Smart Time Clock neoStat-hw V3

IMI Heatmiser Smart Time Clock neoStat-HW V3

The IMI Heatmiser neoStat-HW V3 is a smart programmable time clock designed to control domestic hot water systems using scheduled ON and OFF periods. It allows hot water operation to be programmed for different times of the day, with separate schedules for weekdays, weekends, or individual days.

The neoStat-HW V3 features an LCD display, five touch-sensitive navigation buttons, an approach sensor, hot water boost, holiday programming, standby operation, and a four-digit keypad lock.

The time clock supports three programming arrangements: Weekday/Weekend (5/2 Day), 7 Day, and 24 Hour. Each arrangement provides four programmable ON/OFF switching periods for the selected day or day group.When paired with a compatible Heatmiser neoHub, the neoStat-HW V3 communicates through the neo mesh network and connects to the Heatmiser neoApp.

The unit is designed for flush-mounted installation and supports hot water control arrangements using an S Plan valve or a mid-position valve. Its electrical terminals include separate connections for the timer supply, switching contacts, and an additional neoStat supply shown in the manufacturer’s wiring diagrams.

Product Overview and Technical Specifications

The neoStat-HW V3 belongs to the IMI Heatmiser neo Series and provides programmable time-based control for hot water systems.

How the Hot Water Time Clock Works

The neoStat-HW V3 controls a timed output according to a programmed switching schedule.

During an ON period, the time clock activates its timed output. When the programmed OFF time is reached, the output changes to its OFF state.

The switching schedule can be adjusted to match the times when hot water is normally required.

Programmable Hot Water Operation

The time clock provides four ON/OFF switching periods for each programmed day or day group.

Each period has two settings:

• ON Time: The time at which the programmed output switches on.
• OFF Time: The time at which the programmed output switches off.

The time clock follows these periods according to the selected programming mode.

Independent Daily Programming

The available programming modes allow different scheduling arrangements.

Weekday/Weekend programming provides separate schedules for weekdays and weekends. In 7 Day Mode, every day can have its own schedule. In 24 Hour Mode, the same schedule repeats daily.

Hot Water Boost

The Hot Water Boost function temporarily switches the timed output on for a selected duration.

This allows the normal programmed output state to be overridden without editing the switching schedule.

Hot Water Cylinder Thermostat

The manufacturer’s wiring diagrams show the neoStat-HW V3 connected to a separate hot water thermostat and valve arrangement.

The time clock provides programmed switching control, while the connected hot water thermostat forms part of the system’s temperature control arrangement.

Parts, Components, and Control Buttons

The neoStat-HW V3 has an LCD display and five touch-sensitive navigation keys positioned below the screen.

The unit includes a removable front panel, mounting back plate, retaining screw, and electrical terminal connections.

Main Components

Touch Control Buttons

Some functions require the Tick button to be held for several seconds.

Understanding the LCD Display

The LCD provides information about the current time, programmed switching periods, output status, wireless connection, and temporary overrides.

LCD Indicators and Symbols

TIMER ON and TIMER OFF

The display identifies the current timed output status.

TIMER ON indicates that the output is on.

TIMER OFF indicates that the output is off.

The timed output changes according to the programmed schedule or an active override.

HOLD LEFT Indicator

HOLD LEFT appears when a timer override is active.

The display also shows the remaining override duration.

Mesh Network Indicator

The mesh symbol appears when the neoStat-HW V3 is communicating with the neoHub.

If the mesh symbol disappears, communication with the hub has been lost.

Keypad Lock Indicator

The keypad lock symbol appears when the keypad is locked.

The symbol remains visible until the keypad is unlocked using the configured four-digit PIN.

Approach Sensor

The neoStat-HW V3 includes an approach sensor that detects when someone moves toward the time clock.

As a person approaches, the LCD backlight and touch-sensitive navigation keys illuminate.

This makes the display and controls easier to see when adjusting hot water settings in a dark room.

