Quick answer: a plug-and-play (15 amp) spa is faster, cheaper to install and great for smaller spas used by 1–3 people. A hardwired (32 amp or higher) spa unlocks more pumps, stronger jets and simultaneous operation — better for family-size and premium hydrotherapy. The right choice depends on the spa you're buying, the wiring in your home, and how you want the spa to perform.
What plug-and-play and hardwired actually mean
Every spa needs electricity to run its heater, pumps, jets and controls. How you supply that electricity is what splits the two categories:
Plug-and-play (15 amp)
The spa plugs into a single, dedicated 15 amp power point — slightly different from a standard 10A household outlet but the same shape with a slightly bigger earth pin. The spa has all its electrical safety built in, including residual current protection. You only need an electrician if a 15A outlet doesn't exist where the spa is going.
Hardwired (32 amp and up)
The spa is wired directly into your switchboard via a dedicated circuit, with appropriate cable, breakers and RCD protection (in line with the AS/NZS 3000 wiring rules). A licensed electrician must do the install. Most family-size and premium spas in Australia are hardwired at 32A or 40A, with larger spas and swim spas sometimes needing 50A or more.
Why this isn't just a wiring choice
Here's the thing most spa websites don't say plainly: the wiring decision limits what the spa can do at the same time.
A 15 amp circuit can supply about 3.6 kW. That's enough to run the heater or the main pump on full, but not both flat out together. On a plug-and-play spa, you'll typically heat or use the jets, not both at once. For a 2–3 seater used casually, that's barely noticeable.
A 32 amp circuit can supply about 7.6 kW. Now you can run the heater and the jets together, or two pumps simultaneously, or longer filtration cycles without sharing power. That's why bigger spas with serious hydrotherapy are almost always hardwired — there's just no way to get the experience out of a 15A supply.
Pros and cons
Plug-and-play (15A) — pros
- No electrician needed if a 15A outlet already exists
- Install cost is low — often $0–$600 if wiring needs to be added
- You can take the spa with you if you move (just unplug)
- Lower demand on your home's switchboard
- Often suits smaller backyards and budgets
Plug-and-play (15A) — cons
- Can't run heater and jets at full power simultaneously
- Slower to heat back up after a soak (especially in winter)
- Generally limited to smaller spas (typically 2–4 seater)
- Performance ceiling on hydrotherapy power
Hardwired (32A+) — pros
- Full performance on big pumps, multiple jet zones, simultaneous operation
- Faster heat recovery after a soak — better for daily use
- Available on virtually all family-size and premium spas
- More headroom for accessories and future upgrades
Hardwired (32A+) — cons
- Needs a licensed electrician — typical cost $800–$2,500+
- May require a switchboard upgrade if your home doesn't have spare capacity (older homes especially)
- Less portable if you move
- Longer install timeline because of electrical scheduling
Which one suits your situation?
Plug-and-play is usually the right call if…
- You're buying a 2–3 seater spa (browse our 2–4 person spas)
- You'll use it casually a few times a week, mostly in summer
- Budget is tight and you want to be soaking quickly
- You live in a townhouse, rental or unit with limited electrical work allowed
- You may move within the next few years and want portability
Hardwired is usually the right call if…
- You're buying a 5–6 seater or larger family spa
- You want serious hydrotherapy with strong, simultaneous jets
- You'll use the spa year-round, including winter
- You want shorter recovery times after use
- You're investing in a premium spa and want to use it the way it was designed
The electrical context in Australian homes
A few practical points that matter when you're working out which way to go:
Does your switchboard have capacity?
Many older Australian homes — especially those built before the 2000s — have switchboards near their rated capacity already. Adding a 32A or 40A circuit for a spa can mean a switchboard upgrade, which adds anywhere from $1,200 to $3,000+ to the install. A quick chat with a local electrician before you order can save a nasty surprise. If you've already had solar installed in recent years, your switchboard has probably been updated and there's likely room.
Cable runs and trenching
If the switchboard is a long way from the spa, cable cost goes up. If the cable has to be trenched under a paved area, even more so. For most metro Australian backyards, this is a couple of hundred dollars rather than thousands — but it's worth checking before you finalise the install quote.
Outdoor electrical and weatherproofing
Outdoor circuits need IP-rated enclosures, weatherproof outlets and RCD protection. Any reputable electrician will quote in line with the AS/NZS 3000 wiring rules. Cheap shortcuts here aren't worth it.
