Key takeaways
- ✓A chiller draws about 1.2 kWh a day — roughly £10–25 a month at UK rates.
- ✓Bagged ice costs about £12 a session, so daily plunging hits £200–300 a month in summer.
- ✓Winter running costs are low; summer is when the chiller works hardest.
- ✓An insulated lid is the cheapest way to cut your bill.
- ✓Most daily plungers see a chiller pay back within about ten months.
Running cost is the question we get asked most, and the one almost no UK seller answers honestly. Most figures online are American, or guesses. So we did the simple thing: we put a plug-in energy meter on a chiller for a month and read the numbers. Here is what an ice bath actually costs to run in Britain.
What a chiller costs in electricity
Our 0.9HP Recovery Pro Chiller drew about 1.2 kWh a day over a month of daily use, holding a 400-litre tub at 3°C. At a typical UK rate of 27p per kWh that is about 32p a day — call it £10 a month in electricity. Add filters and the odd water change and the all-in figure lands at roughly £15–25 a month.
That number moves with the weather, because the chiller only works as hard as it needs to. On a hot week it runs more; in winter it barely runs at all.
What ice costs instead
If you skip the chiller and buy ice, each session needs about 10–15 kg. At supermarket prices that is roughly £12 a time. The monthly bill then depends entirely on how often you plunge.
| How often you plunge | On bagged ice | With a chiller |
|---|---|---|
| 2 a week | ~£100/mo | £15–25/mo |
| 4 a week | ~£190/mo | £15–25/mo |
| Daily (summer) | ~£300+/mo | £15–30/mo |
For your own figures, our running-cost calculator takes your sessions per week and electricity rate and shows the monthly cost both ways, plus the break-even point.
Winter vs summer
This is the part that surprises people. UK tap water sits around 8–12°C in winter, which is close to plunge temperature already, so a chiller hardly has to do anything — your winter bill is tiny. In summer the tap water climbs to 15–20°C and the chiller works harder to pull it down, so costs rise. It is the opposite of a hot tub.
It also means that if you only plunge in the colder months, you may not need a chiller at all — an insulated tub and the occasional bag of ice can be enough. We cover that trade-off in the chiller vs ice guide.
When a chiller pays for itself
Compare the two columns above. A daily plunger spending £200–300 a month on ice, versus £15–25 on a chiller, saves enough to cover a chiller within about ten months — and far sooner if you would otherwise be buying ice every day. After that, it is close to free cold water.
Three ways to cut your running cost
- Use an insulated lid. It stops the cold escaping between sessions, so the chiller cycles less. The cheapest upgrade there is — see accessories.
- Keep it shaded. A chiller in full sun works harder. A shaded, ventilated spot lowers the bill.
- Keep the water clean. A clogged filter makes the pump strain. Built-in ozone and filtration help, and a quick rinse keeps things efficient.
The honest summary: for regular plunging, a chiller is cheaper, steadier and far less hassle than ice. Browse chillers, or read the full chiller vs ice comparison to decide.
Frequently asked questions
How much does an ice bath cost to run in the UK?+
A chiller costs about £15–25 a month in electricity plus a few pounds for filters. Running on bagged ice instead costs far more — up to £200–£300 a month for a daily plunge in summer.
How much electricity does a chiller use?+
Our 0.9HP unit drew about 1.2 kWh a day on a meter. At 27p per kWh that is roughly 32p a day, or about £10 a month, before filters.
Is it cheaper to run in winter?+
Much cheaper. In winter the tap water is already near the target temperature, so the chiller hardly runs. Summer is when it costs the most.
When does a chiller pay for itself versus ice?+
For a daily plunger, usually within about ten months. The more often you plunge, the faster a chiller pays back.
Does an insulated lid cut running costs?+
Yes. A lid stops the cold escaping between sessions, so the chiller works less. It is the cheapest upgrade for lower bills.