Vaillant miniVED H 3/3 Hydraulic Instantaneous Water Heater User Manual

1. Introduction and Product Overview

The Vaillant miniVED H 3/3 is a compact, hydraulically controlled instantaneous water heater designed to provide quick and efficient hot water for single washbasins, particularly suitable for guest bathrooms or small kitchens. This unit offers a convenient and energy-saving solution for on-demand hot water supply.

Key features include:

• Rapid and Economical Heating: Delivers warm water within seconds, ideal for handwashing.
• Functional Heating System: Equipped with a high-quality bare-wire heating system, a differential pressure switch, and a safety pressure switch for reliable operation.
• Compact Dimensions: Space-saving design ensures hot water comfort even for the smallest washbasins.
• Energy Efficiency: Can achieve up to 65% energy savings compared to small storage heaters when used with the included flow regulator.

Image: Front view of the Vaillant miniVED H 3/3 instantaneous water heater, showing its compact white casing with the Vaillant logo and "miniVED" branding.

2. Safety Instructions

Please read and understand all safety instructions before installation, operation, or maintenance of the Vaillant miniVED H 3/3. Failure to comply with these warnings and installation instructions may result in product damage or personal injury.

• Professional Installation: The appliance must be installed and connected by a qualified professional tradesperson to ensure adequate safety.
• Initial Commissioning - Venting: Before initial commissioning, the appliance must be thoroughly vented. To do this, open the water tap and let water run through the appliance until no more air escapes. Only then should the electrical connection be established.
• Pressure-Resistant Armature: The instantaneous water heater may only be operated with a pressure-resistant armature (2 connection hoses).
• Electrical Safety: Ensure the electrical supply matches the appliance's requirements (230V, 3.5 kW) and that proper grounding is in place. The unit is equipped with a Schuko plug.
• Water Temperature: Be aware that water temperature can vary based on inlet temperature and flow rate.

3. Setup and Installation

The Vaillant miniVED H 3/3 is designed for under-sink or wall-mounted installation. Due to the electrical and plumbing connections, installation must be performed by a qualified professional.

3.1. Pre-Installation Checks

• Verify that the installation location is suitable, providing adequate space and access for maintenance.
• Ensure the water supply lines are compatible and that a pressure-resistant armature with two connection hoses is available.
• Confirm the electrical circuit can support the 3.5 kW power requirement of the unit.

3.2. Mounting the Unit

The unit should be securely mounted in the desired position (under-sink or wall-mounted) using appropriate fasteners. Refer to the detailed mounting instructions provided in the separate installation manual for specific drilling templates and hardware requirements.

Image: Back view of the Vaillant miniVED H 3/3, illustrating the mounting points for secure installation and the integrated electrical cable with a Schuko plug.

3.3. Water and Electrical Connections

Connect the water inlet and outlet hoses to the appropriate fittings on the unit and the pressure-resistant armature. Ensure all connections are watertight. Once plumbing is complete, and before connecting to the electrical supply, perform the initial venting procedure as described in the Safety Instructions section (2).

Image: Schematic diagram illustrating the correct hydraulic connection of the instantaneous water heater to a sink, emphasizing the need for a pressure-resistant armature with two connection hoses.

After successful venting, plug the unit into a suitable 230V electrical outlet. The unit is now ready for operation.

4. Operating Instructions

The Vaillant miniVED H 3/3 operates automatically based on water flow. When the hot water tap is opened, the unit detects the water flow and instantly begins heating the water to the desired temperature.

4.1. Water Temperature and Flow Rate

The actual hot water temperature delivered by the miniVED H 3/3 depends on the inlet water temperature and the flow rate. The unit is designed to provide a comfortable warm water temperature for handwashing.

Image: Diagram showing approximate water output temperatures. In summer (inlet ~13°C), temperature can reach ~38°C. In winter (inlet ~8°C), temperature can reach ~33°C, both with a ~25°C temperature increase.

The miniVED H 3/3 has a flow rate dependent on its power, typically ranging from 2 to 3.2 liters per minute. For optimal energy efficiency, it is recommended to use the included flow regulator.

Image: Table detailing the flow rates for various miniVED H models. The miniVED H 3/3 (N) provides approximately 2.0 liters per minute.

4.2. Energy Saving Tips

• Utilize the included flow regulator to limit water consumption and maximize energy savings.
• Only open the hot water tap when warm water is genuinely needed.

5. Maintenance

Regular maintenance ensures the longevity and efficient operation of your Vaillant miniVED H 3/3. While the unit is largely maintenance-free, certain checks are recommended.

• Regular Cleaning: Clean the exterior of the unit with a soft, damp cloth. Do not use abrasive cleaners or solvents.
• Flow Regulator Cleaning: Periodically check and clean the flow regulator and faucet aerator for any mineral deposits or debris that might reduce water flow.
• Professional Inspection: It is advisable to have the unit inspected by a qualified professional every few years to check for internal scaling, electrical connections, and overall performance.
• Descaling: In areas with hard water, mineral deposits (limescale) can build up over time. If you notice a significant reduction in hot water flow or temperature, professional descaling may be required.

Note: There are no user-serviceable parts inside the unit. Any internal repairs or component replacements must be carried out by a qualified technician.

6. Troubleshooting

This section provides guidance for common issues you might encounter with your instantaneous water heater. For complex problems, always contact a qualified professional.

If the problem persists after attempting these solutions, please contact Vaillant customer support or a certified service technician.

7. Technical Specifications

Image: The Vaillant miniVED H 3/3 unit discreetly installed under a sink, demonstrating its compact size and suitability for small spaces.

8. Warranty and Support

For information regarding the product warranty, please refer to the warranty card included with your purchase or visit the official Vaillant website. Keep your proof of purchase for warranty claims.

For technical support, spare parts, or service inquiries, please contact Vaillant customer service. It is recommended to have the model number (0010044420) and serial number of your unit ready when contacting support.

You can find more information and contact details on the official Vaillant website: www.vaillant.de