neoFlo – Smart Thermostatic Radiator Control

IMI Heatmiser neoFlo Smart Radiator thermostat on a victorian style radiator installed in a green room.

Old Radiators Can Learn New Tricks

Take control of your radiator heating with neoFlo – our advanced smart thermostatic radiator head.

neoFlo combines digital precision with quiet operation to deliver effortless comfort and energy efficiency — all at your fingertips.

From under floor to every floor

neoFlo integrates seamlessly with an existing neo controlled heating system bringing complete control to the rest of your home.*

Smarter Control, Room by Room

Connect to your boiler or hot water cylinder to create a smart radiator system and warm each room as you need it.**

Why Choose neoFlo?

Smart, Quiet Performance
Control from your device & enjoy comfortable temperatures without continuous noisy valve movements†
Up to 6-Year Battery Life
Long-lasting convenience with low maintenance
App & Voice Control
Adjust the temperature from anywhere with the neoApp or smart home assistants

Installer-Friendly Setup
No fuss installation with wireless control
Energy-Saving
Only heat the rooms you need, when you need them with digital accuracy

KEY FEATURES

Quiet Temperature Control
Hybrid technology merges over 60 years of valve control experience with advanced neo connectivity, providing up to 6 years battery lifetime, precise temperature control and quiet temperature management.
Save Energy & Money with Complete Control
Connecting neoFlo to the IMI Heatmiser neoApp via neoHub (3rd gen.) unlocks full remote control and advanced settings. Users can adjust temperatures from the app or directly on the neoFlo, with instant synchronization between both. Plus control through smart home platforms like Amazon Alexa, Google Assistant, or Apple HomeKit.

System balancing
Hydronic balancing done right. Depending on your building size use the thermal balancing function or couple neoFlo with the IMI Heimeier Eclipse radiator valve range.
From Underfloor to Every Floor
Using the neoHub 3rd generation enables radiator control for UFH and radiator hybrid heating systems, or paired with the IMI Heatmiser RF Switch can operate the boiler and call for heat room by room.

† Hybrid Control – Smarter, Quieter Heating
neoFlo uses a unique hybrid approach to temperature control. You’ll hear a gentle sound as the electronic motor adjusts the valve, then the ultra-quiet precision of a traditional TRV takes over. The result? Consistent comfort, quieter operation, and extended battery life.

The neoFlo Radiator Thermostat on angle from the left

MADE FOR EVERY SYSTEM

Fully compatible with the neoApp ecosystem.

*From under floor to every floor

Using the new neoHub Gen 3 and IMI Heatmiser RF Switch you can now expand an existing heating system to include radiators in a home. Using the same neoApp or existing home automation control, you can manage each radiator to compliment your comfort needs, save energy, and reduce the cost of heating your home.

**Smart Control Room by Room

Connecting to your boiler or hot water using the IMI Heatmiser RF Switch makes a conventional radiator system smart. Pairing with the neoHub Gen 3, and having the RF Switch added to your system by an installer means each radiator is not only fully programmable but can activate the boiler and warm up the room you want. Saving energy and reduce the cost of heating your home.

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STAND ALONE & CONNECTED NEOHUB FUNCTIONALITY

Stand-alone functions without neoHub

neoFlo can operate independently without the neoHub, providing essential heating control right from installation. The only requirement is calibrating the radiator valve, ensuring a quick and simple setup. This allows a valve to be set up immediately without relying on network availability.

Manual mode	Users can manually adjust the room temperature by pressing the button to activate the display. When display is activated turn the wheel to select the desired setpoint. The chosen temperature remains active until changed again or overridden by another mode.
Open window detection – Save energy automatically	If the room temperature drops sharply (>2°C in 2 minutes), neoFlo closes the valve for 30 minutes to prevent unnecessary heating. The open window icon appears on the display, and after 30 minutes, the system returns to the previous mode (Auto or Manual). Settings can be adjusted via the IMI Heatmiser neoApp.
Simple time scheduling – Efficient heating	You can set up to four daily heating periods with different temperatures directly on the neoFlo. This feature helps reduce energy consumption before connecting to neoHub for more advanced scheduling.
Boost mode – Quick heating when needed	Activating Boost mode fully opens the valve for 30 minutes, rapidly warming the room. A countdown appears on the display, and after 30 minutes, the system reverts to the programmed schedule. Users can cancel the Boost early by pressing the pair button.
Frost protection – Prevent freezing pipes	If the room temperature drops below 5°C, neoFlo automatically opens the valve to protect against freezing. The frost protection icon appears on the display.
Valve protection – Prevents limescale build-up	To maintain performance, neoFlo runs an automatic valve exercise cycle once a month, preventing limescale deposits that could affect operation.
Low battery indicator – Long-lasting power	A low battery icon appears when the battery needs replacement. Thanks to hybrid technology, battery life lasts approximately 5 to 6 years.