Safety Instructions and Installation Requirements

The neoStat-HW V3 must be installed according to the manufacturer’s electrical wiring diagrams.

Installation must be performed by a qualified electrician and comply with applicable local electrical regulations.

Installation Precautions

• Mount the time clock at eye level.
• Read the operating and installation instructions before use.
• Do not install the unit close to a direct heat source because this may affect operation.
• Do not press forcefully on the LCD screen because permanent damage may occur.
• Use a recessed wall back box with a minimum depth of 35 mm.
• Follow the correct wiring diagram for the installed hot water valve arrangement.
• Use the manufacturer’s terminal layout when making electrical connections.

Electrical Wiring Safety

The neoStat-HW V3 wiring diagrams show live and neutral supply connections, timer switching contacts, and external hot water system components.

Electrical connections must be completed by a qualified electrician.

The correct wiring arrangement depends on whether the system uses an S Plan hot water valve or a mid-position valve.

Installing the neoStat-HW V3

The neoStat-HW V3 is designed for flush mounting into a recessed wall back box.

A minimum back box depth of 35 mm is required.

Step 1: Remove the Front Panel

1. Locate the retaining screw on the bottom face of the time clock.
2. Remove the screw using a suitable screwdriver.
3. Carefully separate the front panel from the back plate.
4. Place the front panel somewhere safe.

Step 2: Connect the Electrical Wiring

The electrical connections must be completed according to the appropriate manufacturer’s wiring diagram.

Two installation arrangements are illustrated:

• S Plan hot water valve wiring.
• Mid-position valve wiring.

The diagrams show the electrical supply, switching terminals, external hot water thermostat, valve connections, and boiler control connections.

Step 3: Mount the Back Plate

1. Position the time clock back plate against the recessed wall back box.
2. Align the mounting holes.
3. Screw the back plate securely into the back box.

Step 4: Reattach the Front Panel

1. Position the front panel against the mounted back plate.
2. Carefully clip the front section into place.
3. Insert and tighten the retaining screw.

The time clock is now mounted and ready for the appropriate setup procedures.

Setting Up the Heatmiser neoHub

The neoStat-HW V3 can communicate with a compatible Heatmiser neoHub.

The neoHub must first be connected to the router and paired with an account in the Heatmiser neoApp.

Step 1: Connect the neoHub to the Router

1. Connect the neoHub to the router using the Ethernet cable supplied with the hub.
2. Connect the neoHub power supply.
3. Wait for the router to assign an IP address.

The Link LED turns red when the neoHub connects to the local network.

Once the neoHub connects to the Heatmiser cloud server, the Link LED turns green.

Step 2: Install the Heatmiser neoApp

1. Connect the smartphone or tablet to the same Wi-Fi network as the router.
2. Download the Heatmiser neoApp from the Apple App Store or Google Play Store.
3. Register an account.
4. Sign in to the neoApp.

Step 3: Add the neoHub to the Account

1. Select Add Location in the neoApp.
2. Press the Connect button on the neoHub when prompted.
3. Wait for the hub to connect successfully.
4. Enter a name for the location, such as Home.

The neoHub is now associated with the account.

Pairing the neoStat-HW V3 With the neoHub

After setting up the neoHub, the neoStat-HW V3 can be added as a zone.

The manufacturer recommends pairing the neoStat located nearest to the neoHub first.

Step 1: Start Pairing in the neoApp

1. Open the Heatmiser neoApp.
2. Select ADD NEOSTAT.
3. Enter a preset or custom name for the time clock.
4. Press NEXT.

The app provides two minutes for the neoStat-HW V3 to join the neoHub.

Step 2: Activate Pairing on the Time Clock

1. Use Left and Right to highlight the Power symbol.
2. Press and hold Tick.
3. SETUP becomes highlighted.
4. Press Tick once.
5. Feature 01 appears on the display.
6. Press Tick again to activate pairing.

The mesh symbol begins flashing.

Step 3: Confirm the Connection

When the neoStat-HW V3 successfully connects to the neoHub, the mesh symbol remains continuously displayed.

