# Expansion vessel Reflex membrane tank N 400 L for central heating, model 8218000

**URL:** https://aio.lv/en/product--reflex-8218000--12053280
**Data updated:** 2026-03-12 19:36 (EET)
**Category:** Heating Radiators
**Manufacturer:** Reflex
**Manufacturer code:** 8218000
**EAN:** 4036705110139
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

Reflex membrane expansion vessel N 400 L (model 8218000) is a 400‑litre pressure vessel designed for central heating systems. The tank separates the heating circuit from the expansion medium via an internal membrane to absorb volume changes and maintain system pressure. Suitable for use in residential or light commercial boiler installations to prevent overpressure and reduce cycling.

## Long description

Reflex membrane tank N 400 L (model 8218000) is a 400‑litre expansion vessel designed for central heating systems. The tank features an internal membrane that separates the heating circuit from the expansion medium, allowing it to absorb thermal volume changes and stabilise system pressure. Its capacity and membrane design make it suitable for residential and light commercial boiler installations where reliable pressure management and reduced pump cycling are required.
Advantages
The Reflex N 400 L expansion vessel provides stable pressure control and reduces the risk of overpressure in the heating circuit. The internal membrane prevents mixing of heating water and the expansion medium, which helps maintain water quality and system longevity. The large 400 L capacity minimises cycling of pumps and boilers under varying load conditions, while robust construction supports safe operation in typical central heating environments.
Suitable for
Residential central heating systems with significant water volume
Light commercial boiler plants and small apartment blocks
Systems requiring reduced pump and boiler cycling
Installations where separation of expansion medium and heating water is necessary
Key specifications
Nominal volume: 400 litres
Membrane-type expansion vessel with internal separating diaphragm
Application: central heating systems
Function: absorbs thermal expansion and stabilises system pressure
Suitable for residential and light commercial installations
How to use
Install the Reflex membrane tank in accordance with national and local plumbing and heating regulations, ensuring correct orientation and secure mounting. Connect the vessel to the heating system at the designated expansion connection point using compatible fittings and ensure the pre-charge pressure of the expansion side is set to match the static system pressure. After installation, bleed the system of air and verify system pressure and membrane integrity during initial commissioning and periodic maintenance.
Usage recommendations
Check and adjust the pre-charge pressure before commissioning and during scheduled maintenance. Inspect the membrane and vessel connections periodically for leaks or signs of wear, and follow manufacturer guidelines for safe installation and pressure settings to ensure optimal performance and system protection.

## FAQ

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Leasing for legal entities. 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

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