UK industrial technology since 1998 Authorised Milesight distributor Ships from the UK
Milesight WT401 wireless smart thermostat
WT401-868M

Milesight WT401 Smart Thermostat

Authorised Milesight UK Distributor
In stock UKMilesight
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£112.23 ex VAT (£134.68 inc. VAT)

LoRaWAN wireless smart thermostat for PTACs, boilers, furnaces, heat pumps and radiators

The Milesight WT401 is a LoRaWAN wireless smart thermostat with a 2.7-inch e-ink display, a built-in temperature and humidity sensor and a PIR occupancy sensor. It controls HVAC systems through Milesight HVAC controllers or a BMS. Battery life is 5.2 years in Class A (SF7, EU868) but around 25 days in Class C, so continuous-control installs need a wired supply.

Battery life (Class A, EU868)5.2 years at SF7 / 3.3 years at SF10; Class C around 25 days

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In stock · typically dispatched within 14 working days from the UK

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Delivery & assurance

  • Ships from the UK
  • £14.25 flat UK delivery
  • Secure checkout — card, Klarna, invoice
  • Manufacturer's warranty

Ships to the UK & EU · VAT invoice provided · Delivery & returns

Questions about this product? Call our UK team: 023 9223 3611

Solutions this product serves
Energy & Net ZeroHeating & HVAC

Description

The WT401 is a Milesight smart thermostat — loRaWAN wireless smart thermostat for PTACs, boilers, furnaces, heat pumps and radiators.

Key features

  • LoRaWAN wireless smart thermostat for PTACs, boilers, furnaces, heat pumps and radiators
  • 2.7-inch E-ink screen; +/-0.2C typical temperature accuracy
  • Power options: 2x ER14505 batteries, AC/DC 24V, Type-C 5V or Powerbus
  • Wall-mount to 86mm square or 60mm round box; IP30
  • Operating range -20C to 60C; links with WT102 radiator thermostats

Supplied by Indiott, the UK industrial IoT specialists, with engineer-led support. Request a quote for pricing, stock and lead times.

Additional information

Weight 0.2 kg

WT401-868M specifications

Wireless TechnologyLoRaWAN®
FrequencyIN865/RU864/EU868/US915/AU915/KR920/AS923-1&2&3&4
Tx Power16 dBm (868 MHz) / 22 dBm (915 MHz)
Sensitivity-137 dBm
LoRaWAN ModeOTAA/ABP Class A / Class C
HVAC CompatibilityPTAC (2H/1C), boilers, furnaces or heat pumps (2H/1C) via Milesight UC7111 HVAC controllers; radiators via Milesight WT101/WT102
Temperature Control ModesHeat, EM (Emergency) Heat, Cool, Auto
Fan ModesLow, Medium, High, Auto, On, Circulate
Temperature Range-20°C ~ 60°C
Temperature AccuracyTypical ± 0.2°C, maximum ± 0.5°C
Temperature Resolution0.1°C
Humidity Range0% - 100% RH
Humidity AccuracyTypical ± 2% RH, maximum ± 5% RH
PIR Detection Area120° horizontal, 90° vertical
PIR Detection DistanceMaximum 6 m
Display2.7-inch black & white e-ink screen
Buttons5 buttons (power, system on/off, temperature up/down, control mode, fan mode)
Interfaces1 × USB Type-C (power or console); 1 × 2-pin power terminal connector (PowerBus)
ConfigurationMobile app via NFC or Bluetooth® 5.0, downlink
Power Supply2 × 2700 mAh ER14505 Li-SOCl2 replaceable batteries, AC/DC 24V, DC 5V Type-C, or PowerBus DC 24V (not usable simultaneously)
Battery Life (10 min report interval)Class A: 5.2 years (SF7, EU868), 3.3 years (SF10, EU868); Class C: around 25 days
Operating Temperature-20°C ~ 60°C (e-ink screen: 0°C ~ 40°C)
Relative Humidity0% to 95% (non-condensing)
Ingress ProtectionIP30
Dimensions86 × 86 × 24 mm
Material & ColourPC + ABS (UL94 V0), white
InstallationWall screw mounting; 86 mm square or European 60 mm round box; 118/120 wall box via wall plate accessories
Advanced FeaturesOccupied detection, smart display, child lock, button customisation, external sensor mode, multicast, FUOTA

Specifications taken from the manufacturer datasheet.

