Sauna Controls

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The control is what turns a heater into something you use on a Tuesday. Timers, Wi-Fi, and the difference between walking out to it and starting it from the kitchen.

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Sauna Controls: Matched to the Heater, Not Chosen on Features

A sauna control is two boxes, not one. The panel you touch sets the temperature and the timer. A power unit, usually on a dry wall outside the hot room, does the heavy switching between your electrical panel and the heater.

That second box is why the choice is narrower than it looks. Each one publishes the heater load it can carry, and that figure can change with your supply. The heater's own page names the control its maker pairs with it.

Sauna control panel with a touch screen on a dark wall outside the hot room, beside a row of hanging towels
6 inMax sensor distance from the ceiling in the residential code
240V / 208VVersions for home and commercial supply
194°FRoom temperature cap in the residential code
FactoryAuthorized dealer, every brand

First question

Do You Need a Separate Sauna Control?

It depends on the heater, and the model code usually tells you before the price does.

Controls on the heater

The timer and thermostat sit on the heater body. There's nothing else to buy or wire, but you start it standing in front of it. Built-in controls are found on smaller heaters, so larger rooms usually need a separate control.

Heater with no controls

Many heaters ship with no controls at all and won't run until a separate control is wired to them. That control is a second purchase with its own load rating, so price the heater and the control together before you compare anything.

Wood-burning stove

No elements, no circuit and nothing for a control to switch. You set the heat with the fire and the amount of wood. Everything else on this page is about electric heaters, which is where the control decision actually sits.

Buying a complete sauna rather than a heater? Check that sauna's own page for the heater and control it comes with before you add a second control. This page is for rooms where the heater and the control are bought separately.

Matching

Matching a Sauna Heater Controller to the Heater

Three numbers decide it: the heater's output, your supply voltage, and how many groups the heater is wired in.

Every control publishes a maximum heater load, and the headline figure on a listing is usually the best case. One manufacturer's smaller wall control is rated for 7 kW at 240V single phase on one group. The same unit carries 10.5 kW at 208V three phase, and 11 kW when the heater is wired as two groups. Its larger sibling reaches 10.8, 15 and 17 kW on the same three terms.

So a control that ran your old 6 kW heater may not carry a 9 kW replacement on a house supply. Read the rating at your voltage, then check the heater page for the control its maker pairs with it. Size the heater first with our Heater Finder, then match the control to the result.

Extension units for the largest heaters

Above a certain load, the control can't switch the heater on its own, and an extension unit carries the extra current. One maker's matched control runs heaters up to 11 kW from its main module and adds an extension box for its 12, 15 and 18 kW heaters. Another lists a power extension unit beside the control for its largest heaters, the 16 and 20 kW models.

An extension unit isn't a control. It can't run a heater by itself, and the same electrician wires it in beside the main unit, on a separate breaker where the manual calls for one.

Combination controls for steam

A combination heater adds a water reservoir and a steamer element, and it needs a control built to run both. The combination controls here drive a steamer of up to 2.1 kW alongside the heater elements, using a humidity sensor mounted away from the heater. That maker's standard wall controls can't drive the steamer side. Another maker's matched control has a steamer output of its own, for the steamers its manual approves.

Supply

240V Single Phase or 208V Three Phase Versions

Homes in North America usually have the first, and many commercial buildings have the second. Confirm it from your electrical panel's label or with your electrician, not from the building type.

Swipe the table to see every column.

Your situation Supply What changes for the control What to order
Home, one heater circuit 240V single phase Often a lower load rating than at 208V A control rated for your heater at 240V
Gym, hotel or apartment block Often 208V three phase Higher one-group rating; some lines split by supply The 208V version where the line splits
Heater wired as two groups 240V single phase The two-group rating applies A control with a two-group rating
Heater above the control's rating Either An extension unit carries the extra load Control plus the listed extension unit
Combination heater Either Ratings and group counts differ by supply The combi version for your panel

Some controls are one unit wired for either supply. Others are sold as separate 240V and 208V versions with different part numbers, and one won't run on the other's supply. On one maker's two-group wiring at 240V, the manual calls for a small two-breaker subpanel, supplied by your electrician.

