The Mill CO1500MAXWIFI3 is a 1500W portable convection heater intended for rooms under 22 m². Its curved white front, freestanding foot and compact footprint make it a flexible option when a living area, bedroom or home office needs additional heat. Mill uses an X-aluminium heating element with a stated maximum surface temperature of 62°C, plus silent operation and an easy-to-read LED display.

WiFi control through the Mill App lets you manage temperature and schedules remotely. Mill PID Wattage Tech reduces output as the target temperature is reached for steadier control, while Predictive Heating can learn room behaviour to help meet scheduled temperatures. Open Window Function responds to sudden temperature drops. The model is IPX4 rated and includes overheat protection, child safety lock and commercial lock, giving it a strong set of practical control and safety features.

1500W portable smart heating with WiFi control, PID power regulation, Predictive Heating and IPX4 protection.

Ideal For

Key Features

More controlled power delivery

Mill PID Wattage Tech can lower the heater’s power level as the set temperature is reached, reducing the on-off cycling associated with simpler controls. The LED display provides a clear local readout.

Scheduling that adapts to the room

Predictive Heating learns how quickly the room heats and cools, helping the heater start in time for a scheduled target. Open Window Function adds an automatic response to sudden temperature drops.

Connected and bathroom rated

Bluetooth assists initial WiFi setup, after which the Mill App handles remote control and schedules. Mill rates the CO1500MAXWIFI3 to IPX4 and specifies overheat protection plus locking functions.

How It Compares

Compared with the 1200W CO1200WIFI3, this Max model increases output to 1500W, is recommended for a larger room area under 22 m² and adds Mill PID Wattage Tech plus an IPX4 rating.

The Verdict