# Expansion Vessel Reflex NG 12 diaphragm heating system 6 bar / 120°C (white)

**URL:** https://aio.lv/en/product--reflex-7240107--12352290
**Data updated:** 2026-04-26 18:52 (EEST)
**Category:** Home Appliance Accessories
**Manufacturer:** Reflex
**Manufacturer code:** 7240107
**EAN:** 4036705086601
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

Reflex NG 12 is a diaphragm expansion vessel designed for closed central heating systems. Rated for 6 bar maximum pressure and up to 120°C, it compensates for thermal expansion of heating water, maintains system pressure and protects components from overpressure. Suitable for domestic and light commercial boilers and radiators in sealed systems.

## Long description

Reflex NG 12 diaphragm expansion vessel is designed for closed central heating systems to accommodate the thermal expansion of heating water. Rated for up to 6 bar of operating pressure and temperatures to 120°C, this compact white vessel helps stabilise system pressure and reduce stress on boilers, pumps and radiators. The diaphragm separates the water chamber from the pre-charged gas side, enabling reliable pressure compensation in domestic and light commercial sealed heating installations.
Advantages
The Reflex NG 12 provides precise pressure management through its internal diaphragm design, offering reliable separation between the water and gas sections to prevent waterlogging and loss of function. Its 6 bar pressure rating and 120°C temperature tolerance make it suitable for a wide range of central heating applications while the compact white enclosure supports discreet installation in plant rooms or near boilers. Construction focused on compatibility with sealed systems helps protect components from pressure spikes and reduces the need for frequent maintenance.
Suitable for
Domestic central heating systems with sealed circuits
Light commercial boiler installations and small plant rooms
Radiator circuits and closed-loop hydronic heating systems
Systems where space is limited and a compact expansion vessel is required
When it may not be suitable
The Reflex NG 12 is intended for closed (sealed) heating systems; it is not suitable for open expansion systems or applications that require higher pressure ratings than 6 bar. Systems operating continuously above 120°C or requiring larger expansion volumes than the NG 12 can provide will need a different vessel size or specification.
Key specifications
Type: Diaphragm expansion vessel for heating systems
Maximum operating pressure: 6 bar
Maximum operating temperature: 120°C
Application: Closed central heating and sealed hydronic systems
Colour/finish: White exterior
How to use
Install the expansion vessel according to the system design and local regulations, typically on the return line near the boiler or pump where it can effectively absorb volume changes. Ensure the pre-charge pressure of the gas side matches the static system pressure or manufacturer guidance before filling the system. After installation, bleed any trapped air from the system and check for leaks; monitor system pressure during initial heating cycles and adjust pre-charge or isolation valves as required.
What to consider before purchase
Confirm the vessel volume is appropriate for your system's water volume and expansion needs
Verify the system's maximum operating pressure does not exceed 6 bar
Ensure the vessel's temperature rating (up to 120°C) suits your application
Check mounting space and connection orientation to fit the installation location
Usage recommendations
For reliable performance, set the vessel pre-charge to match the cold static pressure of the heating system, perform periodic visual and pressure checks, and replace the vessel if the diaphragm shows signs of deterioration or the unit becomes waterlogged. Follow local codes and the boiler manufacturer's instructions during installation and service.

## FAQ

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. 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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