---
title: Installing a thermostat
description: "## Introduction Qilowatt supports smart thermostats that help automate heating control. To install a thermostat, it must be connected to the power supply, configured on its display, and linked with the Qilowatt app. ## Prerequisites • Power supply must be…"
url: "https://docs.qilowatt.eu/en/docs/installing-a-thermostat/"
updated: "2025-09-04"
category: Installation
tags:
  - control
  - device setup
  - installation
  - smart device
  - thermostat
---

# Installing a thermostat

## Introduction

 Qilowatt supports smart thermostats that help automate heating control. To install a thermostat, it must be connected to the power supply, configured on its display, and linked with the Qilowatt app.

## Prerequisites

 • Power supply must be turned off during installation
• Old thermostat is ready for removal
• New Qilowatt-compatible thermostat and temperature sensor are available
• Required tools (screwdriver, etc.)
• Optional: a Qilowatt account is created and the app is ready for linking → [Creating a user account](https://docs.qilowatt.eu/en/docs/creating-a-user-account/)

## Step-by-step Guide

### Installation

 **1.** The package includes the **control unit** and a **waterproof temperature sensor.** Suitable for a standard junction box with at least 25 mm depth (see dimension diagram).
**2.** Remove the thermostat screen from the frame: hold the screen and push the frame part about 5 mm downwards. Disconnect the cable connecting the two parts.
**3.**Connect the wires according to the scheme:
• 1 – heating element phase*
• 2 – heating element neutral*
• 3 – mains neutral
• 4 – mains phase
(* polarity is usually not important)
**4.**Pay attention to:
• Stranded wire ends must be crimped or soldered.
• For loads over 2000 W, the wire cross-section must be at least 2.5 mm².
• The heating device must be grounded.
**5.** Maximum allowed load: 16 A (approx. 3500 W at 230 V).
**6.**Install the thermostat into the junction box, connect the screen cable, and press the screen back into place.
 ![](https://docs.qilowatt.eu/wp-content/uploads/2025/08/ME81H_connection_schema-259x300-1.webp)

### Display indicators and basic settings

 • **Time, weekday, and current temperature** are shown at the top.
• **Period, target temperature, operating mode, child lock** – indicated by icons on the display.
• **The heating element indicator** shows when the element is powered.

**Setting the time:**
1. Tap the clock icon → hours start blinking → adjust with arrow buttons.
2. Tap again → set minutes.
3. Tap a third time → select weekday.
4. Tap a fourth time → save the setting.

### Operating modes

 • **Manual mode** (hand icon) – press M until the hand icon appears, then set the desired temperature with arrow keys.
• **Automatic mode** (clock icon) – activates according to preset schedules.
To change presets: turn the device off, hold **M** and the clock button for 5 seconds.
Adjust values with arrows, move to next field with M. ![](https://docs.qilowatt.eu/wp-content/uploads/2025/08/Screenshot-2025-08-04-at-23.20.29.webp)

### Protection functions

 • **Anti-freeze protection**: turns heating on below 5 °C and off above 7 °C.
• **Overheat protection**: activates by default at 60 °C.

### Advanced settings

 **•**Turn the device off, then hold **M** and the **down arrow** simultaneously.
**•**Allows adjusting device parameters and running initial setup.
**•**Exit the menu with the power-off button. ![](https://docs.qilowatt.eu/wp-content/uploads/2025/08/Screenshot-2025-08-04-at-23.21.28.webp)

### Linking the thermostat with the Qilowatt app

 • Open the [Qilowatt app](https://app.qilowatt.it).
• Add the device following the guide → [Connecting the device to WiFi.](https://docs.qilowatt.eu/en/docs/connecting-the-device-to-wifi/)
• Once linked, the thermostat can be controlled remotely according to schedules and temperatures set in the app.

## Result

 The thermostat is installed and configured. It can operate in both manual and automatic modes and can be linked with the Qilowatt app for remote control.

## If it Doesn't Work

 • Check that the wires are connected correctly and grounding is in place.
• If the screen does not light up, make sure the power supply is on.
• If the Qilowatt app does not detect the device, follow the guide → [Connecting the device to WiFi.](https://docs.qilowatt.eu/en/docs/connecting-the-device-to-wifi/)
• If the issue persists, contact our team: [support@qilowatt.eu](mailto:support@qilowatt.eu).