# Expansion Vessel for Domestic Hot Water Reflex DD 18 L (model 7308300)

**URL:** https://aio.lv/en/product--reflex-7308300--12096112
**Data updated:** 2026-03-14 12:32 (EET)
**Category:** Other goods
**Manufacturer:** Reflex
**Manufacturer code:** 7308300
**EAN:** 4036705001437
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 98.49 €
**Prices and availability valid until:** 2026-07-26 23:59
**Price without VAT (21%):** 81.40 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--reflex-7308300--12096112

## 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

Reflex DD 18 L expansion vessel designed for domestic hot water systems. This sealed hydraulic accumulator with 18-litre nominal volume helps absorb pressure fluctuations, protects piping and appliances, and maintains system stability. Suitable for installation in hot water circuits, domestic boiler systems and indirect water heaters where an 18 L expansion capacity is required.

## Long description

Reflex DD 18 L expansion vessel is a sealed hydraulic accumulator designed for domestic hot water systems. With an 18-litre nominal volume, this vessel reduces pressure fluctuations caused by thermal expansion, protects piping, valves and appliances, and contributes to stable operation of boilers and indirect water heaters. The compact cylindrical design and corrosion-resistant materials make it suitable for integration into circulating hot water circuits where consistent expansion capacity is required.
Advantages
The expansion vessel provides reliable absorption of excess pressure in closed hot water systems, limiting stress on joints and reducing the number of safety valve activations. It is factory-assembled and pre-pressurized to simplify installation and commissioning. Built for long-term operation, the vessel's durable membrane and welded construction ensure leak-tight performance and minimal maintenance needs. Its nominal 18-litre capacity offers a balance between compact size and sufficient expansion volume for many domestic installations.
Suitable for
Domestic hot water systems in single-family homes and apartments
Indirect water heaters and buffer tanks connected to a boiler
Closed-loop circulating hot water circuits requiring an 18 L expansion capacity
Key specifications
Nominal volume: 18 litres
Type: sealed expansion vessel with internal membrane
Application: domestic hot water (closed systems)
Construction: corrosion-resistant outer shell with welded seams
Pre-charge: factory pre-pressurized for immediate commissioning
Connection: standard threaded connection compatible with typical hot water fittings
How to use
Install the expansion vessel on the return side of the hot water circuit or at the recommended point in the system schematic, ensuring correct orientation and secure threaded connection. Verify and, if necessary, adjust the pre-charge pressure to match static system pressure before filling the circuit. After installation, fill and purge the system according to the boiler or heater manufacturer’s instructions, then check system pressure and the vessel’s pre-charge periodically to ensure continued correct operation.
Usage recommendations
For reliable performance, confirm compatibility with the system’s maximum working pressure and operating temperature range, and set the vessel pre-charge slightly below the system static pressure. Periodic visual inspections and pressure checks during annual maintenance will help detect membrane wear or pressure loss early. Follow all local plumbing codes and the appliance manufacturer's guidance when integrating the expansion vessel into domestic hot water installations.

## FAQ

### How much does the Expansion Vessel Reflex DD 18 L cost, and is it available for purchase?

The price is 98.49 € (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 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, Installment. All transactions are 100% secure and encrypted.

### Can Expansion Vessel Reflex DD 18 L 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 Reflex 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 Reflex 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/12096112/67629606_large.webp