Electric Sauna Wiring and Controls Guide: HUUM vs Harvia vs SaunaCraft.

Why Sauna Electrical Work Is More Nuanced Than People Think

A quality sauna install is not just about the heater kilowatts. The heater, controller family, sensor placement, disconnecting means, wiring route, lighting plan, and user habits all shape the job. That is why two saunas with the same heater rating can have very different electrical scopes.

This article is written for homeowners and project planners, not for DIY installation. The point is to understand the differences between common control approaches and how those choices affect the electrical design.

The Three Main Control Approaches

1. Built-in controls

Some sauna heaters use integrated controls on or within the heater. This can simplify the visible user interface and reduce the amount of separate wall hardware, but it can also limit where the user interacts with the system and how cleanly accessories such as lighting or remote features are integrated.

2. Auxiliary wall-mounted controls

These systems separate the heater from the control interface. The user adjusts temperature and timing from a separate panel or control unit. This approach can be cleaner for user experience and often works better when the heater location is not ideal for operating controls directly.

3. WiFi or remote-enabled controls

These systems add app-based or network-enabled functionality. For the right client, they are excellent. For the wrong client, they are unnecessary complexity. The right answer depends on how the sauna will actually be used.

HUUM: Strong Fit for Design-Driven and Remote-Control Projects

HUUM’s UKU control family is one of the strongest options when the client wants a modern control experience and remote capability. On HUUM’s official UKU WiFi page, the company says the system allows heating from the control panel on site or from a mobile phone, and that the app can set the start and end time of heating, target temperature, and provide notification when the sauna is ready. HUUM also states that lighting, ventilation, and a steamer can be connected to the control system, and that the package includes a temperature sensor and door sensor.

That matters because HUUM is not just selling a pretty control panel. It is selling a control architecture that is clearly designed around remote use and accessory integration. HUUM also differentiates between UKU Local and UKU WiFi. Local is for on-site control only. WiFi adds phone-based control. That gives the electrician and homeowner a clean decision tree.

The caution with HUUM is simple. It is a better fit for clients who will actually use the smarter features and who are comfortable with a more premium control ecosystem. If the owner only wants a basic heat-and-go sauna, HUUM can be more system than they need.

Harvia: Broad Ecosystem and Strong Accessory Integration

Harvia’s control ecosystem is broad, which is one of its biggest strengths. Harvia’s own control overview explains that a modern sauna control system is made up of the control panel, the power unit, and the temperature sensor. The company is also explicit that its controls can manage more than just heat. Harvia materials describe temperature adjustment, timers, lighting control, ventilation control, and in WiFi-enabled variants, app-based remote operation.

For example, Harvia’s Xenio WiFi remote kit says the MyHarvia mobile application can control functions such as temperature and humidity, lighting and air ventilation, temperature calibration, timed starting, and week timer functions. Harvia also highlights door-sensor based safe remote starting. Newer Fenix products go even further, positioning the platform as a more premium intelligent interface that can control the heater, lighting, and ventilation.

Harvia is often the easiest brand to match to different customer expectations because the ecosystem ranges from simpler controls to more feature-rich WiFi options. That flexibility is useful when the project is being designed around both sauna performance and the finished look of the room.

SaunaCraft: Straightforward, Proven, and Canadian

SaunaCraft’s advantage is not flashy marketing. It is familiarity, Canadian presence, and straightforward heater/control combinations that make sense for a lot of traditional sauna projects. SaunaCraft says it has been focused on quality service and craftsmanship since 1962 and that its products are tested and approved for use in Canada and the USA.

On the controls side, SaunaCraft’s own site lists the TPT3 as a thermostat with a 60-minute timer and the EL-13 as an electronic thermostat and timer with touch-pad control. Importantly, SaunaCraft also states that the EL-13 does not include a light-switch feature. That one detail matters in real projects because it means lighting usually needs to be planned as a separate switching or smart-control decision rather than assumed to be built into the sauna control package.

For homeowners who want a straightforward electric sauna without app dependence, SaunaCraft can be a very practical fit. For homeowners chasing integrated remote features and broader accessory control, it may push the design toward separate lighting controls or a different control architecture.

Under-Bench Lighting, Smart Switches, and Controller Integration

Lighting is where a lot of sauna projects either feel polished or feel patched together. Some control systems can manage lighting directly. HUUM says its UKU WiFi system can connect sauna lighting. Harvia’s Xenio and Fenix materials also describe lighting control as part of the platform. SaunaCraft’s EL-13 specifically says the light-switch feature is not available, which usually means separate switching must be planned.

In practice, there are three common approaches.

·       Simple separate wall switch outside the sauna.

·       Smart switch or smart relay controlling sauna-rated lighting outside the hot zone.

·       Lighting integrated into the heater control ecosystem where the selected control platform supports it.

The best choice depends on the client. Some owners want a basic reliable exterior switch. Others want scenes, automation, or remote control. What should never happen is treating the lighting as an afterthought after the walls are finished. Sauna lighting should be planned early, especially if under-bench lighting, dimming, or app integration is part of the vision.

The Real Electrical Questions That Decide the Job

·       Is the existing service and panel capacity adequate for the selected heater?

·       Will the control system be local, auxiliary wall-mounted, or WiFi-enabled?

·       Where will the controller, power unit, and sensors be located?

·       Will the project include under-bench lighting, exterior lighting control, or ventilation integration?

·       Is the homeowner prioritizing simplicity, aesthetics, or remote functionality?

·       Does the final design still allow a clean, serviceable disconnecting means and wiring route?

Those questions matter more than brand loyalty. A bad control choice can make a good heater annoying to use. A good control choice can make the whole sauna feel premium.

Which Brand Is Best?

There is no universal winner.

Choose HUUM when:

·       The client values a premium look and modern remote control.

·       Lighting, ventilation, or steamer integration matters.

·       The homeowner will actually use app-based functionality.

Choose Harvia when:

·       You want a broad control ecosystem with strong upgrade paths.

·       You want lighting and ventilation control within a mature product family.

·       You need flexibility from mid-range to premium solutions.

Choose SaunaCraft when:

·       You want a more traditional, straightforward setup.

·       Canadian sourcing and familiarity matter.

·       The client values reliability more than remote features.

The wrong way to choose is by picking whichever heater is cheapest online. The right way is to match the heater and controller to how the sauna will actually be used.

Final Word

A well-executed sauna project is a design-and-electrical coordination job. Heater size matters, but so do controls, lighting, disconnect placement, wiring route, and user habits. HUUM shines when remote control and premium integration matter. Harvia offers one of the broadest and most adaptable ecosystems. SaunaCraft remains a solid Canadian-made option for clients who want a more traditional and straightforward setup.

If you are planning an electric sauna in Ottawa, Ontario or Gatineau Quebec region, Symmetry Electric can review the heater and controller options, explain how they affect the wiring scope, and help you choose a setup that works in real life rather than just looking good in a brochure.