In the neoApp:

• Select ADD ANOTHER to add additional zones.
• Select FINISH to complete setup.

Adding Additional neoStats

The neoHub only needs to be paired with the app account once.

To add another compatible neoStat:

1. Open ZONES in the neoApp.
2. Select EDIT.
3. Select ADD ZONE.
4. Follow the pairing procedure for the additional device.

Understanding the Mesh Network

The neoStat-HW V3 communicates through the Heatmiser mesh network.

Compatible neoStat devices can send and receive signals through other connected thermostats on the network.

Signals can be relayed from one device to another until they reach their destination.

This arrangement extends communication range and provides greater network stability than conventional radio-frequency thermostat connections.

Mesh Connection Status

The mesh symbol remains visible while the neoStat-HW V3 is communicating with the neoHub.

When the mesh symbol disappears, the connection to the neoHub has been lost.

Setting the Clock and Calendar

The neoStat-HW V3 uses its clock and calendar to operate hot water switching schedules and Holiday Mode.

The correct time and date should be configured before setting the hot water schedule.

How to Set the Clock

1. Use Left and Right to highlight the Power symbol.
2. Press and hold Tick to switch off the display.
3. Use Right to select CLOCK.
4. Press Tick to confirm.
5. Use Up and Down to select the current year.
6. Press Tick.
7. Use Up and Down to select the current month.
8. Press Tick.
9. Repeat the procedure to set the date and time.
10. Press Tick to confirm the completed clock settings.
11. Use Down to highlight the Power symbol.
12. Press Tick to switch the display back on.

Clock and Calendar Display

The display shows the selected day and current time during normal operation.

The year, month, date, and time can be adjusted through the CLOCK settings.

Hot Water Programming Modes

The neoStat-HW V3 supports three programmable scheduling modes.

These modes determine how the hot water ON and OFF switching times are assigned throughout the week.

Available Programming Modes

Weekday/Weekend is the factory default programming mode.

Weekday/Weekend Programming

This mode provides separate schedules for weekdays and weekends.

One group of four ON/OFF periods applies to Monday through Friday.

A second group of four ON/OFF periods applies to Saturday and Sunday.

7 Day Programming

In 7 Day Mode, every day can have its own switching schedule.

Four ON/OFF periods can be configured independently for Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, and Sunday.

24 Hour Programming

In 24 Hour Mode, the same switching times apply every day.

The selected ON/OFF periods repeat continuously throughout the week.

Setting the Hot Water ON and OFF Times

The neoStat-HW V3 allows up to four ON/OFF switching periods to be programmed for a day or day group.

Each switching period contains an ON time and an OFF time.

Switching Periods

How to Program the Hot Water Times

1. Use Left and Right to highlight EDIT.
2. Press Tick.
3. Use Left and Right to select the required day or day group.
4. Press Tick to confirm.
5. Switching period 1 begins flashing.
6. The current ON time appears.
7. Press Down to view the existing OFF time if required.
8. Select the switching period and press Tick.
9. Use Up and Down to set the ON hour.
10. Press Tick.
11. Use Up and Down to set the ON minutes.
12. Press Tick.
13. Use Up and Down to set the OFF hour.
14. Press Tick.
15. Use Up and Down to set the OFF minutes.
16. Press Tick to confirm.
17. Press Right to move to switching period 2.
18. Repeat the procedure for the remaining switching periods.
19. Use Left and Right to highlight DONE.
20. Press Tick to save all changes.

The time clock then follows the programmed switching times.

How to Program Weekday and Weekend Times

When Weekday/Weekend Mode is selected, the schedule is divided into Monday–Friday and Saturday–Sunday.

Select the required day group before changing its switching periods.

Each group can have four separate ON/OFF periods.

How to Program Different Times for Each Day

Select 7 Day Programming through the optional settings.

The EDIT menu can then be used to configure the switching periods for each day independently.

