Quick Summary
HTW-HT09B-3ANV3 is a WiFi Water and Boiler Heating Thermostat for water and boiler systems. It controls heating output using relay switching and dry contact. The unit supports NC, NO, and COM terminals for flexible connection. WiFi allows remote adjustment through mobile application for daily operation.
This page explains how the WiFi Water and Boiler Heating Thermostat works in projects. It covers control logic, wiring method, and parameter setup. It also explains model configuration and customisation options. Typical questions and answers are included for quick reference.

Key Features
(This section explains the core control functions and their practical value.)
01 Dual Output Heating Control
The WiFi Water and Boiler Heating Thermostat supports 2x3A load outputs with NC, NO, and COM terminals. It also includes dry contact for boiler control. This allows flexible connection for different heating system layouts.
02 Stable Temperature Regulation
The thermostat uses sensor feedback to control heating output based on setpoint. It reduces temperature fluctuation during operation. This helps maintain stable room comfort and improves system reliability.
03 WiFi Remote Operation
WiFi allows remote control through mobile application for temperature adjustment. Users can manage settings without local access. This improves flexibility in daily use and simplifies control in multi-room projects. We have a related standalone model HTW-HT09B-3ANV1.
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 | 100~240Vac |
| Frequency | 50/60Hz |
| Accuracy | ±0.5°C |
| Sensor | NTC3950, 10K |
| Setpoint Range | 5~35°C |
| Display Range | 5~99°C |
| Material | PC + ABS (Fireproof) |
| Protection Class | 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 |
| 16A | Electric Underfloor Heating, with L+N line voltage output terminals + External Sensor |
| NV | Boiler Heating, with Non-Voltage Dry Contact |
| 3 | 3 = Wi-Fi |
| Example HTW-HT09B-xx: if xx = 3ANV3, it stands for water heating and boiler control with 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 and Boiler Heating Thermostat is not suitable for electric floor heating systems. It does not support fan coil control. It is not designed for complex BMS protocols like Modbus. It works for water heating and boiler systems only.
Despite these limits mentioned above, ODM customisation can be discussed. Communication method or app functions may be adjusted. Control logic or output configuration can be adapted based on project needs. Final solution depends on technical evaluation.
OEM services are available for branding and appearance changes. Logo printing, colour options, and label design can be supported. Packaging and interface adjustments may also be arranged for bulk orders.
Certificates and Compliance


Frequently Asked Questions
Q1. What systems does this WiFi Water and Boiler Heating Thermostat support?
It supports water heating systems and boiler control using relay outputs and dry contact, suitable for different indoor heating applications.
Q2. How is the thermostat wired in installation?
It connects to power supply and output terminals including NC, NO, COM, and dry contact for boiler connection based on system design.
Q3. Can I control it remotely through mobile app?
Yes, WiFi allows remote control through mobile application, enabling users to adjust temperature and monitor system without direct access.
Q4. What is the MOQ and can I order samples?
We support sample orders. Standard MOQ is 300 units, but smaller trial quantities such as 100 units can also be discussed.
Q5. How can I place an order?
Please contact us to confirm requirements. We will provide a proforma invoice. Payment supports TT, PayPal, Visa, and terms like EXW, FOB, or DAP.
Q6. How will the products be shipped?
Courier delivery is recommended and takes about 7 days. Air shipping also takes around 7 days, while sea freight usually takes over one month.
Related Thermostat Models
If you are comparing models or selecting alternatives, please contact us. We can help match suitable thermostats based on your project needs.
You can refer to below links:
Electric Underfloor Heating Thermostat
Water Underfloor Heating Thermostat
Final Note / Practical Takeaway:This WiFi Water and Boiler Heating Thermostat provides stable control with remote access. It supports flexible wiring and suits projects needing reliable and simple heating management. [More models: heating thermostat]





