Unvented cylinder fault water dripping into tundish diagnosed issue and repaired.

There are various safety valves and expansion vessels to be checked. If your hot water is extremely hot this also indicates a fault somewhere within the unvented cylinder set up

Checking your unvented cylinder is a separate task to getting your boiler serviced

The Importance of Unvented Cylinder Maintenance and Servicing

Unvented cylinders are a popular choice for homeowners looking for a high-pressure hot water system. They offer excellent efficiency, improved water flow, and a reliable supply of hot water. However, like any heating system, unvented cylinders require regular maintenance and servicing to ensure they operate safely and efficiently. In this guide, we’ll explore the benefits of maintaining your unvented cylinder and what a professional service includes.

Why Regular Maintenance Is Essential

1. Safety First – Unvented cylinders operate under high pressure, meaning a fault could lead to serious risks such as leaks or even explosions. Annual servicing ensures all safety components are working correctly.
2. Improved Efficiency – Over time, scale buildup and sediment can reduce efficiency. Regular maintenance ensures your system runs smoothly, keeping energy bills in check.
3. Prolonged Lifespan – A well-maintained cylinder lasts longer, reducing the need for costly replacements.
4. Consistent Hot Water Supply – Avoid unexpected breakdowns and ensure you always have a reliable flow of hot water.
5. Warranty Compliance – Many unvented cylinder manufacturers require annual servicing to keep the warranty valid.

The Importance of Using G3-Qualified Engineers

When servicing or repairing an unvented cylinder, it is crucial to hire a G3-qualified engineer. G3 certification ensures that the engineer has undergone specialist training and is legally qualified to work on unvented systems. Using an unqualified person can lead to dangerous faults, including excessive pressure build-up, leaks, or system failures. A G3-certified professional will ensure that all safety components are functioning correctly and that your system remains compliant with current regulations.

What’s Included in an Unvented Cylinder Service?

A professional service includes a thorough inspection and key maintenance tasks such as:

• Pressure Checks – Ensuring the expansion vessel and pressure relief valves are functioning properly.
• Safety Valve Testing – Checking that safety valves operate correctly to prevent overpressure issues.
• Temperature Control Inspection – Ensuring thermostats and temperature relief valves are working effectively.
• Visual Leak Inspection – Identifying any signs of leaks or corrosion that could lead to bigger issues.
• Cleaning and Descaling – Removing limescale buildup to maintain efficiency.
• Re-pressurising the Expansion Vessel – Keeping pressure levels optimal for safe operation.
• General System Checks – Inspecting pipework, insulation, and overall condition of your unvented cylinder.

How Often Should You Service Your Unvented Cylinder?

All manufacturers recommended that there unvented cylinders are serviced annually by a qualified engineer. Regular checks help detect small issues before they become major problems, ensuring your system remains safe and efficient.

Signs Your Unvented Cylinder Needs Servicing

• Fluctuating Water Temperature – Inconsistent hot water could indicate a thermostat or pressure issue.
• Unusual Noises – Banging or gurgling sounds might be due to trapped air or limescale buildup.
• Leaking Water – Any signs of water leaks should be assessed immediately.
• Slow Hot Water Flow – A drop in water pressure could be a blockage or pressure issue.

Book Your Service Today

If you’re in Telford or the surrounding areas, Property fix offers expert servicing and maintenance for your unvented cylinder. Our qualified engineers ensure your system is running safely & efficiently.