# Expansion Vessel FERRO K5UNI18W — universal wall-mounted, 18 L capacity

**URL:** https://aio.lv/en/product--ferro-k5uni18w--11888051
**Data updated:** 2026-03-09 21:11 (EET)
**Category:** Home Appliance Accessories
**Manufacturer:** FERRO
**Manufacturer code:** K5UNI18W
**EAN:** 5903738253623
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 67.49 €
**Prices and availability valid until:** 2026-07-25 23:59
**Price without VAT (21%):** 55.78 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ferro-k5uni18w--11888051

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 15.07.2026 | free |
| Pickup points | 20.07.2026 | 1.89 EUR |
| Courier delivery to door | 20.07.2026 | 4.99 EUR |

## Summary description

FERRO K5UNI18W is a universal wall-mounted expansion vessel with an 18-litre capacity designed for closed heating and hot water systems. It compensates pressure changes caused by thermal expansion, protects piping and appliances, and helps maintain system stability. Suitable for domestic and light commercial installations where a compact, wall-mounted expansion vessel is required.

## Long description

FERRO K5UNI18W is a universal wall-mounted expansion vessel with an 18-litre capacity designed for closed heating and hot water systems. It compensates for pressure changes caused by thermal expansion, helping to stabilize system pressure and reduce stress on pipes, valves and appliances. The compact wall-mounted design makes it suitable for installations with limited floor space while providing the required hydraulic buffering for domestic and light commercial applications.
Advantages
The FERRO K5UNI18W offers reliable pressure compensation through a durable pre-charged bladder, reducing the risk of overpressure events and minimizing frequent activation of safety valves. Its wall-mounted format saves floor space and simplifies integration into boiler rooms, utility closets or plant rooms. The vessel is compatible with standard closed-loop heating and hot water systems and supports steady operation by smoothing pressure fluctuations during temperature changes.
Suitable for
 Domestic central heating systems
 Small commercial or light industrial heating installations
 Domestic hot water closed-loop systems
 Boiler rooms and utility cupboards with limited floor space
Key specifications
 Nominal capacity: 18 litres
 Mounting type: wall-mounted
 Application: closed heating and hot water systems
 Internal separation: pre-charged elastomeric bladder
 Primary function: thermal expansion compensation and pressure stabilization
 Suitable environments: domestic and light commercial installations
How to use
Install the expansion vessel on a suitable wall bracket at a location that allows easy access for inspection and maintenance. Connect the vessel to the system on the return side or a designated connection point following the system designer's instructions. Ensure the vessel pre-charge pressure is set according to the system static pressure before filling the system with water. After installation, perform a system pressure test and check for leaks and correct operation of valves and controllers.
Usage recommendations
Verify and adjust the air pre-charge to match the closed system's static pressure; typically this is done when the system is drained or at atmospheric pressure. Inspect the vessel periodically for signs of external damage or corrosion and check connections and mounting fixings. If the bladder shows signs of failure (continuous pressure loss or water in the valve), replace the vessel or bladder in accordance with maintenance guidelines. Follow local codes and manufacturer instructions for safe installation and servicing.

## FAQ

### How much does the FERRO K5UNI18W expansion vessel, 18 L cost, and is it available for purchase?

The price is 67.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 6 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 15.07.2026 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. All transactions are 100% secure and encrypted.

### 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 FERRO 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 FERRO 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/11888051/67309179_large.webp