Quick Summary
HTW-HT09-3ANV3 is a WiFi water heating boiler heating thermostat designed for water heating and boiler systems. It supports relay outputs and non-voltage dry contact control for boiler switching. The thermostat measures room temperature using an NTC sensor. This WiFi water heating boiler heating thermostat enables remote control through a mobile application.
This page explains how the WiFi water heating boiler heating thermostat works in real projects. It introduces control functions, wiring reference and key technical parameters. Model configuration meaning and project customisation possibilities are also explained. Typical installation questions and practical usage guidance are included.

Key Features
(This section explains the core control functions and their practical value.)
01. WiFi Remote Heating Control
The WiFi water heating boiler heating thermostat connects to a mobile application platform. Users can adjust temperature settings remotely through smartphones. This improves convenience in residential and small commercial heating environments. We have another related standalone model HTW-HT09-3ANV1.
02. Dual Output Control Structure
This WiFi Water Heating Boiler Heating Thermostat supports both relay outputs and dry contact signals. This allows flexible connection to water heating systems and boilers. It improves compatibility across different heating installation types.
03. Multilingual Application Support
The application supports forty-seven commonly used languages. Users can operate the thermostat easily in different regions. This improves usability in global HVAC distribution projects.
Product Design and Display
(This section shows the product’s dimensions and the interface layout.)


Technical Specifications
(This section lists the key parameters for reference and project confirmation.)
| Parameter | Value |
|---|---|
| Power Supply | 95~240Vac |
| Frequency | 50/60Hz |
| Accuracy | ±0.5°C or ±1°F |
| Sensor | NTC3950, 10K |
| Setpoint Range | 5~35°C |
| Display Range | 5~99°C |
| Installation | EU or Standard Electric Box Housing |
| Material | PC + ABS (Fireproof), IP20 |
Wiring Diagram
(This section provides the wiring reference diagram for correct installation.)

Model Code Guide
(This section explains what configuration the model code refers to.)
| Heating series | xx stands for |
|---|---|
| 3A | Water Heating, with NC+NO+COM output terminals |
| NV | Boiler Heating, with Non-Voltage Dry Contact |
| 3 | 3 = Wi-Fi |
| Example | HTW-WF11-xx: if xx = 16A3, it stands for electric floor heating with external sensor support and Wi-Fi function. Most sub-models are ready-made. Kindly contact us to confirm availability. |
Project Fit & Customization
(This section explains where the product can be used, its limits, and OEM/ODM options.)
This WiFi Water Heating Boiler Heating Thermostat is not suitable for large building automation systems requiring Modbus or BACnet communication. It does not support direct BMS integration or complex control networks. Projects needing central control platforms should select communication-enabled thermostat models.
The product relies on stable WiFi connection for remote control functions. Installations without reliable network access will limit application control features. Offline-only projects may prefer standalone thermostat versions.
Despite these limits mentioned above, functional adjustments may still be discussed. Control logic or interface behaviour may be modified depending on project requirements. However, all changes depend on technical feasibility and order quantity. OEM customisation such as logo printing and packaging is supported.
Certificates and Compliance

Certification documents for Swan Controls thermostats

Swan Controls presenting thermostats at an international HVAC exhibition
Frequently Asked Questions
Can this WiFi water heating boiler heating thermostat work with both systems?
Yes. It supports relay output and dry contact control. This allows connection to both water heating systems and boiler control circuits.
Can the thermostat be controlled remotely through a mobile application?
Yes. The WiFi water heating boiler heating thermostat connects through an application platform. Users can adjust temperature and monitor heating status remotely.
Does this thermostat support BMS communication protocols?
No. This model is designed for WiFi-based control. Projects requiring Modbus or BACnet integration should select other thermostat versions.
What is the minimum order quantity and are samples available?
Thermostat samples are available for testing. The typical minimum order quantity is about 300 units, though smaller trial quantities may be discussed.
How can I place an order?
Please contact us to confirm project requirements. A proforma invoice will be provided. Payment methods include TT, PayPal and Visa, with EXW, FOB or DAP terms.
How are the products shipped?
Express delivery is usually recommended and takes about seven days. Air freight is similar, while sea freight typically requires about one month depending on destination.
Need Support?
If you need help selecting other heating thermostats, please contact us. Our team can support your project planning and application requirements. Or you can refer to below links:
Electric Underfloor Heating Thermostat
Water Underfloor Heating Thermostat
Final Note / Practical Takeaway:This WiFi water heating boiler heating thermostat provides reliable boiler control and remote temperature adjustment. It is suitable for indoor projects requiring simple and effective heating management.[More details: heating thermostat]





