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Chillers
Chill Core 300
Entry chiller for tubs up to 350L, 3–15°C range
Every health claim on this site links to the peer-reviewed study behind it
One-time purchase
£599.00
or 4 interest-free payments of £149.75 with Klarna
In stock
- Free UK & EU delivery over £100, typically 5–10 working days
- Full refund on unused items returned within 30 days of delivery
- 30-day returns
- Ships from UK & EU warehouses - no customs charges
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- Klarna
- 30-day returns
- Free UK & EU delivery over £100
- Full refund on unused items
±0.5°C
Holds your set temperature through repeat sessions
3–15°C
Full cold-plunge temperature range
~40 min
Built-in filtration cycles the full tub volume
≤65dB
Quiet enough for a bedroom or home gym
- Titanium heat exchanger resists chlorine and salt-water corrosion
- 2-year warranty
Why it works
About this product
The Chill Core 300 turns any Kaldera tub into a set-and-forget cold plunge. It holds temperature within ±0.5°C across a 3–15°C range, so you set your target once and it maintains it through repeat sessions.
Inside is a titanium heat exchanger, which resists corrosion from chlorine or salt water treatments far better than the copper coils used in cheaper units. The built-in filtration pump cycles the full tub volume roughly every 40 minutes, keeping water clear between water changes.
Rated for tubs up to 350L, which covers the Plunge 320 and 80 comfortably. Runs at 65dB or below - quiet enough for a bedroom or home gym.
Specifications
- Temp Range (C)
- 3–15
- Power (W)
- 780
- Max Tub (L)
- 350
- Heat Exchanger
- titanium
- Noise (dB)
- 65
What to expect
Your first weeks, mapped out
- Order
We dispatch from our UK and EU warehouses and email you a tracking number as soon as your order leaves the warehouse.
- Delivery
Typical transit is 5–10 working days, free tracked delivery on this order - no customs charges within the UK or EU.
- Setup
Connect it to your tub, set your target temperature once, and it holds it within ±0.5°C while the built-in filtration cycles the water.
- Daily routine
A chiller is what makes a daily routine sustainable - the water stays at your set temperature day after day, no ice runs.
Common questions
Everything you need to know
Which tubs does it work with?
The Chill Core 300 is rated for tubs up to 350L, which covers the Plunge 320 and Plunge 80 comfortably. For the 550 XL, step up to the Chill Core 500 or Pro.
How cold does it get, and does it hold the temperature?
It holds temperature within ±0.5°C across a 3–15°C range - you set your target once and it maintains it through repeat sessions, turning any Kaldera tub into a set-and-forget cold plunge.
Is it too loud for indoor use?
It runs at 65dB or below - quiet enough for a bedroom or home gym.
Does it keep the water clean too?
The built-in filtration pump cycles the full tub volume roughly every 40 minutes, keeping water clear between water changes.
Can I use water treatment chemicals with it?
Yes, the titanium heat exchanger resists corrosion from chlorine or salt water treatments far better than the copper coils used in cheaper units.
How long does delivery take?
Typical transit is 5–10 working days from our UK and EU warehouses, with free tracked delivery on this order (free on all orders over £100) and a tracking number emailed at dispatch.
What warranty does it carry?
Our chillers carry a 2-year warranty. If it arrives faulty or fails within that period, contact us and we'll arrange a free repair, replacement or refund. Standard 30-day returns apply on top.
30-day returns
Full refund on unused items returned within 30 days of delivery
Read the full returns policyCustomer reviews
Reviews
Sam Whitcombe
Quiet, holds 4°C rock steady, and the titanium coil gives me peace of mind since I run treatment drops through the water regularly.
Anna Kowalczyk
Does exactly what it says. Takes a while to pull down from a warm summer fill, but once it's there it stays there.
Ben Okonkwo
Paired with the Plunge 320 and it's been completely maintenance-free for two months. Filtration keeps the water genuinely clear.
