# Expansion Vessel FERRO CWU8W for Domestic Hot Water (8 L) - Diaphragm Tank

**URL:** https://aio.lv/en/product--ferro-cwu8w--12106351
**Data updated:** 2026-03-20 09:56 (EET)
**Category:** Home Appliance Accessories
**Manufacturer:** FERRO
**Manufacturer code:** CWU8W
**EAN:** 5901095654770
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 50.49 €
**Prices and availability valid until:** 2026-07-13 23:59
**Price without VAT (21%):** 41.73 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ferro-cwu8w--12106351

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 03.07.2026 | free |
| Pickup points | 08.07.2026 | 1.99 EUR |
| Courier delivery to door | 08.07.2026 | 4.99 EUR |

## Summary description

FERRO CWU8W is an 8-litre diaphragm expansion vessel designed for domestic hot water (DHW) systems. The membrane-type tank accommodates pressure changes in closed hot water circuits to protect plumbing and appliances. Suitable for installation on boilers, water heaters and circulation systems where an 8 L expansion capacity is required to maintain stable pressure and reduce cycling.

## Long description

FERRO CWU8W is an 8-litre diaphragm expansion vessel designed for domestic hot water systems. The membrane-type tank absorbs volume changes and pressure fluctuations in closed hot water circuits, helping to maintain stable system pressure and reduce wear on valves, pumps and water heaters. The compact cylindrical body and threaded connection allow for straightforward installation on boilers, water heaters and pump circulation loops where an 8 L expansion capacity is required.
Advantages
The diaphragm design separates the water and air chambers, preventing air absorption into the circuit and ensuring consistent pressure buffering. The corrosion-resistant internal surface and durable elastomer membrane provide long service life under typical domestic hot water temperatures. Compact dimensions and standard threaded connection make the vessel compatible with common domestic installations while reducing equipment cycling and pressure-related stress.
Suitable for
Domestic hot water (DHW) systems with closed circuits
Connection to boilers, water heaters and hot water circulation pumps
Installations requiring an 8-litre expansion capacity to stabilise pressure
Retrofit or replacement in residential plumbing systems
Key specifications
Nominal capacity: 8 litres
Diaphragm (membrane) type separating air and water chambers
Designed for closed domestic hot water circuits
Standard threaded connection for easy mounting
Suitable for typical potable hot water temperatures used in residential systems
Compact cylindrical construction for space-efficient installation
How to use
Install the expansion vessel on the hot water circuit at a location recommended by the system manufacturer, typically near the boiler, water heater or circulation pump. Ensure the system is depressurised before making the threaded connection. Pre-charge the air side to the required pressure with a hand pump or compressor if necessary and verify that the vessel is correctly oriented and secured. After installation, fill and pressurise the system, then check for leaks and correct pressure compensation during heating cycles.
Usage recommendations
Verify compatibility with the system's working pressure and pre-charge the vessel to the recommended value for optimal performance. Periodically check the pre-charge pressure and inspect the membrane for signs of wear or loss of elasticity to maintain reliable pressure control in domestic hot water systems.

## FAQ

### How much does the FERRO CWU8W 8L Diaphragm Expansion Vessel cost, and is it available for purchase?

The price is 50.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 2 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 03.07.2026 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/12106351/67642898_large.webp