The Mill Invisible Smart WiFi PA700WIFI4 is a compact 700W Gen 4 wall-mounted panel heater recommended for rooms of 9–12 m². Its white steel front and slim profile suit smaller bedrooms, offices and other spaces where floor area is at a premium. The X-aluminium heating element is designed for fast, even and silent heat, while Mill PID Wattage Tech can lower output as the target temperature is approached for steadier control.

WiFi, Zigbee 3.0 and the Mill App provide connected operation, with Bluetooth 5.2 assisting setup and Matter compatibility for supported smart-home ecosystems. Predictive Heating can learn how the room warms and cools to help reach scheduled targets, and Open Window Function reacts to a sudden temperature drop. Mill rates the heater IPX4 and specifies overheat protection, child safety lock and commercial lock. The supplier EAN should be verified because current exact-model listings show a different GTIN.

Compact 700W Gen 4 wall-mounted smart heating with WiFi, Zigbee, Matter support, PID control and IPX4 protection.

Ideal For

Key Features

Compact Gen 4 panel heating

At 700W, this model is designed for smaller spaces while keeping the same connected platform as larger Gen 4 Mill panels. The wall-mounted format helps preserve usable floor area.

Smarter temperature control

Mill PID Wattage Tech modulates output close to the target temperature. Predictive Heating learns how the room changes temperature over time so schedules can be reached more accurately.

Connected across WiFi, Zigbee and Matter

The heater supports WiFi, Zigbee 3.0 and the Mill App, with Bluetooth 5.2 for setup. Matter compatibility enables supported smart-home integrations, and Mill also lists Homey and Tibber.

How It Compares

Compared with the PA1300WIFI4, this model keeps the same Gen 4 connectivity, PID control and IPX4 rating but uses a lower 700W output and is recommended for smaller 9–12 m² rooms.

The Verdict