1. Introduction
This user manual provides essential information for the safe and efficient operation, installation, and maintenance of your Ariston HS Premium 24 EU condensing wall-mounted boiler. This appliance is designed to provide both central heating and domestic hot water. Please read this manual thoroughly before attempting any installation, operation, or maintenance procedures. Retain this manual for future reference.
2. Safety Information
Important Safety Instructions:
- Installation, maintenance, and repair must only be carried out by qualified and authorized personnel in accordance with local regulations and standards.
- Do not attempt to modify the appliance or its components. Unauthorized modifications can be dangerous and will void the warranty.
- Ensure adequate ventilation in the area where the boiler is installed.
- If you smell gas, immediately shut off the gas supply, open windows and doors, and contact a qualified technician. Do not operate electrical switches or use any open flames.
- Keep flammable materials away from the boiler.
- Regularly check the system pressure as indicated in the operating section.
3. Product Overview

Figure 1: Ariston HS Premium 24 EU Condensing Wall-Mounted Boiler
The Ariston HS Premium 24 EU is a high-efficiency condensing boiler designed for domestic heating and hot water production. Its compact, white casing allows for discreet wall-mounting. The appliance features a user-friendly digital control panel located at the bottom front, providing access to operational settings and system status indicators. This model (Part Number: 3300761) utilizes methanegas condensation technology for optimal energy efficiency.
4. Setup and Installation
Professional Installation Required: The installation of the Ariston HS Premium 24 EU boiler must be performed by a qualified and certified heating engineer. Incorrect installation can lead to serious hazards, including gas leaks, carbon monoxide poisoning, and fire, and will invalidate the product warranty.
The installer will ensure:
- Correct positioning and mounting of the boiler.
- Proper connection to the gas supply, water supply (cold and hot), and heating system.
- Installation of the flue system for safe exhaust of combustion products.
- Electrical connections are made according to safety standards.
- The system is filled with water and purged of air.
- Initial commissioning and testing of the boiler's functions.
Refer to the detailed installation manual provided with the product for specific technical requirements and diagrams.
5. Operating Instructions
5.1. Powering On/Off
- To Power On: Ensure the gas supply valve is open and the electrical supply to the boiler is switched on. The boiler will typically perform a self-check and display its current status.
- To Power Off: Switch off the electrical supply to the boiler at the dedicated isolation switch. For extended periods of inactivity, also close the main gas supply valve to the appliance.
5.2. Adjusting Heating Temperature
Use the control panel buttons (usually marked with '+' and '-') to adjust the desired central heating temperature. The current setting will be displayed on the digital screen. Consult your installer or the full product manual for specific button functions.
5.3. Adjusting Domestic Hot Water Temperature
Similar to heating, dedicated buttons on the control panel allow you to set the desired temperature for domestic hot water. Avoid excessively high temperatures to prevent scalding and reduce energy consumption.
5.4. System Pressure
The boiler's digital display will show the system pressure. Maintain the pressure within the recommended range, typically between 1.0 and 1.5 bar when the system is cold. If the pressure drops below the minimum recommended level, consult the troubleshooting section or contact a qualified technician for repressurization.
6. Maintenance
Regular maintenance is crucial for the safe, efficient, and long-lasting operation of your Ariston boiler. Failure to perform regular maintenance may void your warranty and could lead to unsafe operating conditions.
- Annual Service: It is highly recommended to have your boiler serviced annually by a qualified heating engineer. This service typically includes checking for leaks, cleaning components, verifying combustion efficiency, and ensuring all safety devices are functioning correctly.
- Visual Inspection: Periodically check the boiler for any visible signs of damage, leaks, or unusual noises.
- System Pressure Check: Regularly monitor the system pressure on the boiler's display.
- Cleaning: Keep the exterior of the boiler clean using a soft, damp cloth. Do not use abrasive cleaners or solvents. Ensure that the air vents are not obstructed.
7. Troubleshooting
This section provides guidance for common issues. For complex problems or if you are unsure, always contact a qualified heating engineer.
- No Heating or Hot Water:
- Check if the boiler is powered on and the gas supply is open.
- Verify the system pressure is within the recommended range (1.0-1.5 bar).
- Check the thermostat settings and ensure it is calling for heat.
- Look for any error codes on the boiler's display and refer to the full manual for their meaning.
- Low System Pressure:
- If the pressure drops below 1.0 bar, the system may need repressurizing. This procedure should ideally be performed by a qualified person. Refer to the full manual for instructions or contact your installer.
- Unusual Noises:
- Gurgling or banging noises can indicate air in the system or low pressure. Bleed radiators if necessary and check system pressure.
- Persistent or loud noises require immediate attention from a qualified technician.
- Leakage:
- If you observe any water leakage, immediately switch off the boiler and close the water supply valves. Contact a qualified technician without delay.
8. Specifications
| Feature | Specification |
|---|---|
| Model Number | HS Premium 24 EU |
| Part Number | 3300761 |
| Brand | Ariston |
| Type | Condensing Wall-Mounted Boiler |
| Fuel Type | Methanegas |
| Power Output (Thermal) | 23.5 kW (for heating and domestic hot water) |
| Item Weight | 35 kg |
| Electrical Power Consumption | 87 watts |
| Heat Output (from specifications) | 87 Kilowatt (Note: This value appears inconsistent with the boiler's stated thermal power output of 23.5 kW. Please refer to official Ariston documentation for accurate thermal output.) |
| Batteries Required | No |
Note: Specifications are subject to change. Always refer to the official product documentation for the most accurate and up-to-date information.
9. Warranty and Support
For information regarding the warranty period and terms for your Ariston HS Premium 24 EU boiler, please refer to the warranty card included with your product or contact your installer/supplier. Warranty conditions typically require professional installation and annual servicing by a qualified technician.
For technical support, spare parts, or to schedule a service, please contact your authorized Ariston service center or the installer who fitted your boiler. Always provide the model number (HS Premium 24 EU) and part number (3300761) when seeking assistance.
You can find contact information for Ariston support on the official Ariston website or through your local distributor.





