# Expansion vessel Meibes BASEFLEX 12/1.5, 6 bar for central heating systems

**URL:** https://aio.lv/en/product--meibes-25301--12084038
**Data updated:** 2026-03-13 08:55 (EET)
**Category:** Heating Radiators
**Manufacturer:** Meibes
**Manufacturer code:** 25301
**EAN:** 8712874253018
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 41.49 €
**Prices and availability valid until:** 2026-07-16 23:59
**Price without VAT (21%):** 34.29 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--meibes-25301--12084038

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 08.07.2026 | free |
| Pickup points | 13.07.2026 | 1.99 EUR |
| Courier delivery to door | 13.07.2026 | 4.99 EUR |

## Summary description

Meibes BASEFLEX 12/1.5 is an expansion vessel designed for central heating (c.o.) systems with a maximum operating pressure of 6 bar and nominal volume 12 liters. It compensates system volume changes, reduces pressure peaks, and protects boilers and piping. Suitable for residential and light-commercial heating installations requiring an autoclave-type diaphragm vessel.

## Long description

Meibes BASEFLEX 12/1.5 is an expansion vessel for central heating systems with a nominal volume of 12 liters and a maximum working pressure of 6 bar. The vessel features a diaphragm design that separates the system water from the pre-charged gas cushion, allowing it to absorb volume changes in sealed heating circuits. It is intended for domestic and light-commercial heating installations where an autoclave-type diaphragm vessel is required to stabilise pressure and protect boilers, pumps and piping against pressure-related stress.
Advantages
The Meibes BASEFLEX 12/1.5 provides reliable pressure compensation in closed heating systems without the need to introduce additional water into the circuit. Its diaphragm construction reduces the risk of corrosion by preventing direct contact between the gas charge and system water. Designed for up to 6 bar operation, the vessel reduces pressure peaks and minimises cycling of boilers and circulator pumps, contributing to longer component life and more consistent system performance.
Suitable for
Residential central heating systems
Light-commercial heating installations
Closed-loop radiator and underfloor heating circuits
Systems requiring autoclave-type diaphragm expansion vessels
Key specifications
Nominal volume: 12 litres
Pre-charge pressure: 1.5 bar (factory setting)
Maximum operating pressure: 6 bar
Diaphragm (membrane) type design
Application: closed central heating systems
How to use
Install the expansion vessel according to the heating system layout, typically on the return line close to the boiler or pump station and secured to avoid stress on piping. Confirm the pre-charge pressure matches system requirements and adjust with a suitable air valve and pressure gauge if necessary before filling the system. After installation, bleed trapped air from the circuit and verify system pressure under normal temperature conditions. Periodically check the vessel pre-charge and visual condition during routine boiler maintenance.
Usage recommendations
For correct function, verify the pre-charge pressure is appropriate for the static system pressure and adjust when the system is cold. Regularly inspect for leaks, diaphragm integrity and proper mounting. Follow local regulations and manufacturer guidance during installation and service.

## FAQ

### How much does the Meibes BASEFLEX 12/1.5 expansion vessel cost, and is it available for purchase?

The price is 41.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 102 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 08.07.2026 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 Meibes 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 Meibes 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/12084038/67568102_large.webp