# Expansion vessel for heating Reflex 12 l, diaphragm pressure tank for central heating systems

**URL:** https://aio.lv/en/product--reflex-4036705200571--11252577
**Data updated:** 2026-03-11 12:03 (EET)
**Category:** Heating Radiators
**Manufacturer:** Reflex
**Manufacturer code:** 4036705200571
**EAN:** 4036705200571
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 48.49 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 40.07 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--reflex-4036705200571--11252577

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 07.07.2026 | free |
| Pickup points | 10.07.2026 | 1.99 EUR |
| Courier delivery to door | 10.07.2026 | 4.99 EUR |

## Summary description

Expansion vessel Reflex 12 l is a diaphragm-type pressure tank designed for central heating systems to absorb thermal expansion of water and maintain system pressure. With 12-liter volume, it protects boilers, radiators and piping from overpressure, reduces pump cycling and stabilizes hydraulic balance. Suitable for residential and small commercial heating installations.

## Long description

Expansion vessel Reflex 12 l is a diaphragm-type pressure tank designed for central heating systems. With a 12‑litre working volume, the vessel absorbs thermal expansion of water, stabilizes system pressure and reduces stress on boilers, radiators and piping. Its compact cylindrical design and pre-charged air chamber maintain hydraulic balance and help reduce pump cycling in residential and small commercial installations.
Advantages
The diaphragm design separates the air cushion from the water, preventing air dissolution and maintaining consistent pressure control over time. The 12‑litre capacity is suitable for small to medium closed-loop heating circuits and helps protect components from overpressure. Installation is straightforward thanks to standard connection dimensions and an accessible air valve for easy pre‑charge and maintenance.
Suitable for
Residential central heating systems
Small commercial heating installations
Boiler protection against pressure spikes
Hydraulic stabilization of closed-loop heating circuits
Key specifications
Type: diaphragm (membrane) expansion vessel
Nominal volume: 12 litres
Function: absorb thermal expansion and maintain system pressure
Mounting: compact cylindrical body for wall or floor-adjacent installation
Air pre-charge: accessible valve for pressure adjustment and maintenance
Connection: standard heating system connection dimensions suitable for domestic plumbing
How to use
Install the expansion vessel in a dry, accessible location near the boiler or main manifold, following local regulations and the heating system designer's instructions. Ensure the vessel is oriented according to the manufacturer's guidelines and connect it to the heating circuit using appropriate fittings. Before commissioning, check and, if necessary, adjust the pre-charge air pressure to the value recommended for the specific system (typically slightly below the system's static pressure). After filling and purging the heating circuit, recheck the vessel pressure and system pressure to confirm correct operation.
Usage recommendations
Regularly inspect the air pre-charge pressure and the vessel for external damage or corrosion. Check the system pressure and bleed air from the circuit as part of routine maintenance. Replace the expansion vessel if the diaphragm shows signs of failure (frequent pressure loss, waterlogging of the tank) or if repair is not possible.

## FAQ

### How much does the Expansion vessel Reflex 12 l cost, and is it available for purchase?

The price is 48.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 38 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 07.07.2026 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/11252577/68517092_large.webp