The Heatmiser neoStat WiFi is a smart programmable thermostat designed for heating control, WiFi app control, and optional time clock operation. Unlike standard neoStat models that require a neoHub, this WiFi version connects directly to the home WiFi network through the Heatmiser neoApp.
The official manual covers installation, WiFi setup, thermostat mode, time clock mode, sensor options, comfort levels, temperature hold, frost protection, holiday mode, optional settings, floor probe type, wiring diagrams, WiFi reset, factory reset, Apple HomeKit support, and Heatmiser support details.
What Is a Programmable Room Thermostat?
A programmable room thermostat works as both a programmer and a room thermostat.
| Function | Purpose |
| Programmer | Sets heating ON and OFF periods |
| Room thermostat | Measures room temperature and switches heating based on the set temperature |
The manual explains that setting the thermostat higher does not heat the room faster. Heating speed depends on the heating system design and size. The best approach is to find the lowest comfortable temperature and let the thermostat follow the programmed schedule.
Key Features
The Heatmiser neoStat WiFi includes:
- Direct WiFi connection through the Heatmiser neoApp
- Thermostat mode and time clock mode
- Apple HomeKit and Siri support
- Flush-mounted installation
- Approach sensor with illuminated touch keys
- Built-in, remote air, and floor sensor options
- Room and floor temperature display
- Weekday/weekend, 7-day, and 24-hour programming
- Non-programmable thermostat mode
- Temperature hold
- Holiday mode
- Frost protection
- Keypad lock with PIN
- Optional floor temperature limit
- Floor probe type support for 10K, 12K, and 15K probes
- Boiler, valve, UH8, and time clock wiring options
- WiFi reset and factory reset functions
Important Installation Notes
The neoStat WiFi is designed to be flush mounted and requires a 35mm minimum depth back box.
Installation Do’s and Don’ts
| Do | Don’t |
| Mount the thermostat at eye level | Do not install near a direct heat source |
| Read the manual before setup | Do not press hard on the LCD screen |
| Follow the correct wiring diagram | Do not block airflow around the thermostat |
The wiring diagrams state that the product must only be installed by a qualified electrician and must comply with local installation regulations.
Parts and Controls
The neoStat WiFi has a square LCD screen with touch-sensitive keys below the display.
Main Controls
| Control | Function |
| Left arrow | Moves through menu options |
| Tick key | Confirms selections and enters settings |
| Right arrow | Moves through menu options |
| Down key | Lowers temperature, time, or setting values |
| Up key | Raises temperature, time, or setting values |
Main Menu Options
Depending on the selected mode, the screen may show:
- Power
- Setup
- Clock
- Hold
- Holiday
- Edit
- Cancel
- Done
Product Specifications
| Specification | Detail |
| Product model | Heatmiser neoStat WiFi |
| Product type | Smart programmable WiFi thermostat |
| Mounting type | Flush mounted |
| Back box depth | 35mm minimum |
| Operating modes | Mode 1 Thermostat, Mode 2 Time Clock |
| Default mode | Thermostat mode |
| WiFi setup | Heatmiser neoApp |
| App control | Heatmiser neoApp |
| Apple support | Apple HomeKit and Siri |
| Sensor options | Built-in air, remote air, floor, built-in + floor, remote air + floor |
| Floor probe compatibility | 10K, 12K, 15K |
| Floor limit range | 20°C to 45°C |
| Floor limit default | 28°C |
| Frost protection range | 7°C to 17°C |
| Frost default | 12°C |
| Switching differential | 0.5°C, 1.0°C, 2.0°C, 3.0°C |
| Output delay | 00 to 15 minutes |
| Program modes | Non-programmable, weekday/weekend, 7 day, 24 hour |
| Temperature format | °C or °F |
| WiFi frequency | 2.412–2.472 GHz |
| Output power | 17.0 dBm, 802.11 |
| Compliance | Directive 2014/53/EU |
How to Install the Heatmiser neoStat WiFi
Installation Steps
- Loosen the retaining screw
Use a small screwdriver to loosen the screw from the bottom face of the thermostat. - Separate the front from the back plate
Carefully remove the front half from the back plate. - Place the thermostat front safely aside
Keep the front panel protected during wiring. - Connect the wiring
Terminate the thermostat using the wiring diagrams on pages 29–32 of the manual. For time clock wiring, use the diagram on page 38. - Secure the back plate
Screw the back plate into the wall back box. - Clip the front back on
Attach the thermostat front to the back plate and secure it with the retaining screw.