Which version do I need?

The datasheet lists frequency bands IN865/RU864/EU868/US915/AU915/KR920/AS923-1&2&3&4. UK LoRaWAN networks use EU868, the -868M part shown here; Tx power at 868 MHz is 16 dBm. Battery life is quoted separately for EU868 and US915.

Typical applications for the WT401-868M

  • Office HVAC zone control in commercial buildings
  • Hotel guest room temperature control
  • Retail store heating and cooling control
  • Occupancy-driven setback via the built-in PIR sensor
  • BMS-integrated HVAC control through a LoRaWAN gateway
  • Bulk schedule or setpoint changes across a site via multicast

Buying guides for this product

Commercial Heating Controls →

Frequency band

Supplied on EU868, the LoRaWAN band used in the UK and across Europe. That is the default and you do not need to ask for it — the -868M in the part number is the EU868 build.

The same WT401-868M unit also covers IN865 and RU864. Those bands share the 863–870 MHz radio with EU868, so one device can be set to any of them in its own configuration — no different part number needed.

US915, AU915, KR920 and AS923 are a different radio and therefore a different build. Milesight makes them and we can order them: tell us where the devices are being deployed and we will confirm the part number, price and lead time.

Not sure which band applies where? The Things Network publishes the LoRaWAN frequency plan for every country.

Complete the stack

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Which gateway do I need? Compare the Milesight range, from £98.76 →

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WT401-868M — frequently asked questions

Which heating and cooling systems does the WT401 work with?

It works with most HVAC systems over LoRaWAN, and specifically with PTAC (2H/1C), boilers, furnaces or heat pumps (2H/1C) through Milesight UC7111 HVAC controllers, and with radiators through Milesight WT101/WT102 thermostats. It is compatible with BMS systems via Milesight LoRaWAN gateways. The datasheet notes the Milesight UC711 HVAC controller is under development.

Can it run without wiring?

Yes. It takes 2 × 2700 mAh ER14505 Li-SOCl2 replaceable batteries, giving 5.2 years at SF7 or 3.3 years at SF10 on EU868 in Class A at a 10-minute report interval. Class C operation lasts only around 25 days on battery, so wired power is needed there: AC/DC 24V on the power connector, DC 5V on the Type-C port, or PowerBus DC 24V from a Milesight HVAC controller. The options cannot be used at the same time.

How accurate is the built-in sensor?

Temperature is measured from -20°C to 60°C with typical ± 0.2°C accuracy (maximum ± 0.5°C) at 0.1°C resolution. Humidity is 0-100% RH with typical ± 2% RH accuracy (maximum ± 5% RH) at 0.5% RH resolution. Both use digital CMOSens® MEMS technology.

Does it detect whether a room is occupied?

Yes, it has a PIR sensor covering 120° horizontally and 90° vertically to a maximum of 6 m, used for occupancy-based energy-saving temperature control.

What back box does it fit?

The body is 86 × 86 × 24 mm and mounts with wall screws, into an 86 mm square or European 60 mm round box, or into 118 or 120 wall boxes using wall plate accessories.

What is the operating temperature range?

The thermostat operates from -20°C to 60°C, but the e-ink screen is only specified from 0°C to 40°C. Ingress protection is IP30 and relative humidity 0-95% non-condensing.

How much does the Milesight WT401 Smart Thermostat cost in the UK?

The Milesight WT401 Smart Thermostat is £112.23 ex VAT from Indiott, a UK distributor. The price is published rather than quote-only, and we invoice with VAT (PSI Technologies Ltd, VAT GB 730 2340 83). UK delivery is a flat £14.25 per order ex VAT, whatever the weight.

What is the lead time and delivery cost for the Milesight WT401 Smart Thermostat?

The Milesight WT401 Smart Thermostat is in stock and typically dispatched within 14 working days from the UK. UK delivery is a flat £14.25 per order ex VAT, whatever the weight or how many items you order. We ship to GB and the EU and provide a VAT invoice with every order.

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