# Water softener VIESSMANN AquaStilla 12, model 7691891

**URL:** https://aio.lv/en/product--viessmann-7691891--12084704
**Data updated:** 2026-03-13 08:56 (EET)
**Category:** Water Filters
**Manufacturer:** VIESSMANN
**Manufacturer code:** 7691891
**EAN:** 5903624953019
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 655.49 €
**Prices and availability valid until:** 2026-07-13 23:59
**Price without VAT (21%):** 541.73 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--viessmann-7691891--12084704

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 07.07.2026 | free |
| Pickup points | 10.07.2026 | 1.99 EUR |
| Courier delivery to door | 10.07.2026 | 4.99 EUR |

## Summary description

VIESSMANN AquaStilla 12 is a domestic water softener designed to reduce hardness by removing calcium and magnesium ions. Supplied as model 7691891, it is intended for household plumbing to protect boilers, heaters and appliances from scale buildup. Typical use includes improving soap performance, prolonging appliance life and reducing maintenance in residential systems.

## Long description

VIESSMANN AquaStilla 12 is a domestic water softener designed to reduce water hardness by removing calcium and magnesium ions. The unit is intended for installation in household plumbing to protect boilers, hot-water heaters and household appliances from scale buildup. By lowering hardness levels, AquaStilla 12 helps improve the effectiveness of detergents and soaps, reduces limescale-related maintenance and contributes to more efficient heat transfer in water-heating systems.
Advantages
AquaStilla 12 provides continuous softening performance for residential systems and is engineered for compatibility with standard household plumbing. The device reduces scale formation on heat exchangers and inside pipes, which can extend the service life of boilers, water heaters and appliances. It supports better soap lathering and cleaner dish- and laundry results while reducing the frequency of descaling and repairs. Installation and routine servicing are straightforward when following manufacturer guidance.
Suitable for
 Single-family homes and small residential properties
 Protection of boilers, water heaters and heat exchangers
 Improving detergent performance in washing machines and dishwashers
 Reducing limescale in taps, showers and plumbing circuits
Key specifications
 Application: domestic water softening for household plumbing
 Function: removes calcium and magnesium ions to reduce hardness
 Intended effect: reduces scale formation and improves soap/detergent efficiency
 Compatibility: designed for connection to standard residential water supply lines
 Typical benefits: energy-efficiency improvement for water heaters and reduced maintenance needs
How to use
Install AquaStilla 12 in the cold-water main feed of the property according to the manufacturer's installation instructions and local plumbing regulations. Ensure correct connection orientation and secure fittings to prevent leaks. Set up any required backwash or regeneration cycles as specified in the installation manual, and use recommended water-softening media and salt where applicable. Periodically check the unit for proper operation, inspect seals and valves, and perform regeneration or media replacement at intervals advised by the manufacturer based on water hardness and household consumption.
Usage recommendations
For reliable long-term performance, test incoming water hardness before installation and adjust service intervals accordingly. Follow the manufacturer's maintenance schedule, use appropriate regeneration consumables, and ensure installation by a qualified plumber to maintain warranty conditions and safe operation.

## FAQ

### How much does the VIESSMANN AquaStilla 12 water softener cost, and is it available for purchase?

The price is 655.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 5 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 07.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment, Leasing for legal entities. All transactions are 100% secure and encrypted.

### Can VIESSMANN AquaStilla 12 water softener be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All VIESSMANN products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized VIESSMANN service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/12084704/67568759_large.webp