# Expansion Vessel (Diaphragm) Reflex Solar S 12 1.5/10 bar max 70°C

**URL:** https://aio.lv/en/product--reflex-8704000--12043095
**Data updated:** 2026-03-12 19:25 (EET)
**Category:** Home Appliance Accessories
**Manufacturer:** Reflex
**Manufacturer code:** 8704000
**EAN:** 4036705109874
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 67.49 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 55.78 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--reflex-8704000--12043095

## 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

Diaphragm expansion vessel Reflex Solar S 12 designed for solar and heating systems. Nominal volume 12 liters, precharge 1.5 bar, maximum operating pressure 10 bar and maximum fluid temperature 70°C. Provides pressure compensation, protects against overpressure and ensures stable hydraulic balance in closed solar circuits and small heating installations.

## Long description

Reflex Solar S 12 diaphragm expansion vessel is designed for closed solar and small heating systems to compensate for thermal expansion of heat transfer fluids. With a nominal volume of 12 liters and factory precharge at 1.5 bar, this expansion vessel supports stable hydraulic balance, reduces the risk of pressure spikes and protects system components against overpressure in circuits with maximum operating pressure up to 10 bar and maximum fluid temperature up to 70°C.
Advantages
The vessel uses a durable elastomer diaphragm separating the fluid chamber from the precharged gas chamber to maintain consistent pressure behavior over repeated thermal cycles. Its compact cylindrical design allows easy installation in tight spaces near collectors, pumps or manifolds. Factory precharge simplifies commissioning, and the product is manufactured to resist corrosion and provide reliable performance in solar thermal and small closed-loop heating applications.
Suitable for
Closed solar thermal circuits and domestic hot water systems
Small closed heating installations and buffer circuits
Systems requiring pressure compensation and overpressure protection up to 10 bar
Installations with fluid temperatures up to 70°C
Key specifications
Nominal volume: 12 liters
Precharge pressure: 1.5 bar (factory set)
Maximum operating pressure: 10 bar
Maximum fluid temperature: 70°C
Diaphragm-type (elastomer) separation of gas and fluid chambers
Compact cylindrical construction for wall or stand mounting
How to use
Mount the expansion vessel according to system layout and local regulations, observing recommended orientation and securing methods. Connect the vessel to the system at a point where it will reliably receive expanding fluid, such as near the pump or manifold. Verify the factory precharge before installation and adjust only when the system is depressurized and drained to the appropriate level. After connection, pressurize the system to working pressure and check for leaks, stable pressure readings and correct interaction with the pressure relief and safety devices.
Usage recommendations
Check the precharge periodically and adjust as needed when the system is cold; inspect the vessel for external damage or corrosion at routine maintenance intervals. Use compatible heat transfer fluids and observe the maximum temperature and pressure limits to ensure long service life. For systems with higher pressures, larger volumes or temperatures above 70°C, select an appropriately rated expansion vessel.

## FAQ

### How much does the Reflex Solar S 12 expansion vessel cost, and is it available for purchase?

The price is 67.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 18 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. 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 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/12043095/67529993_large.webp