# Expansion vessel Reflex S 25 L model 9702900, diaphragm tank, 25-liter capacity

**URL:** https://aio.lv/en/product--reflex-9702900--10882043
**Data updated:** 2026-03-11 11:57 (EET)
**Category:** Heating Radiators
**Manufacturer:** Reflex
**Manufacturer code:** 9702900
**EAN:** 4036705032257
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 102.99 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 85.12 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--reflex-9702900--10882043

## 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

Reflex S 25 L expansion vessel (model 9702900) is a diaphragm-type pressure tank with 25 liters nominal capacity, designed for use in heating and hot water systems to absorb pressure fluctuations. The membrane separates air and system fluid to maintain stable system pressure, reduce pump cycling and protect components. Suitable for domestic and light commercial installations.

## Long description

Reflex S 25 L model 9702900 is a diaphragm expansion vessel with a nominal capacity of 25 liters, designed for heating and hot water systems. The internal membrane separates the system fluid from the precharged air cushion, allowing the vessel to absorb pressure fluctuations and compensate for thermal expansion. The device is suitable for domestic and light commercial installations where stable system pressure and protection of circulation pumps and safety valves are required.
Advantages
The diaphragm design prevents contact between the system fluid and the air cushion, reducing the risk of corrosion and loss of precharge. The compact cylindrical body enables wall or floor mounting in plant rooms with limited space. By smoothing pressure peaks, the vessel reduces pump cycling and wear on system components, improving operational stability. The robust construction and compatibility with standard heating system connections ensure straightforward integration.
Suitable for
 Residential central heating systems
 Domestic hot water installations
 Small commercial or light industrial heating circuits
 Systems requiring pressure compensation and reduced pump cycling
Key specifications
 Nominal volume: 25 liters
 Diaphragm (membrane) type: separates air and system fluid
 Function: compensates thermal expansion and absorbs pressure fluctuations
 Typical mounting: wall or floor installation in plant rooms
 Suitable media: water-based heating and hot water systems
How to use
Install the expansion vessel in the heating circuit according to system design and local regulations, ensuring correct orientation and secure mounting. Connect the vessel to the system using appropriate fittings and check for leaks. Verify and set the precharge pressure on the air side to match the static system pressure before commissioning. During commissioning, monitor system pressure while filling and heating to confirm the vessel is compensating expansion correctly.
Usage recommendations
Regularly inspect the vessel and verify the air precharge pressure during routine maintenance intervals. Check for signs of membrane failure such as continuous loss of system pressure or frequent pump start/stop cycles. Replace the vessel if the membrane is damaged or if the unit no longer maintains the correct precharge pressure.

## FAQ

### How much does the Expansion vessel Reflex S 25 L 9702900 cost, and is it available for purchase?

The price is 102.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 4 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, Installment. All transactions are 100% secure and encrypted.

### Can Expansion vessel Reflex S 25 L 9702900 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/10882043/60315608_large.webp