The costly mistake is ordering by the heater's headline kilowatts. Wired as one group, a 9 kW heater on a house supply needs a control rated for 9 kW at 240V. On one common control line, that's the larger unit, not the smaller one. Send us both model numbers before you order.

Remote start

WiFi Sauna Controls or a Local Control Panel

WiFi lets you start the heater from your phone, so the room is hot when you get there. A local panel does the same job from the wall by the sauna door.

WiFi sauna controller

Connects the control to your home network and an app. You can set the temperature, watch the room heat and, depending on the unit, start the heater from away. Check two things first: which WiFi band the unit joins, and whether the signal reaches where the power unit will hang.

Local control panel

Everything happens at the panel: on, off, temperature and the timer. There's nothing to pair and no signal needed at the sauna. One maker sells its local panel with a paid in-app upgrade to WiFi later, activated remotely without a technician visit.

Hand holding a smartphone that shows a sauna temperature dial, outdoors in evening light
The app shows the room temperature as it climbs. Whether it can also start the heater depends on the unit.

How app access is sold

Read this part of the product page closely, because makers sell it differently. One includes app start with its WiFi control from the first day. Another ships its newest panels with free app monitoring and a three-month trial of remote start. After the trial, remote start on those panels is a one-time paid upgrade tied to the panel, not a subscription.

Remote start comes with a safety step

The manuals put conditions on remote start, because a heater must not start with anything on or near it. One maker's manual says the room and the heater's surroundings must be checked before the control goes into remote or pre-timed standby. Another requires a door sensor and a confirmation at the panel, and cancels it if the door opens again.

Whether that routine earns its cost is covered in whether the WiFi upgrade is worth it. If your sauna sits across a cold yard, our outdoor sauna in winter guide explains why owners start the heater from the house.

Installation

Sauna Control Panel Installation: What Goes Where

There are three parts to place: the power unit, the panel and the temperature sensor. Plan all three before the walls close.

Power unit

On a wall outside the hot room, in a dry place. One maker says it must not be recessed into the wall, and outdoors it needs a cover. The other allows it inside only where outside is impossible, mounted low and well away from the heater.

Control panel

Usually beside the sauna door, at eye level. Some panels are rated for the hot room if kept low and away from the heater, while plastic panels stay outside. A data cable links panel and power unit, and the manual sets its maximum length.

Temperature sensor

Above the heater and close to the ceiling, exactly where the heater's manual puts it. The residential code wants it within 6 inches of the ceiling when the thermostat isn't on the heater. Keep it clear of air vents, which cool it and let the heater overrun.

Wood-cased sauna control panel with a round dial, mounted on a timber wall
Some panels are rated to sit inside the hot room, kept low and away from the heater. Check the manual before you put one there.

What the electrician still does

Sauna controls that switch the heater's current are hardwired. The manuals for these controls call for a licensed or qualified electrician, and their makers' warranty terms ask for proof of that work with a claim, so keep the invoice.

Sensor and panel cables run apart from mains wiring, as the manuals require, because interference upsets the readings. The panel controls here can also switch a sauna light, a fan or both, depending on the unit. One manual caps each of those outputs at 100 W at 120V and rules out LED lights that need a transformer.

Before you order

Six Checks Before You Order a Sauna Control

Each of these takes a minute now and saves a return later.

  • Read the heater's model code. It tells you whether controls are built in or bought separately.
  • Confirm the supply at the panel. 240V single phase and 208V three phase change the rating, and sometimes the part.
  • Match the load rating to the heater. Use the figure for your voltage and group count, not the headline number.
  • Check for an extension unit. The largest heaters need one wired in beside the control.
  • Decide on WiFi now. Find out whether remote start is included, and whether your network reaches the power unit.
  • Mark three positions. Power unit, panel and sensor, with the cable routes between them.

Bring the heater's model number and a photo of your electrical panel's label when you call. That settles most of these in one conversation.

Who buys these

Who Buys a Separate Sauna Control

Building a room from scratch

Choose the heater first, then the control its maker pairs with it, then the three positions. The circuit, conduit and sensor cable cost less to place before the walls close. Shop Pay Installments are offered at checkout; see financing.