Enhanced-functions with neoHub Gen3 and IMI Heatmiser neoApp

Connecting the neoFlo to the IMI Heatmiser neoApp via the Gen 3 neoHub enables full remote control and access to advanced settings. Users can adjust temperatures either through the app or directly on the neoFlo, with instant synchronisation between the two.

Auto mode – Smart heating schedule	The neoFlo follows a heating profile based on predefined schedules. By default 5/2 mode (Mo–Fr/Sa–Su): Mo-Fr: 7:00 – 21°C 9:00 – 16°C 16:00 – 21°C 22:00 – 16°C Sa-Su: 9:00 – 21°C 22:00 – 16°C You can modify these settings only through the neoApp. Manual adjustments on the neoFlo remain active only until the next scheduled temperature change. Temperature adjustments range from 5°C to 30°C, in 0.5°C increments.
Holiday mode – Energy saving when away	You can set Holiday Mode via the IMI Heatmiser neoApp, switching all devices to frost protection until a specified return date. If needed, heating can be temporarily activated for 1 hour directly on the neoFlo.
Adaptive thermal balancing – Even heat distribution	Proper balancing ensures all radiators receive the right flow, improving energy efficiency and comfort. The neoFlo can be mounted on existing radiator valves and automatically adjusts flow to prevent uneven heating. In simple systems, thermal balancing may be sufficient, but for optimised performance, IMI Heimeier valves offer balancing solutions with static V-exact II and dynamic Eclipse TRV’s.
Boost mode – Quick heating on demand	Need fast heating Boost Mode fully opens the valve for 30 minutes, increasing room temperature quickly. After 30 minutes the system returns to the previous mode. You can cancel Boost mode early by pressing the pair button.
Temperature hold – Temporary adjustments	Users can set a specific temperature for a chosen duration outside the normal schedule. Once the hold time expires, the system reverts to the previous schedule or set temperature.
Open window detection – Customisable sensitivity	The IMI Heimeier neoApp allows you to adjust the sensitivity level (Low, Medium, or High) and the duration for which the valve remains closed after detecting an open window.
Pre-heat – Ensuring comfort on schedule	With Pre-Heat mode, the neoFlo starts heating before the scheduled time, ensuring the desired temperature is reached exactly when needed.
Offset temperature – Fine-tune room comfort	neoFlo measures temperature at the radiator and actual room temperature may vary. You can apply a temperature offset in a range of ±5K to correct this. For example, if 20°C is set, but the room only reaches 18°C, an offset of -2°C can be applied. The default offset is 0°C in the IMI Heatmiser neoApp.
Keeps itself up-to-date	Once paired with the neoHub, neoFlo automatically checks for software updates and installs them in the background — no action needed, no interruptions.

Common Questions

How does the neoFlo system work?

neoFlo fits to the radiator and controls the flow of warm water through the valve to manage the room temperature. If you want the system to be able to call for heat, neoFlo can send an RF signal to the IMI Heatmiser RF Switch, which can then trigger the boiler, zone valve or other heat source output. For connected control, neoFlo can also pair with neoHub G3, which links to your router so the system can be managed through the neoApp.

In simple terms: the heat source provides warm water, neoFlo controls the radiator, the RF Switch can request heat when needed, and neoHub G3 connects everything to the app for smarter control.

Diagram showing how neoFlo works with the heat source, RF Switch, neoHub G3 and neoApp

Do I need to buy neoFlo as a pack?

No. The packs have been created to help guide the right setup. For example, if you already have a neoHub G3, you can buy neoFlo and an RF Switch to build the system you need.

Does neoFlo use batteries?

Yes. neoFlo uses 4 x AA batteries, with battery life designed to last up to six years.

Will neoFlo fit my radiator valve?

neoFlo is fitted with an M30 x 1.5 connection, which fits most modern radiator valves. It is also supplied with an RA adapter for other valves. For older radiator types, please refer to the setup sheet, which lists adapters for other valve types which are also available to buy.

Do I need a neoHub G3?

neoFlo can be used on its own for individual radiator control but for app control and smarter automation, a neoHub G3 is required.

Why would I need an RF Switch?

The RF Switch receives signals and can call for heat from a boiler, zone valve or other heat source output independently, giving full zone control of your system.

Can I pair multiple neoFlo devices with neoHub G3 and RF Switch?

Yes. You can pair multiple neoFlo devices with neoHub G3 for smart control of radiators throughout the home. To create a system that can call for heat, up to 20 neoFlo devices can also be paired with an RF Switch, with up to 10 devices per channel.

Can I use neoFlo on its own?

Yes. neoFlo can be used to control the temperature of an individual radiator without a hub. For wider system features such as app control and smarter automation, it can be paired with neoHub G3.