Electrical Requirements (13A vs 32A/40A)

Hot Tub Electrical Requirements

Hot tubs and swim spas require the correct electrical supply before installation. Please use a qualified electrician and follow UK regulations (including Part P where applicable).

Step 1: Check what your model needs

  • 13A Plug & Play (simplest install, standard outdoor socket approach)
  • 32A / 40A Hardwired (higher performance, dedicated supply)

In all cases, the hot tub should have its own dedicated circuit from the main distribution board (not shared, not spurred from high-current ring mains).

13A supply (recommended “best practice”)

While some 13A hot tubs can run from a standard outdoor socket, the stronger recommendation is a 16A outdoor waterproof commando socket with RCD protection, on a dedicated supply.

  • Install a dedicated outdoor supply (avoid spurring off kitchen ring mains or other high current circuits)
  • Outdoor socket position: typically 2–5m from the hot tub
  • Cable approach depends on installation, but a protected outdoor run (e.g. mechanically protected where required) is recommended

Some installers specify that the flexible cable length cannot exceed 5m — so placing the outdoor socket within 2–5m helps avoid issues.

32A / 40A supply (hardwired models)

For 32A or 40A models, your electrician typically needs to:

  • Add a 32A/40A Type C breaker to the consumer unit
  • Run a 6mm, 3-core armoured cable to a rotary isolator switch
  • Position the isolator approximately 2–5m from the hot tub (and at least 2m from the edge where possible)
  • Leave a loop of spare cable at the isolator (guidance varies: 5m minimum in some installs, 10m in others — aim for 10m unless your electrician advises otherwise)
  • Provide a Part P certificate confirming compliance

Some delivery/installation processes allow the team to connect the prepared cable into the tub, but they may not hardwire to the mains supply — so the supply needs to be correctly prepared in advance.

Safety note

Many guides recommend an earth rod depending on the earthing arrangement of the property and the electrician’s assessment. Your electrician will confirm the correct approach for your installation.

Important: If the relevant electrical steps are not completed before delivery, installation may be delayed or rescheduled.