120V vs 240V Sauna: Electrical Requirements Explained
Some smaller saunas and heaters are listed at 120V. Many cabins and stove heaters are listed at 240V and are wired in. Check the listing and the manual for power requirements, and have a licensed electrician confirm your circuit, breaker and wiring.
Estimate / general guidance. This page explains ideas only. It is not a wiring guide.
120V vs 240V: the idea
Homes in the US have 120V outlets for everyday use, and 240V lines for big appliances. Sauna makers list which one their unit needs.
- 120V units include portable steam tents and small infrared cabins. A 120V label does not always mean a normal wall socket. Golden Designs lists its Barcelona cabin at 120V, but calls for a dedicated 120V, 20A circuit for its 4-person Bergamo. VEVOR's 2 kW heater is 120V, and its manual calls for a dedicated circuit.
- 240V units include most traditional stove heaters and Almost Heaven's barrels. These are usually hardwired, which means wired straight into a circuit by an electrician instead of plugged in.
What "dedicated circuit" means
A dedicated circuit feeds one thing only, with nothing else on it. Many sauna makers ask for one. Your electrician decides how to set it up for your home.
How to read a listing's power needs
Look for these on the listing and in the manual:
- Voltage: 120V, 220V or 240V
- Amps: the current the unit draws
- Plug or hardwire: whether it plugs in or must be wired in
- Phase: most home heaters say 1-phase
- Number of supply circuits: some units need two, like Harvia's Virta Combi heater
If the listing and the manual differ, go by the manual and ask your electrician. Some listings say 220V. ZONEMEL, for example, rates its 2-person cabin's heater at 220V. Ask your electrician how that matches your home.
Outdoor power runs
Running power from the house to a backyard sauna is a job for a licensed electrician. A wood-fired sauna needs no power run for its heat, but it has its own chimney and fire-code rules. Check with your local building department and HOA.
What to ask your electrician
- Can my home's electrical service carry this sauna's listed load?
- Does this unit need its own circuit?
- Is it plug-in or hardwired, per the manual?
- Do I need a permit or an inspection for this work?
Where to go next
- Sauna heaters by voltage
- Sauna size guide
- How much electricity a sauna uses
- Installation cost
- Infrared cabins and traditional cabins
Have a licensed electrician confirm your circuit, breaker and wiring, and follow the manufacturer's manual and local electrical code.
FAQ
Does a sauna need a dedicated circuit?
Many manufacturers specify one. Check the listing and the manual for power requirements; consult a licensed electrician.
How many amps does a sauna use?
It varies by model. Use the amperage the manufacturer lists, and have an electrician check it against your home.
Can a sauna plug into a regular outlet?
Only if the manual says so. Some 120V units still need their own circuit, so read the manual and ask an electrician.
What's the difference between a plug-in and a hardwired sauna?
A plug-in sauna has a cord and plug. A hardwired sauna is wired straight into a circuit by an electrician. The listing and manual say which one a model is.
Do I need an electrician to install a sauna?
Hardwired installs need a licensed electrician. For plug-in units, follow the manual. Have a licensed electrician confirm your circuit, breaker and wiring, and follow the manufacturer's manual and local electrical code.
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