13A vs 32A Hot Tubs: Plug & Play vs Hardwired Explained (2026)
By Sarb Gill — Founder, Steam & Oak. Last updated June 2026.
The 13A-versus-32A question trips up more first-time hot tub buyers than anything else — and getting it wrong means either an electrician's bill you didn't plan for, or a tub that heats slower than you hoped. This guide explains the difference in plain terms with real numbers, helps you choose, shows which of our tubs are which, and covers what a 32A install actually involves. For what each costs to run, see Hot Tub Running Costs UK; for picking a model, Best Hot Tubs UK; and for the whole buying process, our Hot Tub Buying Guide UK. This one is purely about power.
Contents
- The short answer
- What 13A and 32A actually mean
- Can you run a hot tub on a normal 13A plug?
- What you gain and give up with each
- The convertible (13A/32A) option
- Which of our hot tubs are plug & play vs 32A
- What a 32A install actually involves
- Which should you choose?
- Does 32A cost more to run?
- Our 13A and 32A picks
- FAQ
- The bottom line
1. The short answer
13A (plug & play) means the hot tub plugs into a standard UK socket — no electrician, just a suitable outdoor supply. It's the simplest, cheapest way to get a tub running. The catch: a 13A socket supplies a limited amount of power, so the heater and pumps share it, which means slower heat-up and that the water can cool slightly when you run the jets hard.
32A (hardwired) means a dedicated circuit fitted by an electrician. It supplies more than double the power, so the heater can keep heating at full whack while the pumps run at full power — faster heat-up, stronger jets, no compromise. The catch: the install costs more and needs an electrician.
Neither is universally "better." 13A suits most first-time and casual buyers; 32A suits frequent users who want full performance. The rest of this guide is the detail behind that — with the actual numbers.
2. What 13A and 32A actually mean
The numbers are the maximum current (in amps) the tub's supply can draw, and they translate directly into power and heat:
- A standard UK 13A plug socket supplies up to roughly 3kW (about 3,000W at 230–240V). In practice, plug & play tubs use a 1–2kW heater to stay within that budget while leaving power for pumps and lighting.
- A 32A circuit supplies up to roughly 7.4kW — well over double — so hardwired tubs typically run a 3kW heater alongside more powerful pumps.
A hot tub spends that power on two jobs: heating the water and running the pumps for the jets. With only ~3kW to share (13A), the tub manages the budget — typically prioritising the heater, and easing off heating while the jets are working hard. With ~7.4kW available (32A), there's enough for the heater and powerful pumps to run flat out together. That's the whole difference in one sentence: 13A shares the power; 32A doesn't have to.
3. Can you run a hot tub on a normal 13A plug?
Yes — that's exactly what a "plug & play" hot tub is designed for. It runs from a standard 13A socket, ideally a dedicated outdoor-rated one on its own RCD-protected supply. No electrician is needed to install the tub itself, which is why plug & play is the most popular route for first-time buyers.
What to be realistic about: a 13A tub heats more slowly, and because power is shared, the water temperature can dip slightly during long, hard jet sessions, then recover. For most people topping up a well-insulated, covered tub that's kept warm between uses, this is a non-issue. If you plan to heat from cold often or want spa-strength jets running for ages, that's where 32A earns its keep. Browse the plug-in range at Plug & Play Hot Tubs (13A), and see the dedicated Plug & Play Hot Tubs guide.
4. What you gain and give up with each
Here's the difference in real numbers (heat-up and recovery times reflect typical figures — your tub, insulation and starting temperature all affect them):
| 13A — plug & play | 32A — hardwired | |
|---|---|---|
| Power supplied | ~3kW | ~7.4kW |
| Heater output | 1–2 kW | 3 kW |
| Install | Plug into a suitable socket — no electrician | Dedicated circuit by an electrician |
| Heat-up from cold fill | ~8–14 hours | ~4–6 hours |
| Recovery after use | ~3–6 hours | ~1–2 hours |
| Jets at full + heating | Heating eases off under heavy jet use | Full heat and full jets together |
| Upfront cost | Lower — no electrical work | Higher — add the electrician |
| Best for | First-time, casual, simpler installs | Frequent users wanting full performance |
The thing to take from the table: 13A isn't worse — it heats and recovers more slowly, which barely matters if you keep the tub warm and covered between uses, and matters a lot if you let it cool and reheat from cold often.
5. The convertible (13A/32A) option
Some hot tubs are convertible — they ship ready to run on a 13A plug, but can later be wired to a 32A circuit when you're ready. This is a smart hedge: start plug & play to spread the cost and skip the electrician for now, then upgrade to full 32A performance down the line without changing the tub. If you're torn between the two, a convertible model removes the risk of regret — our Orb Party 7 is one example. Ask us which models in your shortlist are convertible before you order.
6. Which of our hot tubs are plug & play vs 32A
To make it concrete, here's how our range splits:
- Plug & play (13A): the Entry Spa 4, Entry Spa 5, Serenity 3, Elysium 6 and Equinox 7 — including 5, 6 and 7-seaters, so plug & play isn't only for small tubs. See Plug & Play (13A).
- Hardwired (32A): the Aurora, Equinox, the premium Elysium Dual range and the Platinum line. See Hardwired (32A+).
- Convertible: models like the Orb Party 7 that start on a plug and upgrade to 32A later.
