Spa Running Cost Australia: kWh, Tariffs and a Worked Bill

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A covered 1,300-litre spa costs about $45–$95 a month in electricity in Australia. That assumes it holds heat as well as the California standby limit allows, about 5.4–7.2 kWh a day, plus 13 half-hour soaks, priced at each network’s 2026–27 regulated flat rate of 25.96c to 41.91c per kWh.

The short answer

The worked bill: $57–$75 a month on Ausgrid’s 33.14c/kWh, or $689–$905 a year, for a 1,300 L spa that meets the California standby limit, before any spa cost, chemicals or supply charge.
Standby is most of it. California’s limit for a standard spa is 3.75V^2/3 + 40 watts (V in US gallons), which is 224W or 5.37 kWh a day for 1,300 L at a 21°C water-to-air gap.
The tariff moves the bill by 61%. Regulated 2026–27 flat rates run from 25.96c/kWh (CitiPower, Victoria) to 41.91c/kWh (SA Power Networks), set by the AER and Victoria’s Essential Services Commission.
A fresh fill costs about $10 to heat. Lifting 1,300 L by 20°C takes 30 kWh, about 10 hours on a 3 kW heater, the common size on a 15 amp plug-in spa.
Vendor estimates agree on the order. Published guides give $1.50–$4.00 a day, or $30–$50 a month in summer and $60–$100 in winter for a well-insulated spa.

Worked monthly electricity cost of a covered 1,300 L spa: 163 kWh standby in a mild month (21°C water-to-air gap) or 218 kWh in a cold month (28°C gap), plus 9.75 kWh of jets, at 2026–27 regulated flat rates (incl. GST, read 6 October 2026)
Network or plan	Flat rate per kWh	Mild month	Cold month	Year, all mild to all cold
NSW, Ausgrid (DMO)	33.14c	$57	$75	$689–$905
NSW, Endeavour Energy (DMO)	33.73c	$58	$77	$701–$921
NSW, Essential Energy (DMO)	35.01c	$61	$80	$728–$956
South East Queensland, Energex (DMO)	27.97c	$48	$64	$581–$764
South Australia, SA Power Networks (DMO)	41.91c	$73	$95	$871–$1,145
Victoria, CitiPower (VDO)	25.96c	$45	$59	$540–$709
Victoria, AusNet Services (VDO)	31.98c	$55	$73	$665–$874
WA, Synergy Home Plan A1	33.26c	$58	$76	$691–$909

How much does a spa cost to run per month? The worked calculation

A spa’s running cost is kilowatt-hours multiplied by your tariff. The tariff is published. The kilowatt-hours are the hard part, because no Australian regulator labels spas for energy the way pool pumps are labelled. So this page uses the closest thing to a published standard: the California Energy Commission’s standby rule, which caps how much power a portable electric spa may use. It applies to spas sold in California, and the figure is a ceiling the spa must meet under test, not a measurement of any spa sold here.

The rule, in Title 20 section 1605.3, Table G-5: a standard spa made on or after 1 June 2019 may draw no more than 3.75V^2/3 + 40 watts, where V is the fill volume in US gallons. The reading is normalised to a 21°C gap between water and air, and the US Department of Energy’s test method for portable spas defines standby loss as the power needed to run the spa in its default mode with the cover on.

Volume: 1,300 L is 343.4 US gallons. One Australian spa-parts supplier says most smaller spas hold 1,000–1,300 litres and most larger ones 1,300–1,700.
Standby: 3.75 × 343.4^2/3 + 40 = 223.9W, or 5.37 kWh a day and 163 kWh a month at a 21°C gap.
Cold month: the rule normalises the reading in proportion to the temperature gap, so at a 28°C gap the same spa uses about 299W, 7.16 kWh a day, 218 kWh a month.
Use: 13 half-hour soaks a month with a 1.5 kW jet pump is 9.75 kWh. One spa maker’s guide says pumps usually run around 1,500 watts.
Ausgrid’s flat default market offer, 33.1372c/kWh: (163 + 9.75) × $0.331372 = $57.39 in a mild month; (218 + 9.75) × $0.331372 = $75.45 in a cold one.

The quotable version: a covered 1,300-litre spa that meets California’s standby limit uses about 5.4 kWh a day, which is $54 a month at Sydney’s regulated flat rate before anyone gets in.

What the calculation leaves out: the heat lost while the cover is off for a soak (it depends on wind and air temperature, and we found no published figure), the daily supply charge you pay anyway, and any spa that is worse than the California limit. A spa sold without that certification may use more.

What rate should I use? The regulated tariff in each state

Use the rate on your own bill if you have it. If you do not, the regulated default offers are the published benchmark, and they are what the table uses.

In NSW, South East Queensland and South Australia the Australian Energy Regulator sets the default market offer, a cap on standing-offer prices. Its 2026–27 final determination (Figure 2.1, including GST) sets the residential flat usage charge at 33.1372c/kWh for Ausgrid, 33.7273c for Endeavour Energy, 35.0054c for Essential Energy, 27.9744c for Energex and 41.9103c for SA Power Networks.

In Victoria the Essential Services Commission sets the Victorian Default Offer. Its 2026–27 price determination (Schedule 1) puts the domestic flat usage charge between $0.2596/kWh in CitiPower’s zone and $0.3198 in AusNet’s, with Jemena ($0.2747), Powercor ($0.2822) and United Energy ($0.2735) in between.

