The Harvia Xenio CX45-U1-U3-XW is the higher-capacity Xenio control unit with built-in WiFi for the Club, Spirit, Cilindro, Virta, and Virta Pro series Harvia sauna heaters. It handles single-phase loads up to 17kW and three-phase loads up to 15kW - the correct control for Harvia's larger and commercial-grade heaters that exceed the CX30's capacity. The XW in the model name designates built-in WiFi: unlike the standard CX45 which requires the separate CX004WIFI panel to add app connectivity, the CX45-U1-U3-XW has WiFi integrated directly into the control unit. Touch panel control of temperature, time, lighting, and fan is available locally; the MyHarvia app on iOS or Android provides the same control remotely from anywhere. The CX45-U1-U3-XW is not compatible with Virta Combi heaters, KIP series, The Wall series, or Vega series heaters.
CX45 vs CX30 - higher load capacity for larger heaters
The Harvia Xenio control family has two capacity tiers. The CX30 handles heaters up to 10.5kW on single-phase and is the correct control for KIP, Spirit 6kW, Cilindro 6kW, and Virta 6kW installations. The CX45 handles heaters up to 17kW on single-phase and 15kW on three-phase - the correct control for Spirit 8kW, Cilindro 8/9/10.5kW, Virta 8/9/10.5/16/20kW, Club 10/12.5/15kW, and Virta Pro 16/20kW installations. Both the CX30 and CX45 use the same Xenio touch control panel interface and the same MyHarvia app; the power unit inside the CX45 is rated for the higher current draw of the larger heaters. Using a CX30 with a heater that requires a CX45 will result in incorrect operation and potential damage. Confirm the heater's required control unit before purchasing by checking the heater's installation manual or the compatibility note below.
Built-in WiFi and MyHarvia app - the XW advantage
The standard CX45 (without XW suffix) requires the CX004WIFI add-on panel to enable WiFi and MyHarvia app control. The CX45-U1-U3-XW has WiFi built in - no separate panel purchase, no additional mounting position. The same MyHarvia app functions available with the CX004WIFI are available directly through the CX45-U1-U3-XW: remote on/off, temperature control, lighting and fan management, timed start, week timer scheduling, live session monitoring, and FOTA automatic firmware updates over WiFi. The CX45-U1-U3-XW covers both single-phase (U1) and three-phase (U3) wiring configurations in a single unit, with the voltage and phase configuration set at installation.
Touch panel, surface or flush mount, inside or outside the sauna
The CX45-U1-U3-XW touch control panel measures 3.4"W x 1.0"D x 4.4"H and can be installed as a surface mount or embedded flush into the wall. It can be positioned inside the sauna room at the correct safety distance from the heater (maximum 1 meter / 39" from floor if inside the sauna), in the changing room, or in any adjacent room - the same installation flexibility as the CX30 and CX004WIFI panels. The touch panel operates in the 104-194°F (40-90°C) temperature range with a maximum humidity of 99% non-condensing, making it suitable for in-sauna installation at the specified safety distances. A data cable connects the control panel to the power unit, which mounts in the electrical service area outside the sauna room.
Higher-capacity Xenio digital control unit with built-in WiFi for Club, Spirit, Cilindro, Virta, and Virta Pro series Harvia heaters. Up to 17kW single-phase / 15kW three-phase. Built-in WiFi - no separate CX004WIFI panel needed. MyHarvia app - iOS and Android - remote on/off, temperature, lighting, fan, timed start, week timer, FOTA firmware updates. Touch control panel. Covers U1 (single-phase) and U3 (three-phase) installations. Surface or flush mount. Installs inside or outside sauna room. 3.4"W x 1.0"D x 4.4"H. Not compatible with Combi, KIP, The Wall, or Vega heaters. ETL Listed. 1-year warranty. Made by Harvia, Finland.
Built-in WiFi - no separate WiFi panel needed Up to 17kW single-phase / 15kW three-phase Club, Spirit, Cilindro, Virta, Virta Pro series Covers U1 (1PH) and U3 (3PH) installations MyHarvia app - iOS and Android Remote on/off and temperature control Timed start and week timer FOTA automatic firmware updates Touch control panel - 3.4" x 1.0" x 4.4" Surface or flush wall mount Inside or outside sauna room Not compatible with Combi, KIP, The Wall, or Vega ETL Listed 1-year warranty
Specifications
Electrical and capacity
| Supply voltage |
240V / 1-phase (U1) or 208V / 3-phase (U3) |
| Maximum load - single phase |
17 kW |
| Maximum load - three phase |
15 kW |
| Certification |
ETL Listed |
Compatibility
| Spirit series |
8kW (CX45 required) |
| Cilindro series |
8kW, 9kW, 10.5kW |
| Virta series |
8kW, 9kW, 10.5kW, 16kW, 20kW |
| Club series |
10kW, 12.5kW, 15kW |
| Virta Pro series |
16kW, 20kW |
| NOT compatible with |
Combi (use CX30C), KIP (use CX30), The Wall (built-in), Vega (built-in/Xenio WiFi) |
Physical
| Dimensions (W x D x H) |
3.4" x 1.0" x 4.4" (86 x 25 x 112 mm) |
| Installation options |
Surface mount or flush wall mount |
| Location |
Inside sauna (max 39"/1m from floor) or outside |
| Operating temperature |
104-194°F (40-90°C) |
| Max humidity |
99% non-condensing |
MyHarvia app functions
| App availability |
iOS (App Store) and Android (Google Play) - free |
| Heater control |
Remote on/off |
| Temperature range |
104-194°F (40-90°C) |
| Lighting and fan control |
Yes - on/off from app |
| Timed start |
Schedule sauna to be ready at a specific time |
| Week timer |
Regular recurring sauna schedule |
| Status monitoring |
Temperature, heating time, heater state |
| Firmware updates |
FOTA - automatic over WiFi |
CX30 vs CX45 - which do I need?