Adding app start out back

Remote start matters most when the sauna sits across a cold yard. Check the WiFi signal where the power unit will hang, and plan a cover if it goes outdoors. Still choosing the room itself? Browse outdoor saunas.

Gym, spa or rental

Check the panel for 208V three phase first. Public saunas carry extra rules: one maker requires a separate approved timer, and another says a heater run past its timer must be supervised. Ask your inspector what local code adds.

Staff picks

Four Sauna Controls, One for Each Common Setup

One for each common situation, each from a heater maker's own control line. See the heaters they pair with under Harvia sauna heaters and HUUM sauna heaters. Every Saunum heater runs from the Saunum AirIQ Wi-Fi.

Most 240V home heaters

Harvia Xenio CX45 with WiFi

Rated in Harvia's US manual for 10.8 kW at 240V single phase on one group, 15 kW at 208V three phase and 17 kW across two groups. That covers the 8 and 9 kW heaters common in home rooms, which the smaller CX30 can't carry at 240V on one group.

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Any HUUM electric heater

HUUM UKU Wi-Fi

HUUM's matched control. The main module runs any HUUM electric heater up to 11 kW, and the HIVE 12, 15 and 18 add the UKU extension box. The HUUM app is included; it joins 2.4 GHz WiFi only, and remote start asks for a safety confirmation at the panel first.

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KIP W heaters

Harvia Xenio CX170 with WiFi, 240V

The control Harvia specifies for the KIP45W, KIP60W and KIP80W, which have no controls of their own. It's sold as separate 240V single phase and 208V three phase versions, so order the one that matches your panel.

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Steam and dry heat

Harvia Fenix FX30C Combi, 240V

Runs a combination heater's steamer, up to 2.1 kW, as well as its elements: 12.7 kW at 240V on two groups in Harvia's Combi manual. WiFi is built in. App monitoring is free, and remote start runs on a three-month trial, then needs the one-time MyHarvia Control Upgrade.

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Which control fits which heater

Load ratings from each maker's US manual where one is published. Pairings from our heater pages; confirm on the heater page before you order.

Swipe the table to see every column.

Control Supply Rated heater load Paired with
Xenio CX30, Fenix FX30 One unit, 240V or 208V 7 kW at 240V, 10.5 kW at 208V, 11 kW two groups 6 kW E heaters, e.g. Cilindro PC60E
Xenio CX45, Fenix FX45 One unit, 240V or 208V 10.8 kW at 240V, 15 kW at 208V, 17 kW two groups Larger E heaters, e.g. Cilindro PC90E
Xenio CX170 Separate 240V and 208V units Matched to the KIP W range KIP45W, KIP60W, KIP80W
Xenio CX30C, Fenix FX30C Combi Separate 240V and 208V units 12.7 kW two groups at 240V, 10.8 kW at 208V, plus 2.1 kW steamer Virta Combi HL80SA, HL90SA, HL110SA at 240V; HL110SA at 208V
LTY45 power extension Wired with a CX30 or CX45 Adds capacity; not a control Virta Pro HL160E, HL200E
HUUM UKU Local or Wi-Fi 240V or 208V single phase Up to 11 kW on the main module Every HUUM electric heater
HUUM UKU Extension Box Wired with a UKU Adds capacity above 11 kW; not a control HIVE 12, 15, 18
Saunum AirIQ Wi-Fi 240V single phase Heaters up to 15.2 kW, per the current US manual Every Saunum Air, Air L and Air Perfect heater

App access differs by line. The Xenio WiFi models and the UKU Wi-Fi work with their makers' apps. The Fenix panels come with free app monitoring and a three-month trial of remote start, then the one-time MyHarvia Control Upgrade. The UKU Local can add WiFi later through a paid upgrade in the HUUM app. Spare UKU panels, sensors, cables and the Wi-Fi module are on our HUUM parts and accessories page.

Commercial

Commercial Sauna Controls, Quoted with the Heater

For a gym, spa, hotel or rental, we quote the heater, its control and any extension unit together, working from your drawings and panel schedule. One maker sets shorter warranty terms for commercial use, so we confirm cover before you order. For complete rooms, see commercial saunas.