Disabling Unused Switching Periods

Any unused switching period can be disabled by setting its time to –:–.

The time clock skips that period.

For example, when fewer than four switching periods are required, the remaining periods can be disabled.

Hot Water Boost Function

The neoStat-HW V3 includes a timer override function used for Hot Water Boost.

The function temporarily switches the timed output on for a selected duration.

How to Activate Hot Water Boost

1. Use Up and Down to select the required override duration.
2. For example, select 02:00 for a two-hour override.
3. Press Tick to confirm.

The time clock returns to its main display.

HOLD LEFT appears together with the remaining override time.

Understanding the Boost Countdown

The remaining time is displayed while the override is active.

The timed output is on during the selected override period.

When the override duration expires, the time clock returns to its normal programmed operation.

Boost Display Indicators

Standby Mode

Standby Mode switches off the time clock display and its timed output.

How to Activate Standby

1. Use Left and Right to highlight the Power symbol.
2. Press and hold Tick for approximately 3 seconds.
3. Continue until the display becomes blank.

The timed output is switched off during Standby Mode.

How to Leave Standby

Press Tick once.

The time clock turns back on and returns to its normal operating display.

Standby and Hot Water Output

When Standby Mode is active, the timed output remains off.

This is different from normal programmed operation, where the output switches according to the configured ON and OFF times.

Holiday Mode

Holiday Mode keeps the timed output off for a selected period.

At the end of the holiday, the neoStat-HW V3 automatically returns to its normal programmed schedule.

How to Activate Holiday Mode

1. Use Left and Right to highlight HOLIDAY.
2. Press Tick.
3. Use Up and Down to select the year in which the holiday will end.
4. Press Tick.
5. Use Up and Down to select the ending month.
6. Press Tick.
7. Repeat the procedure for the ending date and time.
8. Press Tick to confirm.

The holiday period begins immediately.

The timed output remains off during the holiday.

When the selected ending date and time is reached, normal programmed operation resumes automatically.

How to Cancel Holiday Mode

1. Use Left and Right to highlight HOLIDAY.
2. Press Tick.
3. CANCEL becomes highlighted.
4. Press Tick again to cancel the holiday.

The time clock returns to its normal operation.

Locking and Unlocking the Keypad

The neoStat-HW V3 includes a keypad lock that uses a four-digit PIN.

This prevents normal control adjustments while the keypad is locked.

How to Lock the Keypad

1. Use Left and Right to highlight HOLD.
2. Press and hold Tick for 10 seconds.
3. The display shows 0000.
4. Use Up and Down to enter the first two digits of the required PIN.
5. Press Tick to confirm.
6. Use Up and Down to enter the final two digits.
7. Press Tick again.

The time clock returns to the main display.

The keypad lock indicator appears.

How to Unlock the Keypad

1. Press Tick once.
2. The display shows 00:00.
3. Use Up and Down to enter the first two digits of the previously configured PIN.
4. Confirm using Tick.
5. Enter the remaining two digits.
6. Confirm the PIN.

The keypad unlocks and returns to the main display.

Keypad Lock Indicator

The keypad lock symbol appears only while the keypad is locked.

Advanced Settings and Optional Features

The neoStat-HW V3 provides two optional configuration features.

These settings control neoHub pairing and the hot water programming mode.

How to Open the Optional Settings

1. Use Left and Right to highlight the Power symbol.
2. Press and hold Tick for 3 seconds.
3. SETUP becomes highlighted.
4. Press Tick once.
5. The feature number and setting value appear.
6. Use Up and Down to select the required feature.
7. Use Left and Right to change the selected setting.
8. Press Tick to confirm and exit.

Optional Features Table

Feature 01: neoHub Pairing

Feature 01 is used to connect the neoStat-HW V3 to a compatible Heatmiser neoHub.

The mesh symbol flashes during pairing and remains displayed once the connection has been established.

Feature 02: Programming Mode

Feature 02 selects the scheduling arrangement used for hot water switching times.