Power On and Off
The thermostat shows the flame icon when heating is active. If the flame icon is not visible, heating is not required, but the thermostat remains active.
Turn the Thermostat Off
- Scroll to the Power icon.
- Hold the Tick key for about 3 seconds.
- The display goes blank.
- Heating output turns off.
Turn the Thermostat Back On
Press the Tick key once.
Mode Select: Thermostat or Time Clock
The neoStat WiFi can work in two modes:
| Mode | Function |
| Mode 1 | Thermostat |
| Mode 2 | Time Clock |
Thermostat mode is the default setting.
How to Change Mode
- Use Left/Right to scroll to the power icon.
- Press and hold Tick for 3 seconds.
- When SETUP is highlighted, press and hold Tick for 10 seconds.
- Use Left/Right to choose:
- Mode 1 = Thermostat
- Mode 2 = Time Clock
- Press Tick to confirm.
The thermostat returns to the main display in the selected mode.
Connecting to the WiFi Network
The neoStat WiFi connects directly to the home WiFi network through the Heatmiser neoApp.
WiFi Setup Steps
- Download the Heatmiser neoApp to a smartphone or tablet.
- Sign in with an existing account or register a new account.
- From the Locations screen, tap the add option and choose neoStat WiFi from the dropdown menu.
- Give the location a name, such as Home.
- Connect directly to the thermostat’s WiFi hotspot by selecting neoStat WiFi.
- Once connected to the thermostat hotspot, select the home WiFi network.
- Give the thermostat a room title, such as Living Room.
- Follow the app instructions to complete setup.
After connection, users can control the heating system through the app.
Approach Sensor
The neoStat WiFi uses proximity sensing. When someone approaches the thermostat, the touch keys and display light up automatically.
This helps when changing the temperature or timer in a dark room.
Mode 1: Thermostat Mode
Thermostat Mode LCD Display
| Display Item | Meaning |
| WiFi symbol | Connected to the home WiFi network |
| Day indicator | Shows day of the week |
| Frost protection icon | Frost protection is enabled |
| Flame symbol | Thermostat is calling for heat; flashes during optimum start |
| Holiday icon | Holiday mode is active |
| Floor limit symbol | Floor probe has reached the configured floor temperature limit |
| Floor/Room Temp | Shows active sensor mode |
| Set | Set point is being changed |
| Program indicator | Shows comfort level being edited |
| Main menu | Shows selected menu option |
| Keypad lock | Keypad is locked |
| Temperature | Shows current sensor temperature |
| Temperature format | °C or °F |
| Hold Left | Temperature hold is active |
| Time/Day/Month/Year | Used for clock, calendar, or holiday setup |
Temperature Display and Sensor Options
The neoStat WiFi can use different sensor configurations:
- Built-in air sensor
- Remote air sensor
- Floor sensor only
- Built-in air sensor and floor sensor
- Remote air sensor and floor sensor
The display shows either Room Temp or Floor Temp depending on the active sensor mode.
When both air and floor sensors are used, room temperature appears by default. To view the current floor temperature, press and hold the Left and Right arrow keys for 5 seconds.
Setting the Clock
- Use Left/Right to scroll to the power icon.
- Press and hold Tick to turn off the display.
- Use the Right arrow to select CLOCK.
- Press Tick to confirm.
- Use Up/Down to set the year.
- Press Tick.
- Repeat for month, date, and time.
- Press Tick to save.
- Use the Down arrow to scroll back to the power icon.