| CX30 (up to 10.5kW / 1PH) |
Spirit 6kW, Cilindro 6kW, Virta 6kW, KIP series |
| CX45 (up to 17kW / 1PH) |
Spirit 8kW, Cilindro 8-10.5kW, Virta 8-20kW, Club 10-15kW, Virta Pro 16-20kW |
| CX30C (Combi) |
Virta Combi HL80SA, HL90SA, HL110SA only |
Warranty
| Warranty period |
1 year from date of purchase |
| SKU |
CX45-U1-U3-XW |
| Origin |
Harvia - Finland |
What's included
Xenio CX45-U1-U3-XW digital control panel with built-in WiFi
Power unit
Data cable
Temperature sensor
Installation and operation manual
Free: MyHarvia mobile app - download from App Store or Google Play. Requires: Compatible Harvia heater (Club, Spirit, Cilindro, Virta, or Virta Pro series - not included). A licensed electrician is required for all electrical connections.
Why the Harvia Xenio CX45-U1-U3-XW stands out
Built-in WiFi - complete in one unit
The XW suffix means WiFi is integrated directly into the CX45 control unit. The standard CX45 requires the separate CX004WIFI panel to add app control, adding cost and an additional mounting position. The CX45-U1-U3-XW delivers the full MyHarvia app experience - remote preheat, scheduling, monitoring, and FOTA updates - without any additional hardware purchase.
Up to 17kW - the high-capacity Xenio
The CX45 handles single-phase loads up to 17kW and three-phase loads up to 15kW - the power tier required for Cilindro 8-10.5kW, Virta 8-20kW, Club 10-15kW, and Virta Pro 16-20kW installations. The CX30 maxes out at 10.5kW; any Harvia heater above this requires the CX45. Using the wrong capacity control unit risks incorrect operation and potential warranty issues.
Covers U1 and U3 in one SKU
The CX45-U1-U3-XW covers both single-phase (U1, 240V) and three-phase (U3, 208V) wiring configurations. For commercial sauna installations on three-phase power, the same control unit is used with the appropriate three-phase wiring configuration as described in the IOM. No separate U3-specific SKU is needed.
Remote preheat from anywhere
Turn the sauna on from the MyHarvia app before leaving the office or from the couch. Schedule timed starts for regular sauna sessions, or set a week timer to have the sauna ready every Saturday morning automatically. For commercial installations, the remote monitoring capability lets a facility manager check sauna status across multiple units without physically visiting each room.
FOTA automatic firmware updates
The CX45-U1-U3-XW receives firmware updates automatically over WiFi when connected to the MyHarvia network. No manual update process or USB connections. The control software stays current with the latest Harvia improvements as they are released, without any action required from the owner or facility manager.
Inside or outside sauna room
The 3.4"W x 1.0"D x 4.4"H panel installs as a surface mount or flush-mount and can be positioned inside the sauna room at the correct safety distance from the heater (maximum 1m from floor), in the changing room, or in any adjacent room. The touch panel operates across the full sauna temperature and humidity range at the correct safety distances.
About Harvia
Harvia - Finland - ETL Listed
Harvia Xenio CX45-U1-U3-XW. Higher-capacity Xenio with built-in WiFi for the Club, Spirit, Cilindro, Virta, and Virta Pro series.
Harvia is a Finnish sauna and spa company with over 70 years of manufacturing history. The CX45-U1-U3-XW is the higher-load capacity Xenio control with integrated WiFi - the correct choice for Harvia heaters from 8kW through 20kW in the Club, Spirit, Cilindro, Virta, and Virta Pro series. The built-in WiFi eliminates the need for a separate CX004WIFI add-on panel, providing the complete MyHarvia app experience in a single control unit purchase. Verify the required control for the specific heater model using the heater's installation manual before ordering. We are an authorized Harvia dealer.
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Built-in WiFi - no separate CX004WIFI panel needed
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Up to 17kW/1PH or 15kW/3PH - for larger Harvia heater series
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Compatible: Club, Spirit 8kW, Cilindro 8-10.5kW, Virta 8-20kW, Virta Pro
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Not compatible: Combi (CX30C required), KIP, The Wall, Vega
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MyHarvia app - remote preheat, scheduling, FOTA - ETL Listed - 1-year warranty
Manuals and Documents
Warranty
1-year limited warranty
The Harvia Xenio CX45-U1-U3-XW is covered by a 1-year limited warranty from the date of purchase. The warranty covers defects in manufacturing and materials under normal use conditions. The warranty does not cover damage caused by improper installation, use with non-compatible heaters, or failure to follow the installation guidelines in the IOM. A licensed electrician is required for all electrical connections. Proof of purchase from an authorized Harvia dealer is required for warranty claims. We are an authorized Harvia dealer.