Mill Invisible Smart WiFi Panel Heater – Smart, stylish and efficient heater. Easy self-assembly.

The award-winning Mill Invisible Smart WiFi Panel Heater combines cutting-edge smart heating technology with the clean lines of Scandinavian design. With its elegant curved front panel, it blends perfectly into any space - a discreet yet powerful heat source that complements your interior.

Energy-saving comfort

This new generation heater is the ideal plug-and-play alternative or complement to central heating. Surprisingly energy-efficient, it provides pleasant warmth that evenly warms the room without unnecessary energy consumption. It operates quietly and efficiently, creating a calm and harmonious atmosphere - perfect for bedrooms, living rooms or bathrooms (IPX4).

Designed with safety and family use in mind, the heater maintains a low surface temperature, making it safe for children and pets. Its ultra-slim profile is discreet while delivering impressive performance – safe for use at night or when you’re away.

Mill's smart features include:

• Mill Predictive Heating™ – learns your home’s habits and starts heating in time so your space is always ready.

• Mill PID Wattage Tech™ – optimizes heater power for stable temperature and reduced energy consumption.

• Wattage Cap – allows you to set a maximum power to prevent excessive consumption.

• Open window detection – automatically pauses heating when the temperature drops suddenly.

These innovations ensure optimal comfort with up to 30% energy savings compared to conventional heaters.

Connected and future-proof

Mill is designed to seamlessly integrate with your smart home. It supports:

• Matter (Google Home, Amazon Alexa, Apple HomeKit)

• Zigbee 3.0

• Homey

It is one of the most advanced smart heating solutions on the market.

• Designed in Norway

• 5-year warranty

• Smart, safe and aesthetically pleasing

Mill Invisible – A smart way to heat your home efficiently and stylishly.

Same summary

The MILL PA400WIFI4 panel convection radiator, with its 400 W power, is particularly suitable for heating smaller rooms, where the need for a quick temperature increase and easy control is crucial. Thanks to the built-in thermostat and Wi-Fi connectivity, it can provide more flexible heating management and relatively economical energy use. The model is not the best choice as the only heating source for larger rooms; in such cases, it may be more suitable as an additional or occasional source of heat. The advantage of this radiator is its quiet operation and the possibility of remote control, which allows more freedom in everyday use.

Recommendation source: Enaa guides and team experiences.

User view

This radiator is most often chosen by users who want to heat their offices, smaller bedrooms or work spaces more easily and quickly, where compactness and discreet operation are highly desirable. The practicality of the Wi-Fi control option provides an additional sense of remote control, which is often appreciated in modern and technologically advanced households. In the daily routine, it works well if you want to maintain a constant temperature in a room where you spend a long time, for example when working from home or reading in the evening.

When purchasing a radiator, users often pay attention to the wider range of products from the Mill brand, which is renowned for its elegant design and focus on user experience.

Why buy at Enaa

The selected product can be selected with clear filters that make it easier to find the right radiator according to the needs of the room, and you can also compare the technical features of different models in the same category before purchasing. Enaa ensures a simple and transparent selection process and makes it easier to compare offers in one place.

Answers to frequently asked questions

What size room is a 400 W radiator suitable for?

A 400 W radiator is usually suitable for heating smaller spaces, such as smaller bedrooms or offices, or as an additional source of heat in medium-sized rooms.

Can I use the MILL panel radiator in the bathroom?

Use in the bathroom is only possible if it is a properly protected model for moisture; this radiator is not recommended for use directly in a humid room without additional protection.

What does Wi-Fi control mean for this radiator?

The Wi-Fi function allows you to control the radiator remotely via a mobile app or smartphone, which is convenient for adjusting the temperature even when you are not at home.

Is the radiator running quietly?

Panel convection radiators, such as the MILL PA400WIFI4, operate quietly and are therefore also suitable for rooms where peace is important, such as bedrooms or offices.

Description updated: April 2026