- Press Tick to turn the display on.
Comfort Levels and Programming
The neoStat WiFi supports:
| Program Mode | Description |
| Weekday/Weekend | Weekday and weekend schedules |
| 7 Day | Separate schedule for each day |
| 24 Hour | Same schedule every day |
| Non-programmable | Manual temperature control only |
Once the thermostat is connected online, the program mode is configured through the neoApp.
Default Comfort Levels
| Period | Time | Temperature |
| Wake | 07:00 | 21°C |
| Leave | 09:00 | 16°C |
| Return | 16:00 | 21°C |
| Sleep | 22:00 | 16°C |
Unused comfort levels should be set to –:–.
How to Set Comfort Levels
- Scroll to EDIT.
- Press Tick.
- Use Left/Right to select the day or period.
- Press Tick.
- When WAKE flashes, press Tick.
- Use Up/Down to set the hour.
- Press Tick.
- Use Up/Down to set the minutes.
- Press Tick.
- Use Up/Down to set the temperature.
- Press Tick.
- Press the Right arrow to move to LEAVE.
- Repeat for all comfort levels.
- Set unused periods to –:–.
- Scroll to DONE and press Tick.
Temperature Control
To temporarily change the set temperature:
- Press Up or Down.
- The screen shows SET and the desired temperature.
- Use Up/Down to change the set value.
- Press Tick to confirm.
This new temperature remains active only until the next programmed comfort level.
Temperature Hold
Temperature Hold overrides the heating program for a selected duration.
How to Set Temperature Hold
- Scroll to HOLD.
- Press Tick.
- Use Up/Down to set the hold period.
- Press Tick.
- Use Up/Down to set the hold temperature.
- Press Tick.
The display shows HOLD LEFT, and the time counts down before returning to the normal program.
Cancel Temperature Hold
With HOLD selected, press Tick, then press Tick again while Cancel is highlighted.
Locking and Unlocking the Thermostat
The neoStat WiFi includes a keypad lock with a four-digit PIN.
Lock the Thermostat
- Use Left/Right to scroll to HOLD.
- Press and hold Tick for 10 seconds.
- The display shows 0000.
- Use Up/Down to enter the first two digits.
- Press Tick.
- Use Up/Down to enter the second two digits.
- Press Tick.
- The keypad lock icon appears.
Unlock the Thermostat
- Press Tick once.
- Enter the four-digit PIN using Up/Down and Tick.
- The display unlocks and returns to the main screen.
Frost Mode
Frost Mode keeps heating off unless the room temperature drops below the frost protection temperature.
Enable or Disable Frost Mode
- Scroll to the Power icon.
- Press Tick.
- The frost icon toggles on or off.
If heating starts during frost mode, the flame icon appears.
Holiday Mode
Holiday mode works in both thermostat mode and time clock mode.
In Thermostat Mode
The thermostat reduces the set temperature to the frost protection temperature and maintains it until the holiday period ends.
In Time Clock Mode
The timed output remains OFF during the holiday period.
Set Holiday Mode
- Scroll to HOLIDAY.
- Press Tick.
- Use Up/Down to set the year.
- Press Tick.
- Repeat for month, date, and time.
- Press Tick to confirm.
Holiday mode starts immediately and returns to normal operation at the configured time and date.
Cancel Holiday Mode
- Scroll to HOLIDAY.
- Press Tick.
- When CANCEL appears, press Tick.
Optional Thermostat Settings
| Feature | Description | Settings |
| 01 | Pairing to neoApp | Adds neoStat WiFi to the app |
| 02 | Switching differential | 0.5°C, 1.0°C, 2.0°C, 3.0°C |
| 03 | Frost protection temperature | 7°C to 17°C |
| 04 | Output delay | 00 to 15 minutes |
| 05 | Up/down temperature limit | 00°C to 10°C |
| 06 | Sensor selection | Built-in, remote air, floor, built-in + floor, remote air + floor |
| 07 | Floor temperature limit | 20°C to 45°C |
| 08 | Optimum start | 00 to 05 hours |
| 09 | Rate of change | Minutes to raise by 1°C |
| 10 | Not used | Not used |
| 11 | Not used | Not used |
| 12 | Program mode | Non-programmable, weekday/weekend, 7 day, 24 hour |
| 13 | Temperature format | °C or °F |
Important note: when controlling electric underfloor heating, the manual states that air sensor only must not be used. A floor sensor or air + floor sensor setup should be used.
