The Bosch AQUA 4000 S is a water softening system for the domestic drinking water installation. It reduces water hardness and thus limescale deposits in pipes, fittings and connected appliances. You can choose the resin volume from the available options: 9, 14, 21 or 26 litres. The salt level is displayed on the unit and can be refilled via the filling opening.

Design and Features

• Four sizes: resin volume of 9, 14, 21 or 26 litres
• Salt level indicator: shows when salt needs to be refilled
• Control panel on the unit: settings are made directly on the unit
• Bosch HomeCom Easy: app connectivity can be retrofitted
• Manufacturer: Robert Bosch GmbH

Scope of Delivery

• 1x Bosch AQUA 4000 S water softening system in the selected size

Additional Requirements

• regeneration salt for ongoing use
• connection to the drinking water supply and a wastewater connection
• electrical connection at the installation site
• installation and commissioning by a specialist company

Technical Data

Manufacturer	Bosch, Robert Bosch GmbH
Series	AQUA 4000 S
Model	water softening system for the drinking water installation
AQ4000 S 9	resin volume 9 litres
AQ4000 S 14	resin volume 14 litres
AQ4000 S 22	resin volume 21 litres
AQ4000 S 26	resin volume 26 litres
Salt level indicator	on the unit
App connectivity	Bosch HomeCom Easy, retrofittable

Frequently Asked Questions

What does a water softening system do?

It reduces the hardness of the drinking water. This results in less limescale in pipes, fittings and connected appliances. The system is integrated into the drinking water installation and serves the entire house.

How do the four variants differ?

They differ in resin volume: 9, 14, 21 or 26 litres. The larger the volume, the more water can be softened between two regenerations. You can choose the variant from the available options.

Which variant is right for my household?

The size depends on the water demand in the house and the local water hardness. You can find out the water hardness from your water supplier. The specialist company will determine the appropriate design.

How do I know when salt needs to be refilled?

The unit has a salt level indicator. Salt is refilled via the filling opening on the unit.

Can the system be connected to an app?

Connectivity to the Bosch HomeCom Easy app can be retrofitted. By default, the system is operated using the control panel on the unit.

Where is the system installed?

In the drinking water installation, usually after the water meter. A wastewater connection and an electrical connection are required at the installation site.

Can I install the system myself?

No. Installation involves working on the drinking water system and must be carried out by a specialist company, which will also handle commissioning and setting up the system.