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  • Harvia Fenix FX45 Smart Wi-Fi Sauna Control (FX45-U1-U3-XC) — product photo
  • Harvia Fenix FX45 Smart Wi-Fi Sauna Control (FX45-U1-U3-XC) — installed in a sauna
  • Harvia Fenix FX45 Smart Wi-Fi Sauna Control (FX45-U1-U3-XC) — installed in a sauna
  • Harvia Fenix FX45 Smart Wi-Fi Sauna Control (FX45-U1-U3-XC) — installed in a sauna

Harvia Sauna control

Harvia Fenix FX45 Smart Wi-Fi Sauna Control (FX45-U1-U3-XC)

Harvia's touch-screen control kit, with a 4.3-inch glass panel, a power unit and a heater sensor. It connects to the MyHarvia 2 app and runs Harvia heaters up to 10.8 kW on one 240 V circuit, or 17 kW on two.

Works with Harvia heaters only. See the 5 heater series and sizes it fits

One kit: Fenix panel, power unit and sensor, for 240 V single-phase or 208 V three-phase.

What’s included

  • Fenix 4.3-inch glass touch-screen control panel
  • Power unit, which mounts outside the sauna room
  • Heater temperature sensor with 4 m cable
  • 5 m panel cable (RJ10)
  • Screws and installation instructions

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Questions about compatibility or wiring? Email info@lakeshoresaunas.ca Send a message Mon–Fri 9 am–6 pm, Sat 10 am–4 pm ET

Works with

The Harvia heaters and sizes Harvia rates this sauna control for.

Overview

About this sauna control

The Fenix puts a 4.3-inch glass touch screen on your sauna wall. Harvia says the panel resists heat and moisture, can be surface-mounted or recessed, and may be installed inside the sauna room. It sets the temperature and heating time and switches lights and a fan. Per Harvia, it also learns how your heater performs and adapts, and software updates arrive automatically over Wi-Fi.

The kit includes the panel, the power unit that switches the heater, a heater sensor with a 4 m cable and the panel cable, so no contactor box is needed. Harvia's manual rates the FX45 for 10.8 kW on a single 240 V circuit, 17 kW when the heater is fed as two groups on two circuits, and 15 kW on 208 V three-phase, and Harvia says its LTY45 power extension can raise that. The power unit belongs outside the hot room, somewhere dry. In the MyHarvia 2 app, monitoring and alerts are free; remote start is Harvia's optional one-time Control upgrade.

We match it to the Harvia Cilindro, Spirit and Virta from 8 to 10.5 kW and the Club 10 kW, and, with Harvia's LTY45, to the Virta Pro 20 kW on 208 V three-phase. For the Club 12.5 and 15 kW and the Virta Pro 16 kW, we match the Xenio CX45.

In Ontario, control and heater wiring is a job for a Licensed Electrical Contractor, or for you in your own home after filing an ESA notification (permit).

Questions about this sauna control

Is there a subscription for the app?

No, per Harvia. The MyHarvia 2 app's Core features, including status, temperature, remaining time and ready alerts, are free. Starting the sauna remotely needs Harvia's optional one-time Control upgrade, and Harvia includes a 3-month trial with new compatible products.

Can the Fenix panel go inside the sauna?

Yes, according to Harvia: the glass panel is built for heat and moisture. The power unit is different and has to stay outside the hot room, somewhere dry.

Can the Fenix run a bigger heater, like the 15 kW Club?

Harvia's manual rates the FX45 like the Xenio CX45: 10.8 kW at 240 V on one supply circuit, and 17 kW when the heater is fed as two groups on two circuits. For the Club 12.5 and 15 kW and the Virta Pro 16 kW, we supply the Xenio CX45. Tell us your heater and we'll confirm the combination before we invoice.

Can I use this control with a HUUM or Homecraft heater?

No. Sauna controls are brand-matched: each maker calibrates its temperature sensor differently and uses its own wiring and signals. Harvia heaters run on Harvia controls, HUUM on UKU, and Homecraft on Homecraft TKE controls.

Documents

Manuals from Harvia.

Documents are hosted by Harvia and can change without notice; your electrician or installer works from the manual that ships with the product. Need a document in another format? Ask us.

More Harvia controls