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header-product Flamco Contra Flex Expansion Vessel 18L Red Wall-Mounted for Heating Systems 3 bar
48.99 €

Flamco Contra Flex Expansion Vessel 18L Red Wall-Mounted for Heating Systems 3 bar

Flamco Contra Flex 18L Expansion Vessel Photo 1

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Flamco Contra Flex Expansion Vessel 18L Red Wall-Mounted for Heating Systems 3 bar

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Flamco Contra Flex Expansion Vessel 18L Red Wall-Mounted for Heating Systems 3 bar

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Short description

Flamco Contra Flex wall-mounted expansion vessel with an 18-litre capacity designed for closed central heating systems. Features a durable red finish and a maximum operating pressure of 3 bar, ensuring efficient pressure regulation and reliable performance in domestic and commercial heating installations.
Available for order: 23 pcs.
Warranty: 2 Years
SKU: 12746250
Manufacturer: FLAMCO
free shipment

Cheapest delivery:

Unisend LV

Pick-up points

Unisend LV

Cost

1.99 €

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Customer service center
2b. Kengaraga str., Riga, Latvia, LV-1063
16.11.2026 {{selectedOffer.officeDeliveryString}}
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20.11.2026 {{selectedOffer.courierDeliveryString}}
From 4.99 €
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Product information

Description

The Flamco Contra Flex Expansion Vessel 18L Red Wall-Mounted for Heating Systems 3 bar is a reliable and efficient component designed to absorb water volume fluctuations in closed central heating installations. Manufactured by Flamco, this wall-mounted expansion vessel helps maintain optimal system pressure and prevents pressure drops or spikes that can affect heating performance. Featuring a durable red finish, it is engineered for both domestic and commercial heating systems to ensure safe and stable operation.

Advantages

This Flamco expansion vessel provides dependable pressure regulation, helping to extend the lifespan of your heating system components by protecting them from excessive pressure. Its compact wall-mounted design allows for straightforward installation in confined spaces without sacrificing performance. The robust construction ensures long-term durability and reliable functioning under normal operating conditions in closed central heating systems.

Suitable for

  • Closed central heating installations in residential homes
  • Commercial heating systems requiring pressure regulation
  • Wall-mounted setups where space efficiency is important
  • Systems operating up to a maximum pressure of 3 bar

When it may not be suitable

This expansion vessel is not suitable for open-vented heating systems or domestic hot water potable water supply systems. It is specifically designed for closed central heating circuits and should not be used outside its rated capacity and pressure limits.

Key specifications

  • Capacity: 18 litres
  • Maximum operating pressure: 3 bar
  • Mounting type: Wall-mounted
  • Colour: Red
  • Application: Closed central heating systems

How to use

Installation should be performed by a qualified heating technician in accordance with local regulations and manufacturer guidelines. The vessel must be securely mounted to the wall using appropriate fixings and connected to the return or flow line of the closed central heating system. Ensure that system pressure is correctly set during installation and periodically checked as part of routine maintenance.

What to consider before purchase

  • Verify that the 18-litre capacity matches the total water volume and thermal expansion requirements of your heating system.
  • Confirm that the maximum operating pressure of 3 bar is compatible with your heating equipment.
  • Check available wall space and clearance for proper plumbing connections.
  • Ensure compatibility with closed central heating systems only.
Usage recommendations: Regularly inspect the expansion vessel and system pressure annually to ensure proper functionality and prevent unexpected heating system inefficiencies.

Description

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Product comparison

The Flamco Contra Flex Expansion Vessel 18L Red Wall-Mounted for Heating Systems 3 bar is compared against several alternatives from the same brand (capacities of 8 liters, 12 liters, 25 liters, and 35 liters) and the Comap Solarix 25/2.5 model. All of these products are designed for closed heating and thermal circuits to absorb volumetric water expansion, but they differ significantly in total capacity, mounting orientation, and maximum pressure limits.

⚙️ The table below compares the core characteristics of these expansion vessels and explains the practical significance of their differences for system design.

ParameterFlamco Contra Flex 18LFlamco Contra Flex 25LFlamco Contra Flex 8LFlamco Contra-Flex 12 LComap Solarix 25/2.5Flamco Contra Flex 35LPractical conclusion
System typeHeating systemsHeating systemsHeating systemsHeating and cooling systemsSolar and heating systemsHeating systemsFlamco vessels are tailored for heating and cooling networks, while Comap supports solar thermal circuits as well.
Vessel capacity18 liters25 liters8 liters12 liters25 liters35 litersCapacity must match the total water volume of the installation; 18 liters suits medium residential systems, while smaller or larger variants fit different building sizes.
Maximum pressure3 bar3 bar3 bar3 bar10 bar3 barStandard heating runs fine on 3 bar, but Comap supports up to 10 bar for higher-pressure or specialized applications.
Mounting typeWall-mountedWall-mountedHangingWall-mountedSpecialized setupStanding (floor)Wall-mounted units save mechanical room space, whereas the 35-liter standing model requires floor footprint.

◎ The table below evaluates which product version is most suitable for different installation requirements and use cases.

Use caseRecommended productWhy
Standard residential heating systemFlamco Contra Flex 18LProvides an ideal 18-litre capacity balance for typical household heating circuits with moderate water volume.
Compact spaces and smaller circuitsFlamco Contra Flex 8L or 12 LSmaller capacities are well-suited for restricted spaces or lower-volume heating/cooling setups.
Large buildings or extensive heating networksFlamco Contra Flex 25L or 35LHigher capacities (25 and 35 liters) absorb greater thermal expansion in extensive pipe networks.
Solar thermal systems and high-pressure circuitsComap Solarix 25/2.5Engineered to handle solar circuits and withstand operating pressures up to 10 bar.

The Flamco Contra Flex Expansion Vessel 18L Red Wall-Mounted for Heating Systems 3 bar differs from the alternatives by offering an 18-litre capacity tailored specifically for medium-scale heating configurations. It is most suitable for homeowners and installers looking for a reliable, wall-mounted vessel for standard heating loads without paying for excess capacity or specialized high-pressure solar ratings.

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Customer reviews

Customer questions

FAQ

How much does the Flamco Contra Flex 18L Expansion Vessel cost, and is it available for purchase?

The price is 48.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 23 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 16.11.2026 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 FLAMCO 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 FLAMCO 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. We will assist with consultation, warranty claim processing, and coordination with certified service centers.
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