# Expansion Vessel Unimet DART.2.CO-5L — 5 L, Heating System, 6 bar

**URL:** https://aio.lv/en/product--unimet-dart2co-5l--12072106
**Data updated:** 2026-03-12 21:51 (EET)
**Category:** Home Appliance Accessories
**Manufacturer:** Unimet
**Manufacturer code:** DART.2.CO-5L
**EAN:** 5907547666339
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 37.99 €
**Prices and availability valid until:** 2026-07-27 23:59
**Price without VAT (21%):** 31.40 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--unimet-dart2co-5l--12072106

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 16.07.2026 | free |
| Pickup points | 21.07.2026 | 1.89 EUR |
| Courier delivery to door | 21.07.2026 | 4.99 EUR |

## Summary description

Unimet DART.2.CO-5L is a 5-litre expansion vessel designed for closed central heating systems with a maximum operating pressure of 6 bar. The product compensates thermal expansion of heating medium, reduces pressure fluctuations and protects system components. Suitable for domestic and small commercial boilers, it mounts inline with piping to stabilize pressure and prevent relief-valve cycling.

## Long description

Unimet DART.2.CO-5L is a 5-litre expansion vessel engineered for closed central heating systems with a maximum operating pressure of 6 bar. It compensates for thermal expansion of the heating medium to stabilise system pressure, reduce pressure fluctuations and protect boilers, pumps and piping from overpressure and frequent relief-valve cycling. The compact design allows inline installation with existing piping systems in domestic and small commercial boiler installations.
Advantages
The expansion vessel provides reliable pressure damping through a pre-charged gas chamber separated from the heating medium by an internal diaphragm, ensuring predictable expansion control and minimizing waterlogging. Its 5-litre capacity and 6 bar maximum rating make it suitable for small to medium closed systems, delivering steady performance without requiring large installation space. Built for compatibility with standard heating components, it helps extend component life and reduces maintenance interventions caused by pressure-related faults.
Suitable for
 Domestic central heating systems
 Small commercial boilers and hydronic installations
 Heating circuits requiring pressure stabilization and protection
 Retrofit installations where inline mounting is needed
Key specifications
 Nominal volume: 5 litres
 Maximum operating pressure: 6 bar
 Type: closed system expansion vessel with internal diaphragm
 Intended medium: water or water-glycol mixtures commonly used in heating systems
 Mounting: inline connection compatible with standard heating pipework
 Application: designed for domestic and small commercial heating circuits
How to use
Install the expansion vessel in the heating system piping according to the system layout, positioning it where it can relieve pressure fluctuations effectively — typically near the boiler or on the feed/return line. Ensure the vessel is pre-charged to the correct air pressure for the system’s static pressure before filling; adjust the pre-charge using a standard air valve and pressure gauge. After installation and pre-charge adjustment, fill the system and check for leaks, correct operating pressure and proper diaphragm response during heating cycles.
Usage recommendations
Verify the system’s required pre-charge pressure and confirm compatibility with water-glycol mixtures if antifreeze is used. Periodically inspect the vessel for external damage and check the gas pre-charge pressure during scheduled maintenance to ensure continued pressure control and to prevent waterlogging.

## FAQ

### How much does the Unimet DART.2.CO-5L expansion vessel 5 L 6 bar cost, and is it available for purchase?

The price is 37.99 € (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 16.07.2026 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 Unimet 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 Unimet 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/12072106/67556855_large.webp