The TUNDRA Inari two person oval cold plunge, three quarter view, black stainless steel interior and WPC oak woodgrain cladding
The Inari System on a covered timber deck beside a tropical garden, with the hoses running behind the tub to the Borealis chiller
The Inari System: the Inari oval plunge beside the Borealis Gen 5 heater and chiller
The Inari System with the folding cover on, beside the Borealis Gen 5 heater and chiller
The Inari with its folding cover on, connected to the Borealis chiller on a high-rise terrace in Singapore at dusk
The Inari System: Inari plunge connected to the Borealis Gen 5 heater and chiller
Back of the Inari System: the three connections on the back of the tub, the two circulation hoses to the Borealis Gen 5 and the drain valve
The TUNDRA Inari two person oval cold plunge, front view, WPC oak woodgrain cladding with two black bands
The TUNDRA Inari two person oval cold plunge with its insulated cover on, folding at the centre, with a handle on each half
The Inari seen from above: the 1,540 by 1,070 mm oval opening, black stainless steel interior and the connections on the centre of the back
The Inari with the folding cover on, seen from above, showing the centre fold
The Inari System seen from above: the oval plunge beside the Borealis Gen 5
The Inari System with the folding cover on, seen from above
The Borealis Gen 5 heater and chiller beside the Inari plunge
Close up of the TUNDRA wordmark engraved in the black band on the Inari WPC cladding
Tundra Ice Bath

The Inari System

Sale price$5,290.00 SGD

A two person oval cold plunge, 1,540 by 1,070 mm, with a black electroplated stainless steel interior and WPC cladding. Paired with the Borealis™ Gen 5 heater and chiller, it holds any temperature from 3 °C to 42 °C.

  • Two adults sit facing each other, about 590 L of water
  • 3 °C to 42 °C, held around the clock, no ice
  • WPC cladding that needs no oiling or sealing in tropical weather
  • Ozone and 20 micron filtration with continuous circulation
  • Delivered and set up by our own team in Singapore

Pro or Elite? On a first fill from tropical ambient to 5 °C, the Elite takes about four hours and the Pro about eight. Once the water is at temperature, both hold it in energy saving mode.

New to cold plunging or comparing setups? Read the Ice Bath and Cold Plunge Buyer's Guide

Care and maintenance: your system runs on the Borealis™ Gen 5. See the Care, Maintenance and User Guide

Borealis™ (Select Your Engine): Tub only (no engine)

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

Serviced by us, in Singapore, for the life of the product.

Made to order. We confirm your delivery date when you order.

The Inari System

The Inari is the largest plunge we build: an oval 1,540 mm long and 1,070 mm wide. Two adults sit facing each other with their shoulders under water, or one person lies back with legs extended.

Built for tropical weather. The cladding is WPC with an oak woodgrain finish. Natural timber greys, swells and splits in year round heat, rain and humidity; WPC holds its colour and shape and never needs oiling or sealing. The interior is seamless electroplated stainless steel in black.

Any temperature, every day. The Borealis™ Gen 5 cools to 3 °C, heats to 42 °C and holds the set temperature around the clock, with continuous 20 micron filtration and ozone. No ice to buy, nothing to top up.

Set up in an afternoon. Place the tub, connect two hoses, fill it and plug the Borealis™ into a standard socket. No plumbing, no electrician. In Singapore our own team delivers and sets it up.

How it compares. Tavik: round, 860 mm across, one person seated upright, about 380 L. Taiga: one person lying down, chiller built in. Inari: oval, two people seated or one lying back, about 590 L, with a separate Borealis™ Gen 5.

In the price. The tub and insulated hard cover, the Borealis™ Gen 5 you select, both circulation hoses, a 10 m utility hose, three filter cartridges, the drainage system and the essentials kit.

Why TUNDRA. TUNDRA is a Singapore company. We specify our plunges and saunas for tropical conditions, and deliver, set up and service them with our own team.

Key Benefits

Heating and Cooling, 3 °C to 42 °C

The Borealis™ Gen 5 cools to 3 °C and heats to 42 °C, and holds the set temperature around the clock without ice.

The Inari seen from above: the 1,540 by 1,070 mm oval opening, black stainless steel interior and the connections on the centre of the back

Built for Two

An oval 1,540 mm long and 1,070 mm wide. Two adults sit facing each other, or one person lies back with legs extended. About 590 L.

Close up of the TUNDRA wordmark engraved in the black band on the Inari WPC cladding

Materials That Hold Up Here

WPC cladding in oak woodgrain holds its colour and shape through heat, rain and humidity, with no oiling or sealing. Black electroplated stainless steel interior.

Ozone and 20 Micron Filtration

Continuous circulation through a 20 micron cartridge filter, with an ozone generator that helps keep the water clean between changes.

Touch Panel, Wi-Fi and App

Set temperature, modes and schedules on the Borealis™ touch panel or in the Smart Life app.

The TUNDRA Inari two person oval cold plunge with its insulated cover on, folding at the centre, with a handle on each half

Insulated Hard Cover

Insulated walls and a strapped hard cover keep the cold in, reduce energy use and keep leaves and rain out.

Two people sitting facing each other in the Inari on a garden deck, portrait

The largest plunge we build, shaped so two people can sit in it properly.

A Plunge You Can Share.

Everything you need for immediate setup.

What's Included

  • Inari two person tub, dual wall insulated
  • Insulated hard cover with straps
  • 10 m utility hose with quick connector, for filling and draining
  • Drainage system

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.

Shared ritual

Two people in the water at once makes it a habit you keep together.

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. 1. Machado AF et al. Sports Medicine, 2016. Meta-analysis of 9 randomised trials, 169 participants.
  2. 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 Inari Tub:
L x W x H: 154 x 107 x 70 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

Approx. 590 L at the normal fill level

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

Based on approx. 590 L.

Gen 5: Pro (1.0HP)
Cooling: ~3.0-3.5°C per hour
Heating: ~4.6-5.7°C per hour

Gen 5: Elite (2.0HP)
Cooling: ~6.3-7.6°C per hour
Heating: ~7.6-8.9°C per hour

About these values

The Inari holds roughly 590 L, which is a large volume for a plunge. On a first fill from tropical ambient down to 5°C, the Elite gets there in about four hours and the Pro in about eight. Once the water is at temperature both engines hold it easily in energy saving mode, so this difference matters most on the first fill and after a water change.

Figures are realistic estimates for continuous operation under typical conditions. Actual performance varies with ambient temperature, sun exposure, wind, use of the cover, plumbing length, circulation rate, and heat introduced by users.

Technical guide

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

Issue A, 13 October 2026. 27 pages. PDF, 5 MB.

Dimensions, water volume and floor loading, space and site planning, delivery and access, connections and full technical data for the Pro and Elite chillers. Then safety, installation, touch panel and app, everyday use, care, draining, troubleshooting and warranty.

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

The Inari System on a covered timber deck beside a tropical garden, with the hoses running behind the tub to the Borealis chiller
The black rim of the Inari and the engraved TUNDRA wordmark on the upper band in morning light
The Inari with its folding cover on, connected to the Borealis chiller on a high-rise terrace in Singapore at dusk

FAQ

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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