WT102-868M

Milesight WT102 Smart Radiator Thermostat

In stock UKMilesight

Where it sits in the stack

£97.26 ex VAT (£116.71 inc. VAT)

LoRaWAN smart radiator thermostat (TRV), self-powered by thermal energy harvesting

WT102 is a LoRaWAN radiator thermostat that is self-powered by temperature difference, generating power thermoelectrically when water temperature exceeds 45°C, so no battery replacement or wired supply is required. It fits M30 × 1.5 mm valves, with RA, RAV, RAVL, Giacomini and M28 adapters available, measures -20°C to 60°C to ±0.5°C, and holds up to 16 heating plans.

Power supplySelf-powered by temperature difference (thermoelectric when water temperature exceeds 45°C)

Compare all 4 models in this range →

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

● Quotes answered within one working day · UK support

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 Zero Heating & HVAC

Overview
Specifications

Description

The WT102 is a Milesight smart radiator thermostat — loRaWAN smart radiator thermostat (TRV), self-powered by thermal energy harvesting.

Key features

LoRaWAN smart radiator thermostat (TRV), self-powered by thermal energy harvesting
NTC temperature sensing, +/-0.5C accuracy across -20C to 60C
Stepping-motor valve actuator, fits M30x1.5mm radiator valve fittings
Up to 8 programmable heating schedules, freeze protection, open-window detection
LED display; Type-C port for off-season charging / external NTC sensor

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

Additional information

Weight	0.17 kg

WT102-868M specifications

Protocol	LoRaWAN®
Frequency	IN865/RU864/EU868/US915/AU915/KR920/AS923-1&2&3&4
Tx power	16 dBm (868 MHz) / 22 dBm (915 MHz)
Sensitivity	-137 dBm
Mode	OTAA/ABP, Class A / Class B
Actuator	Stepping motor
Default valve fitting	M30 × 1.5 mm
Supported metal adapters	RA, RAV, RAVL, Giacomini, M28 (Comap, Herz, TA, Markaryd), customizable
Temperature sensor	NTC, range -20°C ~ 60°C, accuracy ±0.5°C (0°C ~ 50°C), resolution 0.1°C
Heating plans	Up to 16 heating plans within one preset date period
Control features	Automatic temperature control, valve opening control, freeze protection, open-window detection, effective stroke
Display	LED display with white light, direction-adjustable
Buttons	1 × power/reset button, 2 × temperature/valve opening control buttons
USB	1 × Type-C for power supply, charging or external NTC sensor connection
Configuration	NFC via mobile app or downlink
Software features	Child lock, external sensor mode, data storage (1,000 entries), data retransmission, data retrievability, multicast, FUOTA
Power supply	Self-powered by temperature difference; or 5V by USB Type-C port
Operating temperature	-20°C ~ 60°C
Relative humidity	0% - 95% (non-condensing)
Ingress protection	IP30
Dimensions	50 × 60 × 101.9 mm
Material & colour	PC + aluminium, white & silver
Installation	Latching on the valve
Approvals	CE, FCC; RoHS

Specifications taken from the manufacturer datasheet.

Which version do I need?

The -868M suffix is the EU868 band version, which is the one a UK buyer needs; Tx power at 868 MHz is 16 dBm. Note the datasheet's frequency list for WT102 does not include CN470.

Typical applications for the WT102-868M

Smart heating control in commercial buildings
Domestic radiator control
Schedule-based heating in offices and public buildings
Freeze protection in unoccupied rooms
Room-sensor-based control paired with the WT401 wireless thermostat
Energy management retrofits on existing radiators

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 WT102-868M 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

Products that work with this one — connect it, power it, and get it online.

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

Milesight UG56 Industrial LoRaWAN Gateway
UG56 Price range: £173.58 through £213.98 ex VAT (£208.30 – £256.78 inc. VAT)
Select options This product has multiple variants. The options may be chosen on the product page
Milesight LoRaWAN Starter Kit — Gateway + 3 Environmental Sensors
KIT-LORA-STARTER £619.49 ex VAT (£743.39 inc. VAT)
Add to basket
Milesight UG63 Mini LoRaWAN® Gateway
UG63 Price range: £98.76 through £131.68 ex VAT (£118.51 – £158.02 inc. VAT)
Select options This product has multiple variants. The options may be chosen on the product page
Milesight Smart Building Occupancy Kit — Occupancy + Air Quality + Gateway
KIT-OCCUPANCY £531.21 ex VAT (£637.45 inc. VAT)
Add to basket

WT102-868M — frequently asked questions

Does WT102 need batteries?

No. It is self-powered by temperature difference — the datasheet notes that when water temperature exceeds 45°C the device is powered via the thermoelectric effect, eliminating battery replacement and wired power. A USB Type-C port provides 5V supply or charging.

Which radiator valves does it fit?

The default valve fitting is M30 × 1.5 mm. Metal adapters are supported for RA, RAV, RAVL, Giacomini and M28 (Comap, Herz, TA, Markaryd), and further adapters are customizable.

Can it control to room temperature rather than valve temperature?

Yes. It supports an external NTC sensor connected through the USB Type-C port, and it can work with the WT401 wireless thermostat for remote linkage control.

How does it avoid heating a room with an open window?

It supports open-window detection, plus freeze protection for low-temperature conditions. The datasheet notes abnormal temperature difference and extremely low temperatures trigger it quickly to adjust the valve opening.

Is it suitable for public buildings where people may tamper with it?

It supports a child-lock feature for tamper protection in public areas, and theft-deterring accessories are available for structural anti-theft protection.

How many heating schedules can it store?

Up to 16 heating plans within one preset date period, with 1,000 entries of local data storage plus data retransmission and retrievability.

How much does the Milesight WT102 Smart Radiator Thermostat cost in the UK?

The Milesight WT102 Smart Radiator Thermostat is £97.26 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 WT102 Smart Radiator Thermostat?

The Milesight WT102 Smart Radiator 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.