1. Introduction and Overview
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Ariston ANDRIS LUX 15L Under-Sink Electric Water Heater. Designed for compact spaces, this 2000W unit delivers hot water quickly and efficiently, making it ideal for isolated water points such as sinks or washbasins.
The Ariston ANDRIS LUX is engineered for durability and performance, featuring a robust design, high-quality components, and advanced insulation to minimize heat loss and reduce energy consumption.

Image 1.1: Ariston ANDRIS LUX 15L Under-Sink Electric Water Heater, highlighting its 15L capacity, under-sink installation style, Class B energy efficiency, ultra-fast heating (29 minutes), and Italian manufacturing.
2. Safety Information
Please read all safety instructions carefully before installation and use. Failure to follow these instructions may result in property damage, personal injury, or death.
- Electrical Safety: Ensure the unit is properly grounded. Do not operate with damaged cords or plugs. Disconnect power before any maintenance or service.
- Water Pressure: Do not operate the water heater without proper water supply. Ensure adequate water pressure is maintained.
- Installation: Installation must be performed by a qualified professional in accordance with local regulations and this manual.
- Temperature: Hot water can cause severe burns. Exercise caution when adjusting temperature and using hot water.
- Children and Vulnerable Persons: This appliance is not intended for use by persons with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
3. Package Contents
Verify that all components are present in the packaging before beginning installation:
- Ariston ANDRIS LUX 15L Electric Water Heater
- Instruction Manual (this document)
- Energy Label
- Kit of Screws and Wall Plugs (ref: 65117972)
- Pre-wired Power Cable (ref: 571395)
- Wall Mounting Bracket (ref: 570341)
- Insulating Connectors and Gaskets (ref: 65116403)

Image 3.1: Visual representation of the Ariston ANDRIS LUX water heater and its included installation accessories: instruction manual, energy label, dielectric connectors & gaskets, screws & wall plugs, and wall mounting bracket.
4. Setup and Installation
The Ariston ANDRIS LUX 15L is designed for under-sink installation. Its compact dimensions allow for flexible placement in small spaces. Professional installation is highly recommended.
4.1 Mounting
- Choose a suitable location under the sink, ensuring sufficient clearance for maintenance and connections.
- Use the provided wall mounting bracket and screws/plugs to securely fasten the unit to a solid wall. Refer to the dimensions diagram for precise measurements.
4.2 Water Connections
- Connect the cold water inlet and hot water outlet pipes to the corresponding ports on the water heater.
- Utilize the provided insulating connectors and gaskets to prevent galvanic corrosion and ensure a watertight seal.
- Install a pressure relief valve on the cold water inlet, as required by local plumbing codes.
- Once connections are made, slowly open the cold water supply valve to fill the tank. Open a hot water tap in your sink to allow air to escape until water flows steadily.
4.3 Electrical Connection
- Ensure the main power supply is off before making any electrical connections.
- Connect the pre-wired power cable to a dedicated, properly grounded electrical outlet or junction box. The unit operates at 2000W.
- Verify all electrical connections are secure and comply with local electrical codes.

Image 4.1: An Ariston ANDRIS LUX water heater neatly installed under a sink, demonstrating its compact design and ease of integration into bathroom or kitchen spaces. The image also highlights 'Easy Installation' and '2 Years Warranty' icons.

Image 4.2: Technical drawing showing the dimensions of the Ariston ANDRIS LUX 15L under-sink water heater, with measurements of 360mm (width), 360mm (height), and 346mm (depth).
5. Operating Instructions
The Ariston ANDRIS LUX water heater is designed for simple and intuitive operation.
5.1 Powering On
After successful installation and filling the tank with water, switch on the main electrical supply to the unit. The water heater will begin heating automatically if the temperature is below the set point.
5.2 Temperature Adjustment
The water heater features a manual temperature control knob located on the front panel. Rotate the knob to adjust the desired water temperature. The 'MAX' setting provides the highest temperature.
5.3 Heating Indicator
A red heating indicator light on the front panel illuminates when the unit is actively heating water. It will turn off once the set temperature is reached.

Image 5.1: Front view of the Ariston ANDRIS LUX water heater, showing the central temperature control knob with 'MIN' to 'MAX' settings and the red 'HEATING' indicator light below it.

Image 5.2: Close-up of the Ariston ANDRIS LUX control panel, illustrating the manual temperature adjustment dial and the red heating indicator light. A red arrow points to the heating indicator, stating 'Red light = in progress'.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your Ariston ANDRIS LUX water heater.
6.1 Anti-Corrosion Protection
The unit features an enameled steel tank and a magnesium anode for enhanced anti-corrosion protection. The magnesium anode should be inspected periodically (e.g., annually) and replaced if significantly depleted, especially in areas with hard water.
6.2 Anti-Limescale Resistance
The shielded heating element is designed to resist limescale buildup. However, in hard water areas, periodic descaling may be necessary to maintain heating efficiency. This procedure should be performed by a qualified technician.
6.3 Access for Maintenance
Maintenance is facilitated by the front flange opening, providing easy access to internal components such as the heating element and thermostat.

Image 6.1: A cutaway diagram of the Ariston ANDRIS LUX water heater, illustrating its internal structure. Key features highlighted include the enameled tank and magnesium anode for anti-corrosion, the shielded 2000W heating element, and the front access for easy maintenance.
7. Troubleshooting
If you encounter issues with your water heater, refer to the following common problems and solutions. For complex issues, contact qualified service personnel.
- No Hot Water:
- Check if the power supply is on.
- Ensure the temperature setting is not at 'MIN'.
- Verify the circuit breaker has not tripped.
- Insufficient Hot Water:
- Increase the temperature setting.
- Allow more time for the unit to heat the water, especially after heavy use.
- Check for excessive limescale buildup on the heating element (requires professional inspection).
- Water Leaks:
- Immediately turn off the water supply and electrical power.
- Inspect connections for loose fittings or damaged gaskets.
- If the leak is from the tank itself, contact customer support.
- Unusual Noises:
- Minor noises during heating are normal.
- Loud popping or rumbling sounds may indicate excessive sediment buildup in the tank (requires professional flushing).
8. Specifications
| Feature | Specification |
|---|---|
| Brand | Ariston |
| Model Name | ANDRIS LUX |
| Model Number | 3100324 |
| Capacity | 15 Liters |
| Power (Wattage) | 2000W |
| Voltage | Not explicitly stated, typically 230V for EU |
| Energy Efficiency Class | B |
| Dimensions (L x W x H) | 34.6 x 36 x 36 cm (Product); 36 x 76.2 cm (Product dimensions from another spec) |
| Weight | 8.5 Kilograms |
| Material | Alloy Steel (Tank) |
| Color | Black / White |
| Installation Type | Under-sink (Mural / Wall-mounted) |
| Heating Element | Shielded resistance |
| Corrosion Protection | Enameled tank, Magnesium anode |
9. Warranty and Support
9.1 Warranty Information
The Ariston ANDRIS LUX 15L Electric Water Heater comes with a 3-year warranty on the tank and a 2-year warranty on parts. This warranty covers manufacturing defects under normal use and service. Please retain your proof of purchase for warranty claims.
9.2 Customer Support
For technical assistance, warranty claims, or to purchase spare parts, please contact Ariston customer service or visit the official Ariston website. You can find contact details on the product packaging or the Ariston brand store on Amazon.
Ariston Brand Store: Visit the Ariston Store on Amazon