Flamco Contraflex Expansion Vessel - 100L - 1.5Bar - 6Bar - 26103
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City Plumbing GBFlamco Contraflex Exp Ves 100/1 5 6Bar 26103
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Product Information
Full details
The Flamco Contraflex Expansion Vessel (100L, 1.5Bar, 6Bar) is an essential component for professional heating engineers and homeowners managing sealed heating installations or chilled water cooling systems. It effectively absorbs the expansion of water caused by temperature changes, maintaining stable system pressure and preventing damage to pipes or valves; however, users should ensure the initial charge pressure is correctly calibrated by a qualified technician during installation to match their specific system requirements.
All features
| Model Part Number | 26103 |
|---|---|
| Brand | Flamco |
Extended Product Information
FAQs
What is the maximum pressure for this vessel?
This model is rated for a maximum working pressure of 6Bar.
Is this suitable for a small apartment heating system?
While it functions correctly, 100L is usually for larger systems. Ensure your system volume requires this capacity.
Can I use this for domestic hot water?
No, this specific Contraflex model is intended for sealed heating and chilled water systems, not potable hot water.
How often should I check the vessel?
It is recommended to check the pre-charge pressure at least once every 12 months as part of your annual boiler service.
What happens if the vessel is too small for my system?
An undersized vessel will cause the system pressure to rise too quickly when heated, often leading to the pressure relief valve discharging water.
Troubleshooting
System pressure fluctuates significantly when heating is on
Check the vessel's pre-charge pressure; it may need to be topped up through the air valve.
Water found leaking from the air valve
The internal diaphragm has likely ruptured; the vessel must be replaced.
Boiler pressure relief valve keeps discharging
The vessel may be undersized for the system or have lost its internal air charge, leading to excessive system pressure.
Pros and Cons
Pros
- Ensures system safety by preventing over-pressurization
- Suitable for both heating and chilled water systems
- Manufactured to strict EN12828 safety standards
- Substantial 100L volume for demanding system requirements
Cons
- Requires professional installation to ensure system safety
- Large physical size requires significant clearance for installation
- Requires periodic checks of the pre-charge pressure
Setup, Compatibility & Care
Installation must be carried out by a competent person in accordance with local regulations and EN12828. Before installation, confirm the vessel is sized correctly for your total system water volume. The vessel is equipped with a connection point that should be integrated into the return pipework near the boiler. Regarding care, the pre-charge pressure should be verified annually using a standard pressure gauge on the air valve. If you notice the system pressure fluctuating wildly during operation, it may indicate a loss of air pressure or a failing diaphragm, requiring immediate inspection by a heating professional.