Sauna electrical requirements
The short answer
Infrared saunas up to about 2.4 kW can often plug into a standard socket. Traditional electric saunas, with heaters of about 4.5 to 9 kW or more, need a dedicated circuit. Any new wiring, including the cable to a garden sauna, must by law be done by a registered electrical contractor, who gives you a completion certificate.
What each type needs
| Sauna | Typical heater | Supply |
|---|---|---|
| Indoor infrared, 1 to 3 people | 1.4 to 2.4 kW | Often a standard socket. Check the model. |
| Indoor infrared, 4 people | About 3.4 kW | Check with the seller; may need its own circuit. |
| Indoor traditional | About 4.5 to 6 kW | A dedicated circuit. |
| Garden traditional | About 6 to 9 kW, sometimes more | A dedicated circuit and a cable from the house. |
| Garden wood-fired | No electric heater | Lighting only, if any. |
Heater sizes from sellers' published specifications. Always use the rating of the sauna you're buying.
The law
In Ireland, electrical work in your home must be done by a registered electrical contractor (REC). RECs are registered with Safe Electric, which the Commission for Regulation of Utilities oversees. When the work is finished, the contractor must give you a completion certificate confirming it's safe and meets the standards. Keep it: you may need it for your insurer, and when you sell the house.
Garden saunas
- The cable run. The electrician runs a cable from your fuse board to the sauna. The further the sauna is from the house, the longer the run and the higher the cost, so price the electrics before you choose the spot.
- Your fuse board. It may need a spare way, or an upgrade, for a new circuit. Ask early.
- The heater's rating. Give the electrician the exact kW before they size the cable.
- Extras. Lights, a control panel inside the house, or a pump for a plunge tub may need wiring too.
What to ask your electrician
- Is there room on my fuse board for a sauna circuit, or does it need upgrading?
- What will the cable run cost from the board to where I want the sauna?
- For a plug-in infrared sauna: can this socket's circuit take it alongside what's already on it?
- Will you provide a completion certificate?
Common questions
Can I plug a sauna into a normal socket?
Many infrared saunas, yes. Irish sellers say their infrared models run from a standard socket or a 13 A supply, up to about 2.4 kW. Traditional electric heaters, usually 4.5 to 9 kW or more, cannot: they need a dedicated circuit installed by a registered electrical contractor.
Does a sauna need its own circuit?
A traditional electric sauna does. A plug-in infrared sauna usually doesn't, but it draws a lot of power for a long time, so ask an electrician whether the socket's circuit can take it alongside anything else on it.
Who can wire a sauna in Ireland?
A registered electrical contractor. It is the law for electrical work in your home, and they must give you a completion certificate.
Sources
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