No. You should not run any hot tub, including an inflatable one, from an extension lead, even an outdoor waterproof one. Hot tubs draw a lot of current for hours at a time. Extension leads can overheat, connections get wet, and the built-in safety device may not protect you properly at the end of a long lead.
Why extension leads and hot tubs don’t mix
- Heat: First, a heater running for hours can make a lead or reel overheat, especially if it is coiled.
- Water: Also, joints and plugs sitting on wet ground are a shock risk, however “waterproof” the lead is.
- Voltage drop: In addition, long leads reduce voltage, making pumps and heaters work harder.
- Warranty: Finally, manufacturers of inflatable hot tubs, including the big brands, tell you not to use one.
How to power an inflatable hot tub safely
Instead of a hot tub extension lead, plug it directly into a weatherproof outdoor socket protected by an RCD, close enough that the hot tub’s own lead reaches without strain. If you don’t have one, a registered electrician can fit an outdoor socket quickly and at modest cost.
How to power a hard-shell hot tub
Most acrylic hot tubs are hard-wired on a dedicated circuit from your fuse board, typically 16A or 32A, with an outdoor isolator switch near the tub. This must be done by a registered electrician. In the Republic, look for a Safe Electric registered contractor, who will certify the work. See our full guide to hot tub electrical requirements.
What about saunas and ice baths?
The same rule applies: no extension leads. Small infrared saunas can often plug into a wall socket; electric sauna heaters and chilled plunge tubs usually need their own supply.
Frequently asked questions
Can I use an outdoor extension reel for my Lay-Z-Spa?
No. Inflatable hot tub manufacturers advise against extension leads. Plug directly into an RCD-protected outdoor socket.
How far can a hot tub be from the socket?
For a plug-in tub, close enough for its own lead to reach comfortably. For a hard-wired tub, your electrician will size the cable for the distance.
Do I need an electrician for a plug-in hot tub?
Only if you need a new outdoor socket. Fitting one should always be done by a registered electrician.
What size supply does a hot tub need?
Plug-in tubs use 13A. Most hard-shell hot tubs need a dedicated 16A or 32A supply, depending on the model.
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