In Western Australia most households on the main grid buy from Synergy, whose Home Plan A1 is published at 33.2621 cents per unit, including GST, as read on 6 October 2026.

Market offers can be cheaper than these caps, and a time-of-use tariff changes the arithmetic: a spa that heats in the middle of the day on a solar-soak rate costs less than one heating in the evening peak. If your controller lets you set heating windows, that is where the saving is.

The quotable version: the same spa costs 61% more to run on SA Power Networks’ 41.91c/kWh than on CitiPower’s 25.96c, because the tariff is the multiplier on every kilowatt-hour.

What does it cost to heat a spa from cold?

Every fresh fill has to be heated from tap temperature. The physics is fixed: one kilowatt-hour raises about 860 litres of water by 1°C. Lifting 1,300 litres by 20°C, say from 18°C to 38°C, takes 1,300 × 20 ÷ 860 = 30.2 kWh, about $10 at Ausgrid’s default rate, before losses.

How long it takes depends on the heater. An Australian spa-parts supplier’s heater guide uses the same arithmetic (about 1°C per kilowatt per hour for 853 litres) and works a 1,500 litre spa at 1.14°C an hour on a 2 kW heater. A spa-equipment wholesaler’s guide to plug-in spas sets out the electrical limit: a 3 kW heater draws 12.5 amps, leaving 3.25 amps for the pump that runs with it on a 15 amp plug-in system. That is why most plug-in spas heat slowly, and why a 1,300 litre fill on 3 kW takes about 10 hours.

The quotable version: heating a fresh 1,300-litre spa fill by 20°C takes about 30 kWh, roughly $10 of electricity, every time the spa is drained.

A bigger heater does not use less energy to do the same job; it does it faster. Running cost is set by heat loss and tariff, not by the heater rating. Heat pumps change that, because they move heat rather than make it; solar, gas and heat pump heating compared sets out how they compare on pools.

Why do spa running costs vary so much?

Four things move the bill, in this order.

The cover. The California test is run with the cover on, so its ceiling is a covered figure. A spa left uncovered loses heat continuously from the surface, which is why every spa maker’s energy advice starts with the lid.

The air temperature. Standby rises in proportion to the gap between water and air. Going from a 21°C gap to a 28°C gap adds a third, which is the difference between $57 and $75 a month in the table.

The tariff. 25.96c to 41.91c per kWh across the regulated offers.

The spa itself. The California rule is a limit, and good spas beat it. One spa maker publishes ‘as little as $30 a month’ for a well-insulated spa, and $40 a month in summer and about $70 in winter for a premium spa used every other day in Sydney. Inflatable spas are allowed more: their limit is 7V^2/3, which for an 800 litre inflatable is about 248W, more than the 224W allowed for a 1,300 litre hardshell.

The vendor estimates agree on the order of magnitude. One national cost guide publishes electricity at $1.50–$4.00 a day, or $500–$1,500 a year, plus $300–$500 a year in chemicals and $50–$100 in filters. Another says a well-insulated spa adds $30–$50 a month in summer and $60–$100 in winter. Both are vendor-published, and neither states its tariff.

The quotable version: a spa’s running cost is set by its insulation, its cover and the night air, and the heater size only decides how long it takes.

Installed costs, the slab, the circuit and the barrier are on what a spa costs to install, and swim spa costs covers the larger option. If you are weighing a spa against a heated pool, what a pool costs to run per year has the pool side, and you can compare pool quotes for both on the same site.

Common questions

How much does a spa cost to run per month in Australia?

About $45–$95 a month in electricity for a covered 1,300 litre spa that meets California’s standby limit, at 2026–27 regulated flat rates. On Ausgrid’s rate in the AER’s 2026–27 default market offer, 33.14c/kWh, it is $57 in a mild month and $75 in a cold one.

How many kWh does a spa use per day?

A 1,300 litre spa built to the California Title 20 standby limit (3.75V^2/3 + 40 watts, V in US gallons) uses up to 5.4 kWh a day with the cover on and a 21°C water-to-air gap, and about 7.2 kWh at a 28°C gap. Soaks with the jets running add to that.

How much does it cost to heat a spa?

Heating a fresh 1,300 litre fill by 20°C takes about 30 kWh, roughly $10 at 33c/kWh. A 3 kW heater, the usual size on a 15 amp plug-in spa, takes about 10 hours to do it.

Is a spa cheaper to run than a pool?

It depends on whether the pool is heated. Our worked figure for a covered 1,300 litre spa is about $540–$1,145 a year in electricity across the 2026–27 regulated tariffs. Pool running costs per year sets out the pool side so you can compare like with like.

What is the cheapest electricity rate for running a spa?

Among the 2026–27 regulated flat rates, CitiPower’s zone in Victoria has the lowest at $0.2596/kWh in the Essential Services Commission’s VDO price determination, and SA Power Networks the highest at 41.91c. A market offer or a time-of-use plan with cheap midday hours can beat both.

Sources

General information only, current at 2026-10-06. Pool rules differ by state and by council, and penalty amounts are updated regularly. Confirm your own obligations with your council or a registered inspector before acting.

How much does a spa cost to run in Australia?