Adjusting Optional Settings
- Use Left/Right to scroll to the power icon.
- Press and hold Tick for 3 seconds.
- When SETUP appears, press Tick once.
- Use Up/Down to scroll through features.
- Use Left/Right to change each setting.
- Press Tick to confirm and exit.
Re-Calibrating the Thermostat
- Scroll to the power icon.
- Press and hold Tick to turn the display off.
- Press and hold Tick + Down for 10 seconds.
- The current temperature appears.
- Use Up/Down to set the new temperature value.
- Press Tick to confirm.
- Press Down to highlight the power icon.
- Press Tick once to turn the thermostat back on.
Floor Temperature Sensor Probe Type
The neoStat WiFi is configured by default for 10K sensor probes, but it is also compatible with 12K and 15K probes.
Change Probe Type
- Scroll to the power icon.
- Press and hold Tick to turn the display off.
- Press and hold Up + Down for 5 seconds.
- Use Left/Right to select:
- 10 = 10K probe
- 12 = 12K probe
- 15 = 15K probe
- Press Tick to confirm.
The manual says this change should only be carried out by an experienced technician who has confirmed the probe value.
Error Codes
| Error Code | Meaning | Recommended Action |
| E0 | Internal sensor fault | Contact Heatmiser support or an installer |
| E1 | Remote floor probe not connected, wired incorrectly, or faulty | Check the floor probe wiring and probe type |
| E2 | Remote air probe not connected, wired incorrectly, or faulty | Check the remote air probe wiring |
Wiring Diagram Summary
The manual includes several wiring diagrams for thermostat and time clock use.
Thermostat Mode Wiring
| Wiring Diagram | Purpose |
| neoStat WiFi to Boiler S/L | Switched live boiler connection |
| neoStat WiFi to Boiler Voltfree | Volt-free boiler thermostat connection |
| neoStat WiFi to Valve | Heating valve connection |
| neoStat WiFi to UH8 and optional remote probe connections | UH8 wiring with optional floor and remote air probes |
The wiring diagrams include terminals such as RT2, RT1, -, A2, A1, N, and L. Boiler diagrams also instruct installers to consult the boiler manufacturer’s wiring diagram before connecting.
Mode 2: Time Clock Mode
In Time Clock Mode, the neoStat WiFi controls a timed output instead of temperature-based heating.
Time Clock LCD Display
| Display Item | Meaning |
| WiFi symbol | Connected to home WiFi network |
| Day indicator | Shows day of week |
| Holiday | Time clock is in holiday mode |
| Set | Settings are being changed |
| Program indicator | Switching period being edited |
| Main menu | Shows selected option |
| Keypad lock | Keypad is locked |
| Timer status | Shows timed output ON/OFF |
| Hold Left | Timer override is active |
| Time/Day/Month/Year | Used for clock, calendar, and holiday setup |
Setting Switching Times
- Scroll to EDIT.
- Press Tick.
- Use Left/Right to select the day or period.
- Press Tick.
- Switching time 1 flashes and the current ON time appears.
- Press Down to view the OFF time.
- Select a switching time and press Tick.
- Use Up/Down to set ON hours.
- Press Tick.
- Set ON minutes.
- Press Tick.
- Set OFF hours.
- Press Tick.
- Set OFF minutes.
- Press Tick.
- Press the Right arrow to move to the next switching time.
- Repeat for all periods.
- Set unused periods to –:–.
- Scroll to DONE and press Tick.
Timer Override
Timer Override turns the timed output on for a selected duration.
