Heating Monitor

WiFi pressure monitoring device.

The Nautilis Heating Monitor is a smart WiFi monitoring device designed for heating systems, solid fuel boilers, buffer tanks, thermal storage tanks, and other installations where reliable temperature and pressure monitoring is essential.

Main features

WiFi connectivity
Supports one or two DS18B20 temperature sensors
Optional pressure sensor
Delta T calculation and display
Temperature and pressure alarms
Support for the Nautilis Monitoring Platform
Data transmission to supported cloud services
High and low temperature alarms
High and low pressure alarms
Built-in local web interface for easy configuration
TFT display with real-time data
Built-in audible alarm support

Gallery

Nautilis Heating Monitor

The Nautilis Heating Monitor is a smart WiFi device designed for monitoring heating systems, solid fuel boilers, buffer tanks, thermal storage tanks, and other installations where reliable temperature and pressure monitoring is essential.

The device can monitor one or two DS18B20 temperature sensors and an optional pressure sensor, making it ideal for measuring flow and return temperatures, boiler temperature, storage tank temperature, or system pressure.

When two temperature sensors are connected, the Heating Monitor automatically calculates and displays the Delta T value, showing the temperature difference between the flow and return lines.

Applications

Monitoring wood and pellet boilers
Monitoring buffer tanks
Measuring flow and return temperatures
Monitoring heating system pressure
Remote alarm notifications
Monitoring domestic hot water tanks
General temperature and pressure monitoring

Display

The built-in TFT display provides all essential information at a glance.

Depending on the configuration, the display can show:

Temperature Sensor 1
Temperature Sensor 2
Delta T value
System pressure
Alarm status
Device name
WiFi connection status
Cloud service connection status

Temperature Sensors

The Heating Monitor uses DS18B20 digital temperature sensors.

Each sensor can be individually configured with:

Minimum temperature limit
Maximum temperature limit
Measurement calibration (offset)

If a measured temperature exceeds the configured limits, the device activates an alarm and, if configured, sends a notification to a remote monitoring service.

Optional Pressure Sensor

The Heating Monitor can also be equipped with an optional pressure sensor.

Supported pressure units include:

The pressure sensor supports:

Minimum pressure limit
Maximum pressure limit
Sensor calibration

This allows early detection of pressure loss or excessive pressure within the heating system.

Delta T

When two temperature sensors are connected, the Heating Monitor automatically calculates the Delta T value.

Delta T represents the temperature difference between the flow and return lines and is one of the key indicators of heating system performance and efficiency.

Alarm System

Whenever a measured value exceeds the configured limits, the Heating Monitor can:

Display an alarm on the TFT screen
Activate the built-in audible alarm
Send data to the Nautilis Monitoring Platform
Trigger push notifications for remote alerts

This ensures you are immediately informed about critical changes in your heating system, whether you are at home or away.

First-Time Setup

Power on the device.
Connect to its WiFi access point.
Open a web browser and navigate to 192.168.4.1.
Open the Network & Cloud menu.
Enter your WiFi network name (SSID) and password.
Set Service Type to NAUTILIS (recommended) or choose another supported service.
For the NAUTILIS service, set the Custom Stream URI or Token to match the device's AP SSID.
Save the settings.
Turn the device off for approximately 10 seconds, then power it on again.

The device will then connect to your local WiFi network and begin monitoring the connected sensors.

Local Web Interface

The Heating Monitor features a built-in web interface accessible from your local network.

Using any web browser, you can configure:

WiFi settings
Device name
Data transmission service
Temperature units
Alarm limits
Sensor calibration
Audible alarm
Data transmission interval
Display settings

All settings are stored in the device's non-volatile memory and remain saved even after a power loss.

Nautilis Monitoring Platform

When NAUTILIS is selected as the service, the device automatically uploads data to the Nautilis Monitoring Platform.

The platform provides:

Live sensor readings
Historical data storage
Alarm monitoring
Push notifications
Remote monitoring of multiple devices

The current minimum data transmission interval is 60 seconds.

After logging in, users can:

View all assigned devices
Rename devices
Set device locations
Add personal notes
View charts and historical data
Export data in CSV format

Note: The Device ID is assigned by the administrator and is used to uniquely identify the device when sending data.

Push Notifications via Pushover

The Nautilis Monitoring Platform supports push notifications through the Pushover app, allowing you to receive instant alerts on your mobile device whenever an alarm condition occurs.

Setting Up Pushover Notifications

Install the Pushover app on your Android or iOS device.
Create a Pushover account and sign in.
Locate your User Key in the Pushover Dashboard.
Log in to the Nautilis Monitoring Platform.
Open your Profile page.
Paste your Pushover User Key into the appropriate field.
Enable Receive Pushover Notifications.
Save your changes.
Optionally click Test Push to verify the configuration.

If everything is configured correctly, a test notification will be delivered to your mobile device.

Push Notifications via Telegram

The Nautilis Monitoring Platform also supports alarm notifications through Telegram.

Telegram notifications are completely free and can be used either on their own or together with Pushover notifications.

Setting Up Telegram Notifications

Install the Telegram app on your Android or iOS device.
Sign in to your Telegram account.
Log in to the Nautilis Monitoring Platform.
Open your Profile page.
In the Telegram section, click Connect Telegram.
The platform will display a message similar to:
/start YOUR_CODE

Open the Nautilis Monitoring Bot in Telegram.
Send the displayed command (for example: /start A1B2C3D4).
If the connection is successful, the bot will confirm the registration.
Return to your Profile page and refresh it.
Enable Receive Telegram Notifications.
Save your changes.
Optionally click Test Telegram to verify the configuration.

If configured correctly, a test message will be delivered through Telegram.

From that point onward, you will receive alarm notifications for all devices assigned to your account.

All Telegram communication is private between you and the Nautilis Monitoring Bot. Other users cannot access your messages, alarms, or device information.

Alarm Notification Examples

Alarm T1 LOW – Temperature Sensor 1 below the configured minimum
Alarm T1 HIGH – Temperature Sensor 1 above the configured maximum
Alarm T2 LOW / HIGH – Temperature Sensor 2 alarm
Alarm T3 LOW / HIGH – Temperature Sensor 3 alarm
Alarm P LOW / HIGH – System pressure alarm

Users can enable both Pushover and Telegram notifications simultaneously. When both services are enabled, alarm notifications are sent through both channels.

Technical Specifications

Power supply: 5 V via USB-C
USB-C power adapter not included
WiFi: 2.4 GHz
5 GHz WiFi networks are not supported
Built-in TFT display with real-time data
Adjustable LED backlight
Supports both °C and °F temperature units