 °C water raised positive mood scores in a study of 33 adults.²

1. Machado AF et al. Sports Medicine, 2016. Meta-analysis of 9 randomised trials, 169 participants.
2. Yankouskaya A et al. Biology, 2023. 33 adults.

How it feels describes experiences people commonly report. These are personal experiences, not scientifically established effects, and they vary from person to person.

TUNDRA products are wellness equipment, not medical devices. If you are pregnant or have a heart, circulatory or other medical condition, speak to your doctor first. Full references on our science page.

Product specification

Dimensions

The Lena Tub:
- Gen 3: LxWxH: 90 x 90 x 75 cm
- Cover thickness: 10 cm

Borealis™ Heater & Chiller:
- Gen 5: Pro (1.0HP): W x D x H: 62.9 x 39.4 x 60.3 cm
- Gen 5: Elite (2.0HP): W x D x H: 67.7 x 42.3 x 62.6 cm

Water Capacity

Gen 3: 300 L;

Temperature Range

3°C to 42°C (Cooling + Heating)

Compressor / Heater & Chiller:

Gen 5: Pro (1.0HP):
- Compressor power: 900 W
- Cooling capacity: 2,450 W
- Heating capacity: 3,800 W
- Refrigerant: R410A (360 g)

Gen 5: Elite (2.0HP):
- Compressor power: 1,660 W
- Cooling capacity: 5,000 W
- Heating capacity: 5,800 W
- Refrigerant: R410A (480 g)

Cooling/Heating Performance

Gen 5: Pro (1.0HP)
Cooling: ~6-7°C per hour
Heating: ~9-11°C per hour

Gen 5: Elite (2.0HP)
Cooling: ~13-15°C per hour
Heating: ~15-17°C per hour

About these values:

These figures are realistic estimates for a 300 L tub running continuously under typical conditions. Actual cooling and heating performance may vary depending on ambient temperature, sun exposure, wind, insulation quality, use of a cover, plumbing length, circulation rate, and heat introduced by users.

Technical guide

Lena System: technical data, planning and owner's guide

Issue C, 3 October 2026. 31 pages. PDF, 5.3 MB.

Dimensions, space and site planning, delivery and packing, connections and full technical data for the Pro and Elite chiller variants. Then safety, set-up and first start, inflating with the hand pump and the air valve, touch panel and app, care, draining, deflating and storage, troubleshooting and warranty.

For architects, interior designers and installers. Verify all dimensions on site.

FAQ

Can I use it indoors and outdoors?

Yes, it’s fully outdoor-ready. The tub is made from weatherproof materials, and the included cover helps keep the water insulated and protected from dirt and debris.

Do you ship overseas?

Yes. We deliver worldwide from Singapore, and delivery to your door is included in the price shown for your country. We ship duties paid (DDP) wherever our freight partners can. Where import duties or taxes are payable on arrival, we confirm the amount with you in writing before your order ships. Delivery times by country are on tundra.health/pages/shipping.

How long does delivery take?

Global Delivery Timelines

We handle all logistics, customs clearance, and freight coordination. Timelines vary by region:

Singapore:
1–2 days.
APAC: 14–18 days
Typically faster due to proximity to our manufacturing hub.
Europe and the UK: 30–40 days
Shipped via ocean freight. Air freight (5–9 days) is available upon request for an additional fee.
USA and Canada: 30–45 days
Standard ocean freight to your doorstep. Timeline depends on coast (West vs. East) and customs processing.

Note: Our team will personally contact you to confirm access details and schedule your specific delivery window once the unit clears customs.

Delivered worldwide. Delivery to your door is included in the price in every country we ship to. Hong Kong, Asia Pacific and the Middle East: 14 to 18 days. Europe and the UK: 30 to 40 days by sea. USA and Canada: 30 to 45 days by sea. Rest of the world: 30 to 50 days. We ship duties paid (DDP) wherever our freight partners can. Where import duties or taxes are payable on arrival, we confirm the amount with you in writing before your order ships. Outside Singapore and Hong Kong, installation is not included. Delivery times by country: tundra.health/pages/shipping.

Does it require professional installation?

No professional installation is required. Simply place it on a flat surface, inflate it, and connect it to your Borealis™ heater and chiller using the provided hoses. Once connected, fill it with water and set your desired temperature.

What if I didn't book a setup service?

If setup service is not booked, delivery is to the doorstep only.

Bringing the unit into position may require 1-2 people due to the weight and size, but the actual setup and installation are very simple — place the unit and inflate it with the provided pump, connect the included drainage valve, fill it, and plug it in.

Please note that setup services are not available in every country.

To check availability in your area, please contact support@tundra.health.

What power outlet do I need?

• Most markets (EU, SG, AU, UK): 220–240V

• North America & Japan: 100–127V

Your unit will be shipped with the correct voltage and plug type for your country.
Simply plug it into a normal household outlet – no special wiring required

Should I keep the unit running all the time?

Yes, we recommend keeping it running.

Circulation, filtration, and sanitation are only active while the Borealis™ system is operating. Once the water reaches your set temperature, the system automatically switches into energy-saving mode and maintains the temperature with minimal power consumption.

How much does it weigh when filled?

Gen 3: Tub weight: 15 KG, Water Capacity: 300 KG, Total Weight: 315 KG

Borealis™:
Gen 5 Pro (1.0HP): 38 KG
Gen 5 Elite (2.0HP): 40 KG

Our customer support is available Monday to Friday, 9am–6pm SGT and Saturday, 9am-12pm SGT.Average answer time: within 24h

Email us

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From product questions and services to bespoke projects and showroom visits, our team is ready to assist.
Share your enquiry below and we’ll help you find the right solution for your space, goals, and recovery routine.

The Lena System

LENA Size Chart

Key Benefits

Delivery & Setup: Fast & Flexible

Global Delivery Timelines

Installation: Set Up in 15 Minutes

Product specification

FAQ

Global Delivery Timelines

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