PNI CT25W WiFi Smart Thermostat for Boiler, 16A, Tuya Smart, Flush Mount

Description

PNI CT25W WiFi Smart Thermostat for Boilers and Heating Systems

The PNI CT25W WiFi smart thermostat is an intelligent temperature control solution designed for gas boilers, water underfloor heating systems, circulation pumps and other compatible heating equipment.
With its elegant white glass-effect front panel and flush-mounted design, it integrates neatly into your home while providing convenient control of your heating system.

Thanks to integrated WiFi connectivity, the thermostat can be operated directly from its touch-sensitive controls or remotely through the Tuya Smart / Smart Life mobile application.
With an Internet connection, you can monitor the room temperature, switch the heating on or off, adjust the target temperature and manage heating schedules from virtually anywhere.

Smart Heating Control from Your Smartphone

The PNI CT25W connects to your home wireless network using 2.4 GHz WiFi and communicates with the Tuya Smart / Smart Life application.
This allows you to manage your heating system remotely without having to be physically present at home.

Using the mobile application, you can:

• Switch the heating system on or off remotely.
• Monitor the current room or floor temperature, depending on the selected sensor.
• Adjust the desired temperature.
• Create and modify weekly heating schedules.
• Switch between manual and automatic operating modes.
• Activate or deactivate the child lock.
• Adjust temperature compensation and temperature limits.
• Change the display brightness settings.

Remote control requires an active Internet connection for the thermostat and the smartphone. The thermostat can also be operated locally using its integrated controls.

Weekly Programming and Manual Operation

The PNI CT25W offers two main operating modes: Automatic and Manual.

In Automatic mode, you can configure a weekly heating schedule according to your daily routine. The manufacturer’s product information specifies up to four heating periods per day, while the accompanying manual describes six daily program slots.
The schedule can be managed through the thermostat or the Tuya Smart application.

In Manual mode, the thermostat maintains the selected temperature continuously, without following the programmed schedule.
This is useful when you want to temporarily override the automatic program or maintain a constant temperature for an extended period.

The weekly schedule can be divided into three groups: Monday–Friday, Saturday and Sunday, allowing different heating settings for working days and weekends.

Room Temperature and Optional Floor Sensor

The thermostat features an integrated air temperature sensor and an additional input for an external wired floor temperature sensor.
This makes the PNI CT25W suitable for different heating configurations, including compatible water underfloor heating systems.

When an external floor sensor is connected, you can select which sensor the thermostat uses for temperature control:

• Room temperature control: the heating system operates according to the temperature measured by the thermostat’s integrated air sensor.
• Floor temperature control: the heating system operates according to the temperature measured by the external floor sensor.

By default, the thermostat displays the room temperature measured by its internal sensor.
The external floor sensor is an optional accessory and is not included in the standard package.

Adjustable Temperature and Operating Parameters

The thermostat allows you to configure the desired temperature, temperature compensation, upper and lower temperature limits and hysteresis.
These settings help adapt the heating control to the characteristics of the installation and the user’s preferences.

The temperature setting increment is 0.5°C. The measured temperature is also displayed in 0.5°C increments.
The hysteresis is specified as 0.5°C in the manufacturer’s user manual.

Backlit Display and Touch Controls

The PNI CT25W features a modern backlit display with touch-sensitive controls.
The screen provides information about the current room temperature, selected temperature, time, day of the week, operating mode, heating status and WiFi connection.

The display brightness can be configured according to your preferences. You can choose to switch the screen off after 30 seconds, reduce its brightness automatically or keep it illuminated continuously.

Child Protection Function

The integrated child lock prevents accidental changes to the thermostat settings.
Once activated, the key lock indicator appears on the display, helping protect the selected temperature and operating parameters from unwanted adjustments.

Flush-Mounted Installation and 16A Relay Output

Unlike portable wireless thermostats, the PNI CT25W is designed for permanent, flush-mounted installation in a suitable wall electrical box.
Its compact dimensions of approximately 86 × 86 mm allow it to integrate neatly into the interior of your home.

The thermostat is powered directly from the electrical supply and features a potential-free relay (dry contact) with a maximum switching capacity of 16A, suitable for compatible heating control applications.

It can be used with compatible residential gas boilers, water underfloor heating systems, water pumps and other heating equipment.
Compatibility must be verified against the electrical requirements and control input of the particular heating system.

Important: The thermostat operates from a mains electrical supply. Installation, wiring and connection to the heating equipment must be carried out exclusively by qualified personnel, in accordance with the manufacturer’s wiring diagram and applicable electrical regulations.

Technical Specifications

Documentation

• Declaration of Conformity
• User Manual (PDF)

Replacement for Traditional Mechanical Timers and Programmers

The PNI CT25W WiFi smart thermostat can also be considered as a modern replacement for many traditional mechanical or electromechanical heating timers and programmable thermostats used with gas boilers. It may be a suitable upgrade for older devices, including certain Seitron models such as the Freetime Plus and Magictime, depending on the original installation and wiring configuration.

Its potential-free (volt-free) dry relay contacts allow the thermostat to control compatible boiler inputs in the same basic on/off switching manner as a conventional room thermostat or timer. Instead of relying on a traditional mechanical time-switch, the CT25W offers programmable heating schedules, manual operation and remote control through the Tuya Smart / Smart Life app.

Important: Compatibility must be checked before replacing an existing timer or thermostat. The boiler or heating controller must accept a compatible potential-free contact, and the electrical connections, relay ratings and installation requirements must be verified. The CT25W is not a universal plug-and-play replacement for every timer or boiler. We recommend having the wiring checked and the replacement installed by a qualified heating technician or electrician.

For reference, see the official Seitron Freetime Plus chronothermostat product page.

Product Video

This post is also available in: Italiano (Italian)