The short answer: a 900 W chiller costs 29 cents an hour to run at the national average electricity rate, or 39 cents in South Australia. What that comes to per day depends entirely on how many hours the compressor actually runs, which depends on your tub's insulation, whether there is a lid on, and how hot the room is. Realistic daily figures land between about 60 cents and $3.15.
That is a wide range and it is the honest one. Anyone quoting a single daily figure without stating the tub and the conditions is describing their own setup, not yours. Below is the arithmetic so you can work out which end of the range you are at.
The calculation
Three steps, same as any appliance.
Step one. 900 watts is 0.9 kilowatts.
Step two. Multiply by the hours the compressor actually runs. Not the hours the unit is switched on: the hours it is working. A thermostat-controlled chiller spends much of its time idle.
Step three. Multiply by your rate. Finder put the national average residential usage rate at about 32 c/kWh (updated 2 September 2026). Canstar Blue put the national range at 24 to 45 c/kWh and South Australia highest at 43.7 c/kWh (May 2026).
One hour of compressor time is therefore 0.9 kWh, which is 29 cents nationally and 39 cents in South Australia.
| Compressor run time | Energy/day | Per day, national | Per day, SA | Per year, SA |
|---|---|---|---|---|
| 1 hour | 0.9 kWh | $0.29 | $0.39 | about $144 |
| 2 hours | 1.8 kWh | $0.58 | $0.79 | about $287 |
| 4 hours | 3.6 kWh | $1.15 | $1.57 | about $574 |
| 8 hours | 7.2 kWh | $2.30 | $3.15 | about $1,148 |
Reading the one published competitor figure
Only one Australian chiller seller publishes a running cost that I could verify. Vital+ state "$0.50c, running the chiller for the average 8–12 hours" per day on their Ultra X2 in an insulated tub (September 2026).
Worth unpacking, because it teaches you how to read these claims. Fifty cents a day at a typical Australian rate is roughly 1.2 to 1.5 kWh. Spread over eight to twelve hours, that implies an average draw of about 100 to 190 watts.
No chiller compressor runs at 150 W. What that figure almost certainly describes is the unit being powered on for eight to twelve hours while the compressor cycles briefly within that window. Which is the correct way to think about it: the hours that matter are compressor hours, not switched-on hours.
Taken that way, their figure is entirely consistent with the table above at the one-hour-a-day end, which is what a well-insulated tub with a lid should need once it is at temperature.
What actually drives your duty cycle
The lid, more than anything else
Most of the heat re-entering a cold tub comes in through the open water surface, by conduction to the air above it and by evaporation. A fitted lid or an insulated cover cuts that dramatically.
If you buy one accessory, buy a cover. It does more for your electricity bill than any specification on the chiller.
Insulation
A purpose-built drop-stitch or barrel tub is insulated. A bathtub is not: acrylic and steel both conduct heat away readily, and a bath sits in a room you are also heating in winter.
This is the main running-cost penalty of the bathtub approach, and it is genuine. An insulated mat under and around the tub helps where it is practical.
Ambient temperature
A chiller removes heat from water and dumps it into the room. In a 38°C garage in February, the condenser struggles to shed that heat and the whole cycle works harder for the same result. The same setup in a 15°C garage in July barely runs.
Expect your summer bill to be several times your winter one.
Water volume
More water means more thermal mass to hold cold, which cuts both ways: slower to cool down, slower to warm up. A larger tub costs more to bring to temperature initially and is not proportionally more expensive to hold there.
Whether you keep it running
The biggest decision. Leaving a chiller holding temperature continuously costs the figures above. Cooling from scratch before each session costs much more in total energy but only on the days you use it.
For three or more plunges a week, holding is usually cheaper and always more convenient. For one plunge a week, switching off between sessions makes sense.
The costs that are not electricity
Water. A tub gets changed periodically rather than every session, which is one of the chiller's advantages over ice. How often depends on use and on your hygiene routine, covered in how to clean an ice bath chiller.
Filters. Any chiller with filtration has a consumable in it. Ask about replacement intervals and cost before buying, from any brand.
Nothing else, really. There is no gas, no chemicals in the sense a pool needs, and no servicing schedule published by most domestic sellers.
Against the alternative
The comparison that matters is not chiller against chiller, it is chiller against bags of ice.
Cooling a 150 L bath from 20°C to 10°C takes roughly 16.7 kg of ice, which is about three and a half 5 kg bags. At $5.99 a bag through Dan Murphy's (September 2026) that is $20.01 per plunge, every time.
Even at the pessimistic end of the table above, a chiller running four hours of compressor time a day costs $1.57 in South Australia. The full break-even arithmetic, including how it shifts if you plunge at 15°C rather than chasing 3°C, is in chiller versus buying ice.
Work out your own cost
- Chiller watts ÷ 1000 = kilowatts. The Ice Drop Chiller is 900 W, so 0.9 kW
- × hours of compressor run time per day, not hours switched on
- × the usage rate on your bill in cents per kWh
- A plug-in energy meter gives you the real duty cycle in a day
- Biggest lever: a lid. Second: insulation. Third: where the unit lives
- These are calculated figures from rated wattage, not metered results
Frequently asked questions
How much does an ice bath chiller cost to run in Australia?
A 900 W unit costs 29 cents per hour of compressor run time nationally, or 39 cents in South Australia. Daily totals land between roughly 60 cents and $3.15 depending on insulation, lid use and ambient temperature. Well-insulated setups sit at the low end.
Is it cheaper to leave a chiller running or turn it off?
For three or more plunges a week, leaving it holding temperature is usually cheaper and always more convenient, because holding is a much smaller job than cooling from scratch. For weekly use, switching off between sessions makes more sense.
Does a lid really reduce running costs?
Substantially. Most heat re-enters a cold tub through the open water surface, by conduction to the air and by evaporation. A fitted cover is the single most effective thing you can add, and it costs less than almost any other accessory.
Why do chiller running costs vary so much between sellers?
Because the conditions differ and are rarely stated. Insulation, lid use, ambient temperature, water volume and whether the figure counts compressor hours or switched-on hours all move it. One Australian seller publishes about 50 cents a day for an insulated tub; that is their setup, not a universal figure.
How much does a chiller add to your power bill?
At two hours of compressor time a day, about $287 a year in South Australia or $210 at the national average. At one hour a day, roughly $144 and $105 respectively. South Australia has the highest average rate in the country, so most states pay less.
Do chillers cost more to run in summer?
Yes, and the difference is large. The unit removes heat from water and releases it into the surrounding air, so a hot room makes the whole cycle work harder while heat also leaks back into the tub faster. Expect summer running costs several times winter ones.
Where the Ice Drop Chiller sits
At 900 W, which is the lower end of the Australian market and part of why it runs from a standard plug rather than needing anything special. The figures on this page are calculated from that rating rather than metered on our own unit, and I would rather say so than present arithmetic as a test result.
Specifications are on the Ice Drop Chiller product page.
Related reading