Controls Inside vs Outside the Room

Why panel placement matters

The control panel is the command center for your sauna or steam generator. Where you mount it affects safety, convenience, and how long the device lasts. A panel placed inside the hot room is exposed to temperatures that can exceed 175 degrees Fahrenheit in a traditional sauna, and to high humidity in a steam shower. These conditions can stress electronic components and create burn risks if you touch the panel while reaching over hot rocks or steam. For a traditional sauna, see our best traditional sauna gear guide for models with versatile control placement.

Placing the controls outside lets you start and adjust the heater without entering the room. This is especially useful during the 30 to 60 minute warm-up period for traditional saunas, when you might want to increase heat from a comfortable location. It also keeps the panel away from splashes and condensation, reducing the chance of electrical faults. According to the Cleveland Clinic, saunas are safe when you follow the guidelines of the sauna you are in, and that includes respecting the recommended control placement from the maker.

Traditional sauna controls: inside or outside

Most traditional sauna heaters come with a control box that can be mounted either on the wall near the heater or outside the room. Many manufacturers, including those that make Finnleo and other major brands, allow the controls to be placed just outside the door so you can adjust temperature, timer, and humidity without stepping into the hot air. This is convenient for preheating: you can set the timer and let the room warm up, then enter when it reaches your target.

If you prefer to tweak the temperature while you are inside, a panel mounted on the wall beside the door, inside the room, can work. The key is to keep it away from the heater itself and at a height where you do not have to reach over hot stones. Some newer systems include a separate wall-mounted sensor and a control unit placed in an adjacent area. Always check the manual for the minimum distance from the heater and the maximum ambient temperature the panel is rated for. Learn more about sauna timer functions to plan your preheat schedule.

• Outside placement: best for preheating, safer for children, keeps electronics cool.
• Inside placement near the door: allows adjustments during a session, but check heat ratings.
• Wireless controls: let you move the panel to any spot, including outside, without running low-voltage wires.

Steam shower controls: outside and wireless

Steam showers are different from dry saunas because the room is filled with moisture and the temperature is lower, around 110 to 135 degrees Fahrenheit. However, the high humidity is harder on electronics. For this reason, most steam generator controls are designed to be mounted on the wall outside the shower enclosure, or they use a wireless controller that can be placed on a nearby surface, even on glass. If you are shopping for a steam setup, our best steam generators for a shower guide covers controls and placement options.

Mr. Steam, a major steam generator maker, offers several control options. Their AirTempo control is the industry's first wireless steam shower control, powered by long-lasting batteries, and it can mount on nearly any hard surface, including tile and glass. This eliminates the need to run a cable through the shower wall and makes retrofits easier. Other controls like the iTempoPlus mount nearly flush on the bathroom wall and let you program custom settings for two people. Whichever you choose, the control should never be located inside the steam room unless the manufacturer specifically states it is rated for that wet environment.

Infrared sauna controls and lower heat

Infrared saunas operate at lower temperatures, typically between 110 and 135 degrees Fahrenheit, according to the Cleveland Clinic. That makes it safer to mount the control panel inside the cabin, as the heat is less likely to damage electronics. Many infrared saunas come with a built-in control panel inside the door, often with a touchscreen or buttons for temperature, timer, and interior lighting. For more on choosing an infrared unit, see our best infrared sauna gear page.

Even so, you may still prefer an outside or wireless option if you want to preheat the cabin from a distance or if you are using the sauna in a space where you want to keep all electronics out of reach of children. Also, infrared cabins that are used in humid environments, such as near a shower, can benefit from keeping controls dry. Look for low-voltage controls that are easy to replace, and check whether the panel is certified for moisture resistance.

Safety and certification considerations

Regardless of placement, your control panel should carry a recognized safety certification mark. In the US and Canada, that often means an ETL Listed mark from Intertek, which verifies the product meets applicable electrical safety standards. The ETL mark is accepted by authorities having jurisdiction and inspectors, and it gives you confidence that the control has been tested for hazards like overheating or short circuits. Understanding sauna UL listings can help you evaluate any panel.

Electrical safety is especially important in a room with water and steam. Magnetic fields from wiring and appliances are a normal part of any electrical installation, but NCI notes that electric fields are easily shielded by walls, while magnetic fields can pass through many materials. Keeping the control outside the steam area reduces your exposure to both, though the levels are well below any recognized health risk. Always follow the manufacturer's instructions for mounting, and never place a control where it could fall into water or be splashed directly.

Choosing the right setup for you

Decide based on how you actually use your sauna. If you like to plan a session before you get in, an outside or wireless control is ideal. If you often adjust temperature while sitting inside, a panel just inside the door with a heat-rated faceplate works well. For steam showers, choose a control that is explicitly designed for the bathroom environment, such as a wireless unit that mounts on glass or tile.

Also think about who else will use the room. If you have small children or pets, an outside control prevents curious hands from changing settings or coming into contact with hot surfaces. For outdoor saunas, consider a weatherproof enclosure if the control will be exposed to rain or snow. Whatever you choose, make sure the electrician installs the control according to code and that the control is compatible with your heater or generator. For compact spaces, check our best 1-person sauna gear for placement ideas.

What to pick for your use

Questions

Is it safe to put the sauna control panel inside the room?

Yes, if the manufacturer rates it for that environment. Traditional sauna temperatures can reach 175 degrees Fahrenheit, so only use a control explicitly designed for high heat. Steam shower controls should never go inside the wet area unless marked as waterproof. Always follow the manual.

Can I use a wireless sauna control to operate the heater from outside?

Many modern systems offer wireless controls. Mr. Steam's AirTempo is one example for steam generators. For traditional sauna heaters, check if the heater supports a wireless accessory; otherwise, you may need to run a low-voltage cable to an outside wall panel.

Why do most steam showers have the control on the outside wall?

Steam rooms are humid and hot, which can damage electronics quickly. Mounting the control outside keeps it dry and prevents condensation from entering the circuit board. It also lets you start the generator and preheat the shower before you step in.

What does ETL certification on a control panel mean?

The ETL Listed mark from Intertek shows the product has been independently tested to applicable safety standards. It is accepted by inspectors and meets the same safety requirements as other NRTL marks, so you know the control is safe for its intended use.

Can I mount a sauna control panel on glass?

Some wireless controls, like Mr. Steam's AirTempo, can be mounted on glass because they use adhesive or a mounting kit. Wired panels usually need a flat wall surface. Always check the mounting instructions and the weight of the control before attaching it to glass.