What a cold plunge costs to run in the UK
The running cost of a cold plunge is almost entirely the chiller. Here is how to estimate it for your setup, and what makes the biggest difference.
The maths
A typical 1/3 HP to 1/2 HP home chiller draws 300 to 600 watts while running. How many hours a day it runs depends on tub insulation, whether a cover is used, ambient temperature and target temperature. Multiply watts by hours by your unit rate.
| Scenario | Chiller run time | Approx. monthly cost |
|---|---|---|
| Insulated tub, covered, garage or shaded, held at 5C | 2-4 hours a day | £10 to £20 |
| Insulated tub, covered, outdoors, held at 5C, summer | 4-6 hours a day | £20 to £35 |
| Uninsulated tub, no cover, outdoors, held at 5C, summer | 10+ hours a day | £50 to £90 |
| Any tub, UK winter, ambient below 8C | Under 1 hour a day | Under £10 |
Assumes a 450 W average draw and a unit rate around 25p per kWh. Your tariff will differ; the launch site includes a calculator that uses your own rate.
What moves the number
- A cover. The single cheapest improvement. An insulated lid can halve run time.
- Insulation. All-in-ones and insulated tubs cost more up front and less every month.
- Location. A garage or north-facing wall beats a sunny patio.
- Target temperature. 8C costs noticeably less than 3C in summer.
- Water changes. Good filtration means changing 300-500 L every 4-8 weeks rather than weekly. Water is cheap; the time is not.
Other costs
Filter cartridges (£10 to £30 every 1-3 months), sanitiser or minerals (a few pounds a month), and water. Budget £5 to £15 a month on top of electricity.
What Plungepedia covers
- Every cold plunge tub sold in the UK
- A separate chiller catalogue
- UK prices, tracked over time
- Running costs in pounds
- Brand pages: warranty, delivery, verdict
- Head-to-head comparisons
- Hands-on reviews with photos and video
Buying guides in preparation
- Best cold plunge UK 2026
- Best cold plunge chiller UK
- Tub plus chiller vs all-in-one
- Best cold plunge under £1,000
- Best cold plunge under £2,000
- Best inflatable cold plunge
- Amazon cold plunge tubs: which are worth it
- Cold plunging in a UK garden through winter
Manufacturers and retailers
If you sell cold plunge equipment in the UK and want your products listed, or have a question about how a product is described, email hello@plungepedia.com. Listing is free and does not depend on any commercial arrangement.