# Expansion vessel Reflex S 12 L (model 9702700) – membrane tank, 12 liters

**URL:** https://aio.lv/en/product--reflex-9702700--12066363
**Data updated:** 2026-03-12 21:45 (EET)
**Category:** Home Appliance Accessories
**Manufacturer:** Reflex
**Manufacturer code:** 9702700
**EAN:** 4036705032233
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 72.49 €
**Prices and availability valid until:** 2026-07-13 23:59
**Price without VAT (21%):** 59.91 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--reflex-9702700--12066363

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 06.07.2026 | free |
| Pickup points | 09.07.2026 | 1.99 EUR |
| Courier delivery to door | 09.07.2026 | 4.99 EUR |

## Summary description

Reflex S 12 L expansion vessel (model 9702700) is a membrane-type pressure vessel with 12 liters nominal volume for heating and hot water systems. It separates the system fluid from the gas charge with an internal diaphragm to accommodate thermal expansion, maintain pressure balance, and protect components. Suited for small domestic boiler circuits and closed-loop installations.

## Long description

The Reflex S 12 L expansion vessel is a membrane-type pressure tank with a 12-litre nominal volume designed for closed heating and hot water systems. The internal diaphragm separates the hydraulic medium from a precharged gas chamber to accommodate thermal expansion, stabilise system pressure and reduce stress on pumps, valves and piping. The compact steel shell and corrosion-resistant internal components make the vessel suitable for domestic boiler circuits and small closed-loop installations where reliable compensation of volume changes is required.
Advantages
The membrane design prevents direct contact between fluid and gas, reducing gas loss and prolonging diaphragm life while ensuring consistent pressure control. With a 12-litre capacity, the vessel provides measurable expansion compensation in small domestic systems without occupying excessive space. Built according to typical industry standards for expansion vessels, it offers straightforward integration, low maintenance requirements and reliable protection for system components against pressure fluctuations.
Suitable for
 Small domestic heating systems and single-boiler circuits
 Closed-loop hot water installations in apartments and small houses
 Domestic hot water buffer and circulation systems
 Systems requiring a compact membrane expansion vessel for pressure compensation
Key specifications
 Nominal volume: 12 litres
 Type: membrane (diaphragm) expansion vessel
 Application: closed heating and hot water systems
 Construction: steel shell with internal elastomer diaphragm
 Mounting: suitable for horizontal or vertical installation depending on system layout
 Connection: standard threaded hydraulic connection for system integration
How to use
Install the expansion vessel in the return or feed line of the heating circuit where it can access the system fluid and be isolated by appropriate valves. Precharge the gas side to the recommended pressure for the specific system, taking into account static height and desired operating pressure; check and adjust the precharge with a pressure gauge before filling the system. After installation, pressurise and vent the heating circuit according to the boiler and system manufacturer instructions, then verify that the vessel and system maintain correct operating pressure during heat-up and cool-down cycles.
Usage recommendations
Regularly check the gas precharge and overall vessel condition as part of routine system maintenance. Inspect for loss of precharge, diaphragm failure, or external corrosion, and replace the vessel if functional integrity is compromised. When selecting installation location and precharge pressure, follow the heating system design parameters and manufacturer guidance to ensure correct pressure compensation and system protection.

## FAQ

### How much does the Reflex expansion vessel S 12 L (9702700) cost, and is it available for purchase?

The price is 72.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 5 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 06.07.2026 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 Reflex expansion vessel S 12 L (9702700) 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/12066363/67551622_large.webp