How to Change the Programming Mode

1. Highlight the Power symbol.
2. Press and hold Tick for 3 seconds.
3. Enter SETUP by pressing Tick once.
4. Use Up or Down to select Feature 02.
5. Use Left or Right to select 01, 02, or 03.
6. Press Tick to save the setting and exit.

The time clock uses the selected programming arrangement.

neoStat-HW V3 Electrical Wiring Diagrams

The neoStat-HW V3 includes electrical wiring diagrams for two hot water control arrangements.

These are:

• S Plan hot water valve wiring.
• Mid-position valve wiring.

All electrical connections must be completed by a qualified electrician in accordance with local electrical installation regulations.

Wiring Terminal Identification

The manufacturer’s diagrams identify the following terminal layout:

L — N — COM — NO — NC — L — N

The left-hand L and N connections are shown connected to the fused supply for the neoStat-HW V3.

The additional L and N terminals are illustrated as supply connections for another neoStat in the heating system.

The exact external connections depend on the selected wiring arrangement.

S Plan Hot Water Wiring

The S Plan wiring diagram shows the neoStat-HW V3 connected to a hot water thermostat and a separate hot water motorized valve.

The illustration is on PDF page 19 (printed manual page 18).

Components Shown in the S Plan Diagram

The diagram identifies:

• neoStat-HW V3 time clock.
• Fused live and neutral supply.
• Hot water thermostat.
• Hot water valve.
• Valve end switch.
• Boiler enable connection.
• Additional supply to a neoStat.

S Plan Valve Connections

The diagram labels the hot water valve wires using the following abbreviations:

The drawing shows the hot water thermostat in the control circuit and the valve’s end switch connected to the boiler enable arrangement.

How the S Plan Arrangement Operates

The neoStat-HW V3 provides timed hot water demand according to its programmed ON and OFF periods.

The connected hot water thermostat and valve form part of the external hot water control circuit.

The valve end switch is shown in the boiler enable circuit.

The installed connections must follow the manufacturer’s S Plan diagram.

Mid-Position Valve Wiring

The second wiring diagram illustrates the neoStat-HW V3 connected to a mid-position valve arrangement.

The illustration is on PDF page 20 (printed manual page 19).

Components Shown in the Mid-Position Valve Diagram

The diagram identifies:

• neoStat-HW V3.
• Fused supply to the time clock.
• Hot water thermostat.
• Mid-position valve.
• Supply to a heating neoStat.
• A2 control connection from the heating neoStat.
• Boiler enable connection.

Mid-Position Valve Wire Labels

The mid-position valve diagram includes the following wire abbreviations:

Heating neoStat Connection

The mid-position valve diagram identifies an additional heating neoStat.

The illustration shows its A2 connection associated with the valve circuit.

The drawing also identifies a supply connection to the heating neoStat.

Hot Water and Heating Control

The mid-position valve wiring arrangement combines the hot water programmer with the separate heating control circuit.

The neoStat-HW V3 provides scheduled hot water switching, while the external hot water thermostat, valve, heating neoStat, and boiler connections form the complete system arrangement.

The manufacturer’s original diagram must be followed for the final electrical connections.

Comparing the Two Wiring Arrangements

The wiring arrangement must match the installed heating and hot water system.

Factory Reset Instructions

The neoStat-HW V3 includes a factory reset function that restores default settings.

A factory reset cancels the parameters entered during setup and pairing. These settings must be configured again after the reset.

How to Factory Reset the neoStat-HW V3

1. Use Left and Right to highlight the Power symbol.
2. Press and hold Tick to turn the display off.
3. SETUP becomes highlighted.
4. Press and hold Tick for 10 seconds.
5. All LCD icons appear for approximately two seconds.
6. The display then shows a flashing operating mode number.
7. Use Left and Right to select the required mode.
8. The reset screen identifies Mode 1 as Thermostat and Mode 2 as Time Clock.
9. Select Mode 2 for hot water time clock operation.
10. Press Tick to confirm.