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Questions answered

Sauna Controls: Frequently Asked Questions

What does a sauna control do?

It sets the temperature and the session timer and switches the heater on and off. Most have two parts: a panel you touch and a power unit, usually outside the hot room, that carries the heater's current. A temperature sensor above the heater tells it when to cycle. Many also switch a sauna light or a fan, and WiFi models add an app.

Does every sauna heater need a separate control?

No. Some heaters carry the timer and thermostat on the body, mostly smaller models, so larger rooms usually need a separate control. Many others ship with no controls and won't run until a separate control is wired in. The heater's model code and product page tell you which you have. Read it before comparing prices, because a heater that needs a control is really two purchases.

Does a wood-burning sauna stove need a control?

No. A wood-burning stove has no elements to switch and no circuit to protect, so there is nothing for a control to do. You manage the heat with the fire and the amount of wood you feed it. If you want a sauna with no heavy electrical work at all, compare wood-burning sauna stoves. Everything else on this page applies to electric heaters.

How do I know which control fits my heater?

Start with the heater's maker and model, then its output at your supply voltage. Each control publishes a maximum heater load for the supply it runs on. Some list separate figures for 240V single phase and 208V three phase, and some add one for a heater wired as two groups. Choose one rated at or above your heater on the terms that apply to you. Our heater pages name the control each maker pairs with that model.

Can I use a control from a different brand than my heater?

We don't recommend it without the heater maker's approval. At least one heater's safety listing names the control it was evaluated with, and a mismatch can leave an inspector or a warranty claim with questions. One heater maker's manual allows any certified control panel with a timer function, but the sensor type, its position and the load rating still have to suit that heater. Ask us before you mix makers.

Can I keep my old control when I replace the heater?

Sometimes. Check the old control's load rating at your voltage against the new heater's output, because a larger heater can outgrow a control that suited the old one. Sensors and cables have also changed between product generations on some lines. Give us the model number on the old power unit and the heater you're considering, and we'll tell you whether it carries over.

What's the difference between a WiFi sauna controller and a local one?

A local control runs everything from the panel by the sauna. A WiFi controller adds an app, so you can watch the temperature and, depending on the unit, start the heater from away. One maker includes remote start with its WiFi control. Another sells it as a one-time upgrade after a three-month trial on its newest panels. One local panel can add WiFi later through a paid upgrade in its app.

Is it safe to start a sauna heater remotely?

Only within the conditions each manual sets. A heater must not start with anything on the stones, so remote start comes with checks. One maker requires the room and the heater's surroundings to be checked before remote or pre-timed standby. Another requires a door sensor and a confirmation on the panel, and cancels remote start if the door opens. That manual warns that switching the confirmation off risks serious injury.

What temperature can a sauna control be set to?

Setting ranges differ by control: some run from 104 to 194 degrees Fahrenheit and others from 104 to 230. The residential code calls for a thermostat that limits the room to 194 degrees where that code is adopted, and your inspector applies the edition your area uses. Check the setting range on the product page against your local rules.

Do I need an electrician to install a sauna control?

Yes. Sauna controls that switch the heater's current are hardwired, and their manuals call for a licensed or qualified electrician. Their makers' warranty terms also ask for proof of that work with a claim, so keep the invoice. Your electrician sizes the circuit and breaker to the code your area has adopted, and one maker's control manual lists a maximum breaker and minimum wire size for each unit.

How do I know I'm buying sauna controls from an authorized dealer?

We're a factory-authorized dealer for every brand we carry. As a factory-authorized dealer, we sell each control with its manufacturer's warranty, on the terms each brand's own policy sets out. Those terms ask for installation by a licensed or qualified electrician. If you want the pairing checked before you order, call (888) 500-5675 with the heater's model number.

Related

Browse Related Categories

All sauna heatersSizing, stones and running cost Electric sauna heatersAmperage, wire size and circuits Sauna heater packagesHeater, control and stones on one order Traditional saunasRooms built around a stone heater

Tell us the heater and the supply

Send the heater's model number and whether your panel is single or three phase. We'll tell you which control carries it, whether it needs an extension unit, and what your electrician should plan for.

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