Description
The 15mm x 1/2″ 10 Bar Unvented T & P Relief Valve is a critical safety component designed to protect unvented hot water systems from excessive pressure and temperature.
Set to activate at 10 bar, this valve automatically releases excess pressure and heat, preventing damage to cylinders and connected components. It ensures safe and reliable system performance in both domestic and commercial applications.
Built for durability and consistent operation, this valve is suitable as a direct replacement for a wide range of unvented cylinders including Megaflo, Kingspan, Joule, and Everflo.
Why This Valve Matters
- Protects against dangerous pressure and temperature build-up
- Ensures safe operation of unvented cylinders
- Meets UK compliance standards (WRAS approved)
- Prevents costly damage and system failure
Frequently Asked Questions
1. What does a T & P relief valve do?
It releases excess temperature and pressure from your unvented hot water system to prevent overheating, damage, or unsafe conditions.
2. What does 10 bar mean?
10 bar is the pressure level at which the valve activates. Once this limit is reached, it opens to safely discharge pressure.
3. Is this valve suitable for all unvented cylinders?
It is compatible with many systems including Megaflo, Kingspan, Joule, and Everflo, but always check your system’s required pressure rating.
4. Can I replace a lower bar valve with a 10 bar valve?
Only if your system is designed for 10 bar. Using the wrong pressure rating can affect safety and performance.
5. What are the signs of a faulty valve?
Common signs include constant dripping, leaks, pressure discharge, or overheating issues.







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