Timer Override Steps
- Use Up/Down to set the override duration, such as 02:00.
- Press Tick to confirm.
- The screen shows HOLD LEFT and the remaining override time.
Time Clock Optional Features
| Feature | Description | Settings |
| 01 | Pairing to neoApp | Connects the thermostat to the app |
| 02 | Program mode | Weekday/weekend, 7 day, or 24 hour |
Time Clock Wiring
The Time Clock Mode wiring diagram shows:
- 230V supply input
- Neutral and live
- Volt-free output
- A2/A1 output terminals
- Option to link Live to A1 for 230V output on A2
The manual states that the product must only be installed by a qualified electrician and must follow local installation regulations.
WiFi Reset
WiFi reset re-enables the thermostat’s WiFi hotspot.
WiFi Reset Steps
- Scroll to the power icon.
- Press and hold Tick to turn the display off.
- SETUP appears.
- Press Tick once while SETUP is highlighted.
- Hold Tick for 10 seconds until the WiFi symbol appears static.
- The WiFi symbol appears briefly before returning to SETUP and CLOCK.
- Press Down to highlight the power icon.
- Tap Tick to return to the main display.
- 01 flashes in the top-right corner of the display.
Factory Reset
Factory reset clears setup and pairing settings. Setup and pairing must be repeated afterward.
Factory Reset Steps
- Scroll to the power icon.
- Press and hold Tick to turn the display off.
- SETUP appears.
- Press and hold Tick for 10 seconds.
- All display icons appear for 2 seconds.
- The number 1 or 2 flashes.
- Use Left/Right to choose:
- Mode 1 = Thermostat
- Mode 2 = Time Clock
- Press Tick to confirm.
Apple HomeKit Support
The neoStat WiFi supports Apple HomeKit setup through the neoApp.
HomeKit Setup Summary
- Pair the Heatmiser neoStat WiFi to HomeKit using the neoApp.
- From settings, select HomeKit & Siri.
- Create a new Home if needed.
- Add a new accessory.
- Scan the HomeKit QR setup code using the iOS device camera.
- Assign devices to HomeKit rooms.
- Edit service names for Siri voice control.
- Finish setup.
- Use Apple Home to create automations, share control, and configure other HomeKit devices.
The manual points users to Apple Home and Heatmiser neo resources for more details.
Troubleshooting Guide
| Problem | Possible Cause | Recommended Action |
| WiFi symbol missing | Thermostat is not connected to home WiFi | Reconnect through neoApp or perform WiFi reset |
| Heating does not turn on | Room temperature may already be above set point | Check flame icon and set temperature |
| Floor limit icon appears | Floor probe reached the configured limit | Check floor limit setting |
| E0 appears | Internal sensor fault | Contact support or installer |
| E1 appears | Floor probe fault | Check floor probe wiring and probe type |
| E2 appears | Remote air probe fault | Check remote air probe wiring |
| Buttons do not respond | Keypad lock is active | Unlock using the four-digit PIN |
| Time clock output stays off | Holiday mode or schedule issue | Check holiday mode and switching times |
| App cannot find thermostat | WiFi hotspot/setup issue | Run WiFi reset and repeat app setup |
| Wrong floor temperature shown | Probe type may be incorrect | Verify whether 10K, 12K, or 15K probe is installed |
| Electric underfloor heating not working safely | Air sensor only selected | Use floor sensor or air + floor sensor mode |
Support and Contact
Heatmiser provides technical support, PDFs, FAQs, and specifications through its official channels.
Heatmiser UK Ltd Support
Support phone: +44 (0)1254 669090
Website: www.heatmiser.com
Address:
Heatmiser UK Ltd
Units 1-5 Hurstwood Court, Mercer Way
Shadsworth Business Park
Blackburn, Lancashire, BB1 2QU
United Kingdom
The manual states that Heatmiser declares the neoStat WiFi complies with Directive 2014/53/EU. Operating frequency is Wi-Fi 2.412–2.472 GHz, with output power listed as 17.0 dBm (802.11).