# Expansion vessel for domestic hot water Comap 18 L, 4 bar safety, 10 bar max, 3/4-inch connection, white

**URL:** https://aio.lv/en/product--comap-25292--12036908
**Data updated:** 2026-03-12 16:45 (EET)
**Category:** Home Appliance Accessories
**Manufacturer:** Comap
**Manufacturer code:** 25292
**EAN:** 8712874252929
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 83.49 €
**Prices and availability valid until:** 2026-07-21 23:59
**Price without VAT (21%):** 69.00 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--comap-25292--12036908

## 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

Comap expansion vessel for domestic hot water systems, 18 L capacity with 4 bar precharge (operating) and 10 bar maximum pressure. Designed for installation on hot water circuits to compensate thermal expansion and maintain system pressure. Features a 3/4" threaded connection and white finish. Suitable for residential and light-commercial DHW applications.

## Long description

Comap expansion vessel for domestic hot water, 18 L capacity, with a 4 bar precharge suitable for typical residential and light-commercial DHW systems. It is designed to absorb thermal expansion in closed hot water circuits, helping to stabilise pressure and reduce stress on pipes and valves. The unit features a 3/4-inch threaded connection and a neutral white finish for straightforward installation and discreet appearance in utility spaces.
Advantages
The expansion vessel provides reliable compensation for thermal expansion, reducing pressure fluctuations and lowering the risk of leaks or component wear. Its 18 L volume and 4 bar precharge are matched to common domestic hot water installations, while the 10 bar maximum pressure rating ensures safety margin for occasional pressure spikes. The 3/4-inch threaded connection allows compatibility with standard plumbing fittings and simplifies mounting. The white finish offers corrosion-resistant external coating suitable for visible or concealed installation.
Suitable for
 Residential domestic hot water systems
 Light-commercial DHW installations
 Hot water cylinders and storage tanks with closed circuits
 Systems requiring pressure compensation for thermal expansion
Key specifications
 Nominal volume: 18 litres
 Operating precharge pressure: 4 bar
 Maximum allowable pressure: 10 bar
 Connection type: 3/4-inch threaded
 Finish: white external coating
 Application: closed domestic hot water circuits
How to use
Install the expansion vessel on the hot water circuit at a location recommended by system design, typically near the water heater or storage tank and on the cold feed or return line to optimise pressure compensation. Ensure the vessel precharge matches the system static pressure and adjust if necessary using the valve on the vessel. Secure the 3/4-inch threaded connection with appropriate sealing material and tighten to manufacturer-recommended torque. After installation, gradually bring the system up to operating temperature and check for leaks and correct pressure behaviour during thermal cycling.
Usage recommendations
Verify system static pressure and adjust the vessel precharge to match before final commissioning. Perform periodic visual inspections for external damage and verify precharge pressure annually or as part of routine system maintenance. Replace the vessel if membrane integrity is compromised or if the unit shows persistent pressure instability despite correct precharge.

## FAQ

### How much does the Comap expansion vessel 18 L 4 bar cost, and is it available for purchase?

The price is 83.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 47 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, Installment. All transactions are 100% secure and encrypted.

### Can Comap expansion vessel 18 L 4 bar 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 Comap 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 Comap 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/12036908/67524217_large.webp