HUUM UKU 4.2 Mirror Wi-Fi Sauna Heater Control with Mobile App

HUUM UKU 4.2 Mirror Wi-Fi Sauna Heater Control with Mobile App

The HUUM UKU 4.2 Mirror pairs the current-generation UKU 4.2 Wi-Fi control system with a mirrored glass panel. The panel can be recessed into the sauna wall or surface-mounted with the HUUM surface frame, and it can live inside the sauna room. Heat the sauna from the panel or from the HUUM mobile app, with the 4.2's two-sensor safety, single heat-rated cable and upgraded door sensor kit.

Features

• Mirrored glass control panel, recessed or surface-mounted (surface frame sold separately)
• Panel can be installed inside the sauna room, away from the heater
• Control from the wall panel or the HUUM mobile app, from anywhere
• Settable on/off, time, temperature and delayed start (up to 48 hours ahead)
• Heating-time presets of 1, 3, 6, 12 and 18 hours
• Temperature range 104–230°F (40–110°C)
• Displays set temperature and current sauna temperature
• Safety sensor mounts directly above the heater and handles overheat protection
• Bench sensor (optional) measures temperature and humidity at bench level, where you actually sit
• Door sensor kit stops the heater if the sauna door is left open
• One heat-resistant cable, rated to 401°F (205°C), serves the control panel, sensors and door sensor
• Controls sauna lights, ventilation and a steamer from the same system
• Overheat protection and child safety lock
• For heaters up to 11 kW direct; 12–18 kW with the UKU Extension Box
• Designed, engineered and made in Estonia
• 3-year limited residential warranty, 1-year limited commercial warranty

What's Included

• Control panel
• Main module
• Safety sensor
• Bench sensor
• 2 × sensor housing
• Door sensor kit
• Temperature-resistant cable
• Installation and operation manual

Specifications

• Temperature range: 104–230°F (40–110°C)
• Heater capacity: up to 11 kW direct, up to 18 kW with UKU Extension Box (sold separately)
• Power supply: 208/240 V, single phase
• Main module: 6⅞ × 9⅞ × 3 in (175 × 250 × 75 mm), installs outside the sauna room; weatherproof enclosure required outdoors
• Control panel cable: up to 50 ft (15 m)
• Sensor cables: up to 50 ft (15 m)
• Wi-Fi: 2.4 GHz networks (5 GHz and 6 GHz not supported)
• Mobile app: HUUM app for iOS and Android
• Warranty: 3-year limited residential, 1-year limited commercial

Technical Info

HUUM UKU 4.2 Installation and Operation Manual (PDF)

Frequently Asked Questions

Can the mirror panel go inside the sauna?
Yes. Mount it away from the heater with its top edge no higher than 40 inches from the floor and at least 20 inches from any exhaust vent. Recess it into a 65 × 105 × 27 mm wall cutout, or surface-mount it with the HUUM UKU surface frame (sold separately).

What changed from the previous UKU to the UKU 4.2?
The UKU 4.2 replaces the single temperature sensor with two: a safety sensor above the heater that handles overheat protection, and an optional bench sensor that reads temperature and humidity where you sit. It also ships with one heat-resistant cable for the panel, sensors and door sensor, and an upgraded door sensor kit.

Which heaters does the UKU 4.2 work with?
Any HUUM electric sauna heater up to 11 kW connects directly. For 12 to 18 kW heaters, add the HUUM UKU Extension Box.

Do I have to install both sensors?
The safety sensor is required. The bench sensor is optional, but with it installed the panel shows the real bench-level temperature and allows a maximum setting of 194°F; with the safety sensor alone the maximum is 230°F.

Where does the main module go?
Outside the sauna room, mounted upright on a wall. If it is outdoors it needs a weatherproof enclosure. The module runs down to -40°F, and the cable to the control panel can be up to 50 feet.

Does the Wi-Fi need anything special?
A 2.4 GHz Wi-Fi network at the sauna. The HUUM app then lets you start, schedule and monitor the sauna from anywhere.

Can it run my sauna lights or a steamer?
Yes. The main module has outputs for lights, ventilation and a steamer, all controlled from the panel or the app.