Solar and time-of-use tariffs
If you've got solar PV, a hardwired spa can run heavier filtration during sunlight hours essentially for free. On time-of-use tariffs, you can shift heating cycles to off-peak windows. Both flatten running costs nicely.
Cost comparison: install only
Approximate Australian metro install costs in 2026:
- Plug-and-play (existing 15A outlet): $0 (just plug it in)
- Plug-and-play (new 15A outlet added): $200–$600
- Hardwired (existing switchboard capacity, short cable run): $800–$1,500
- Hardwired (long cable run or some switchboard work): $1,500–$2,500
- Hardwired (switchboard upgrade required): $2,500–$5,000+
Add these to the spa price to get a real all-in figure. For more detail on the rest of the install picture, see our spa cost guide.
Performance comparison: what does it actually feel like?
The honest take: on a small spa, the practical difference is small. On a larger spa with serious hydrotherapy ambitions, the difference is huge.
- A 15A 3-seater with a single 1.5 hp pump feels great. The heater pauses while you're soaking — that's fine because the cover holds the heat and there's no real loss in the time you're in.
- A 32A 5-seater with two 2.5 hp pumps runs all jets in all seats simultaneously without lowering pressure. Heater keeps working through the soak. It's a different experience.
- A 40A premium 7-seater can have a dedicated circulation pump, blower, water features and lighting all running together. This is what people mean when they talk about a "true" hydrotherapy spa.
Common gotchas
- Outlet location. A 15A plug should be on a dedicated circuit. Sharing the outlet with other appliances is a common mistake.
- Cable size. The electrician will size the cable for the load and the distance, in line with AS/NZS 3008.1. Skinnier cable than required = voltage drop and reduced performance.
- RCD protection. Every spa circuit needs RCD protection. Make sure the electrician confirms it.
- Pre-install vs post-install. Having the cable laid before the spa lands is much easier than retrofitting around it. Schedule the electrician for a week or two before delivery.
- Compliance paperwork. For hardwired install, you should receive a Certificate of Electrical Safety (CES) or equivalent for your state. Keep it — your insurer may ask for it.
Can you upgrade from plug-and-play to hardwired later?
On most spas, no — the spa is built around one configuration. There are some exceptions (a few models can be switched between 15A and 32A modes), but generally you'd be replacing the spa, not upgrading it. Pick the right configuration up front based on how you'll actually use it.
Frequently asked questions
Can I just use a regular 10 amp outlet?
No. A spa needs a dedicated 15A outlet at minimum. Plugging a spa into a normal 10A household outlet is unsafe, will trip the circuit and isn't permitted under the wiring rules.
Do plug-and-play spas heat slower?
Yes, especially while the spa is being used. Because the heater and pumps share a 3.6 kW budget, the heater pauses or runs at lower power while jets are on. On a small spa with a well-fitted cover, this is barely noticeable. On a larger spa or in cold weather, it can mean the spa takes longer to recover its set temperature.
Is a hardwired spa more expensive to run?
Not significantly. Running cost is mainly driven by insulation, cover quality and how often you use the spa — not whether it's plug-and-play or hardwired. See our breakdown on spa running costs in Australia.
What's the difference between 32 amp and 40 amp?
The amp rating is the maximum current the circuit can supply. 32A gives roughly 7.6 kW; 40A gives roughly 9.6 kW. Larger spas, dual-pump configurations, and premium models often need 40A to run everything together. The electrician sizes the circuit to match the spa.
Will my insurance cover a DIY electrical install?
No, and don't try it. Electrical work for spas must be done by a licensed electrician in Australia. Any DIY install will void your home insurance, the spa warranty, and put you on the wrong side of the law.
Do swim spas always need hardwiring?
Yes — swim spas have larger pumps for the swim current plus the spa pumps, so they're always hardwired, typically at 32A or 40A. Some larger models need a 50A+ supply.
Not sure which is right for your home?
The Just Spas team can talk you through the practical side — what your home's likely capacity is, what spa configurations would suit, and what a typical install in your area looks like. Browse our spa range and swim spa range, then get in touch. We'll point you to the right configuration — not always the most expensive one.
For broader decision support, our spa buying guide walks through everything else that matters when choosing a model.