So you're not forced to choose 32A just because you want a bigger or more powerful tub — there are plug-in options across the sizes.
7. What a 32A install actually involves
If you choose a 32A tub, here's what the electrical side means in practice. A qualified electrician runs a dedicated 32A circuit from your home's consumer unit (fuse board) out to the tub, with appropriately rated cable and its own RCD protection for safety. It's a standard job for a domestic electrician, but it's a real piece of work — and the cost is separate from the tub and varies with the distance from your consumer unit to the tub and how easy the cable run is. Two practical points: make sure your consumer unit has capacity for the extra circuit (most modern ones do), and arrange the install so the circuit is ready before the tub is delivered. If running a new circuit is awkward or expensive at your property, that's a strong reason to choose plug & play or a convertible model instead.
8. Which should you choose?
Match it to how you'll actually use the tub:
- Choose 13A if: it's your first tub, you'll keep it warm and covered between uses, you want the simplest possible install, or running a new circuit is awkward or expensive at your property.
- Choose 32A if: you'll use it often, want fast heat-up from cooler temperatures, want the strongest jet performance, or you're buying a larger, jet-heavy tub where the extra power genuinely helps.
- Choose convertible if: you want to start simple but keep the door open to full performance later.
9. Does 32A cost more to run?
This is the most common myth, and the honest answer is: not inherently. Running cost is driven mainly by insulation, how warm you keep the water, your usage and your tariff — not by the amperage rating. A 32A tub heats faster and recovers quicker, which can actually make it more efficient for frequent or daily users, because it spends less time clawing back lost heat. And 32A tubs are typically the ones compatible with a heat pump, which is the single biggest way to cut running cost. A well-insulated 32A tub kept covered can run very economically; a poorly insulated 13A one can cost more. We break down the actual numbers — including the 13A-vs-32A comparison and heat-pump savings — in Hot Tub Running Costs UK, and you can get a model-specific figure from our running-cost calculator.
10. Our 13A and 32A picks
13A / plug & play: the Entry Spa 5 (£4,495, 5 seats) for the simplest start, or the Serenity 3 lounger (£4,899) for couples.
32A / hardwired: the Aurora (£6,699, 6 seats) or Equinox (£6,099, 7 seats) for high-power family use, up to the Elysium Dual Max (£7,399, 75 jets) for full hydrotherapy.
Not sure which model fits your power and use? Our Best Hot Tubs UK guide picks a winner for every category, and the Compact and Family guides cover those use cases.
11. FAQ
Can you plug a hot tub into a normal socket?
Yes — a "plug & play" hot tub runs from a standard 13A UK socket, ideally a dedicated outdoor-rated, RCD-protected one. No electrician is needed to install the tub itself, which makes it the easiest route for first-time buyers.
How many amps does a hot tub need?
Plug & play hot tubs run on a standard 13A supply (about 3kW). Hardwired hot tubs use a dedicated 32A circuit (about 7.4kW), and the largest spa pools can need 40A. The more amps available, the more power for heating and jets at the same time.
Is 13 amp enough for a hot tub?
For most users, yes. A 13A supply (~3kW) comfortably runs a plug & play tub that's kept warm and covered between uses. The trade-off is slower heat-up (around 8–14 hours from cold, versus 4–6 for a 32A tub) and that the water can cool slightly during heavy jet use, because the heater and pumps share the available power.
Do plug-and-play hot tubs get hot enough?
Yes — a 13A plug & play tub reaches and holds the same temperatures as a hardwired one; it just heats more slowly and recovers more slowly after use, because it has less power to share between the heater and pumps. Kept warm and covered between uses, it stays ready without issue.
Do I need 32 amp for a hot tub?
Only if you want full performance — fast heat-up from cold and the heater running at full power while the jets are at full power. A 32A circuit (~7.4kW) provides that, but needs an electrician to install. Frequent users and larger, jet-heavy tubs benefit most.
What's the difference between 13 amp and 32 amp hot tubs?
A 13A hot tub plugs into a normal socket and supplies about 3kW, shared between heating and pumps, with a 1–2kW heater. A 32A hot tub uses a dedicated hardwired circuit supplying about 7.4kW with a 3kW heater, so it can heat and run powerful jets simultaneously and heats and recovers faster. 13A is simpler and cheaper to install; 32A delivers stronger, faster performance.
Can a 13 amp hot tub be upgraded to 32 amp?
Some models are convertible — they run on a 13A plug initially and can be wired to a 32A circuit later for full performance, without replacing the tub. Check whether a specific model is convertible before buying if you might want to upgrade.
Does a 32 amp hot tub cost more to run?
Not inherently. Running cost depends mainly on insulation, how warm you keep the water, usage and tariff — not the amperage. A 32A tub's faster recovery can make it more efficient for frequent users, and 32A models are usually the ones compatible with a heat pump, which cuts running cost most. See our running-costs guide for the detail.
12. The bottom line
If you want the simplest, lowest-cost install and you'll keep the tub warm between dips, go 13A plug & play — it's right for most buyers, and there are plug-in options up to seven seats. If you'll use it often and want full heat-and-jet performance and heat-pump compatibility, run a 32A circuit. If you can't decide, buy a convertible model and start on the plug. Then pick the actual tub with our Best Hot Tubs UK guide, and check what it'll cost in Hot Tub Running Costs UK. Still unsure? Tell us your property and how you'll use it, and we'll tell you straight which power suits you.