The device returns to its main operating display.

Settings After Factory Reset

The factory reset cancels setup and pairing information.

The following procedures must be completed again where required:

• Select the appropriate time clock operating mode.
• Configure the required programming mode.
• Set the hot water switching periods.
• Repeat the neoHub pairing procedure.

Operating Indicators and Troubleshooting

The following checks are based on the operating functions and display indicators described in this manual.

Checking the Hot Water Schedule

When the hot water output does not follow the expected switching times:

1. Check the current time and day.
2. Review the selected programming mode.
3. Open EDIT to review the switching periods.
4. Check whether Holiday Mode is active.
5. Check whether Standby Mode has been selected.

Checking the Current Timer Status

The LCD displays TIMER ON or TIMER OFF to identify the current output state.

This can be used to determine whether the neoStat-HW V3 is currently requesting the timed output to be on.

Checking an Active Boost

When HOLD LEFT appears, a temporary timer override is active.

The displayed countdown identifies the remaining duration.

Checking neoHub Communication

When the time clock is connected to the neoHub, the mesh icon remains visible.

If the symbol disappears, the connection to the neoHub has been lost.

The pairing procedure can be used when the device needs to be added to the hub again.

Radio Compliance Information

Heatmiser UK Ltd declares that the neoStat-HW V3 radio equipment complies with Directive 2014/53/EU.

Customer Support and Manufacturer Information

IMI Heatmiser provides product information and technical support through its official support channels.

Additional technical specifications and product information are available through the manufacturer’s official website.

Frequently Asked Questions

1. How is the Heatmiser neoStat-HW V3 hot water programmer set?

Use Left and Right to highlight EDIT, then press Tick.

Select the required day or day group, configure the ON and OFF times for each switching period, and move through the remaining periods using Right.

Highlight DONE and press Tick to save the programmed hot water schedule.

2. How many hot water switching periods does the neoStat-HW V3 support?

The neoStat-HW V3 supports four ON/OFF switching periods per programmed day or day group.

It can use Weekday/Weekend, 7 Day, or 24 Hour programming.

Unused switching periods can be disabled by setting their time to –:–.

3. How is Hot Water Boost activated on the neoStat-HW V3?

Use Up and Down to select the required override duration.

For example, 02:00 represents a two-hour override.

Press Tick to confirm.

The timed output switches on and HOLD LEFT appears with the remaining duration.

4. How is the neoStat-HW V3 connected to the neoHub?

Connect the neoHub to the router and register it through the Heatmiser neoApp.

Select ADD NEOSTAT in the app, then highlight Power on the neoStat-HW V3 and hold Tick.

Enter SETUP and activate Feature 01.

Press Tick again to begin pairing.

The mesh symbol flashes during pairing and remains displayed after successful connection.

5. How is the neoStat-HW V3 factory reset?

Highlight the Power symbol and hold Tick to switch off the display.

When SETUP appears, hold Tick for 10 seconds.

After the display icons appear, select Mode 2 for Time Clock operation and press Tick.

The reset cancels the previously configured setup and pairing parameters.

6. What is the difference between Weekday/Weekend and 7 Day programming?

Weekday/Weekend programming uses one hot water schedule for Monday–Friday and another for Saturday–Sunday.

In 7 Day Mode, each day has its own independently programmed ON and OFF switching periods.

Both modes support four switching periods per day or day group.

7. What happens when Holiday Mode is activated?

Holiday Mode switches the timed output off for the selected holiday period.

The holiday starts immediately and ends at the configured date and time.

When the holiday ends, the neoStat-HW V3 automatically returns to its normal programmed switching schedule.

8. What wiring arrangements are supported by the neoStat-HW V3?

The manufacturer’s manual includes wiring diagrams for S Plan and mid-position valve hot water systems.

The diagrams show connections for the fused supply, timer switching contacts, hot water thermostat, motorized valve, and boiler control circuit.

The appropriate wiring diagram must be followed by a qualified electrician.