Do You Need to Get Your Unvented Cylinder Serviced?

If you rely on an unvented cylinder for your home's heating and hot water, you're already familiar with its efficiency and reliability. However, like any piece of equipment, it needs proper care to keep running smoothly. One of the most important steps in caring for your unvented cylinder is annual servicing—but why is it necessary, and what does it involve?

This post will guide you through everything you need to know about servicing your unvented cylinder, from recognising the signs it might need attention to understanding what’s included in a professional service. By the end, you’ll know exactly how to keep your cylinder in top condition and why regular maintenance is a must.

What Are Unvented Cylinders?

Before we get into servicing, let's explain what an unvented cylinder is. Unlike traditional vented cylinders, which rely on a cold water tank in your loft, unvented cylinders connect directly to your mains water supply. This setup provides:

• Higher water pressure for powerful showers and taps.

• Space-saving benefits, since no loft tank is required.

• Consistent water temperature throughout your home.

Unvented cylinders are a key component in modern heating and hot water systems. However, their increased pressure and advanced mechanics mean regular servicing is essential to prevent issues and maintain performance.

Signs Your Unvented Cylinder Needs Servicing

While yearly servicing is highly recommended, there are some warning signs that could indicate your cylinder needs immediate attention. Keep an eye out for:

• Inconsistent Water Temperature

If your water fluctuates between hot and cold, there could be an issue with the thermostat or heating elements within the cylinder.

• Unusual Noises

Hissing, banging, or clunking sounds may point to trapped air or limescale buildup within the system.

• Leaks or Dripping

Any leak, no matter how minor, should be inspected by a professional immediately. Left unchecked, leaks can cause significant damage to both your cylinder and your home.

• Reduced Water Pressure

A noticeable drop in water pressure might signal blockages or wear and tear on internal components.

If you experience any of the above, don’t wait. Contact a certified professional to carry out an inspection and fix any issues before they escalate.

The Importance of Regular Servicing

Annual servicing is more than just a recommendation—it’s a necessity for the long-term care and safety of your unvented cylinder. Here’s why:

Safety First

Unvented cylinders operate under high pressure, so professional checks are needed to ensure all safety mechanisms—such as pressure release valves—are functioning correctly. Faulty components could result in potentially dangerous pressure build-ups.

Warranty Protection

Most unvented cylinders come with a manufacturer’s warranty. However, failing to service your unit annually could invalidate your warranty. A routine service proves the cylinder is being properly maintained and ensures your warranty remains intact.

Improved Efficiency

Over time, wear and tear can lead to reduced efficiency in your hot water system. Regular servicing helps optimise your cylinder’s performance, keeping your energy bills under control.

Extended Lifespan

Annual maintenance prevents costly breakdowns and extends the life of your unvented cylinder, saving you money in the long run.

DIY Checks and Maintenance Tips

While professional servicing is critical, there are a few things you can do yourself to keep your unvented cylinder in great shape:

• Check for Visible Leaks

Regularly inspect around the base of the cylinder and nearby pipework for any signs of water.

• Monitor Water Pressure

Be mindful of water pressure at your taps and showers. Sudden changes may indicate a problem with the system.

• Keep Vents Clear

Ensure the area around the cylinder is free of dust and debris to allow proper ventilation.

• Check the Expansion Vessel

Look for visible damage or a loss of pressure. Adjustments and repairs should always be left to a professional.

While these tips can help you spot potential issues early, they are no substitute for an annual professional service.

What Happens During a Professional Service?

A properly qualified engineer will follow a comprehensive checklist when servicing an unvented cylinder. This typically includes:

1. Safety Component Checks

Ensuring that safety valves, like the temperature and pressure release valve, are operating correctly.

2. System Inspection

The engineer will inspect the cylinder, pipework, and controls for signs of wear, damage, or limescale buildup.

3. Cleaning and Flushing

Removing limescale and debris to ensure optimal performance and efficiency.

4. Pressure Testing

Checking system pressure to confirm it's within safe operating limits.

5. Replacement of Worn Parts

Any failing parts, such as seals or gaskets, will be replaced to prevent future issues.

A thorough professional service can catch minor problems before they become costly repairs.

How Much Does Servicing Cost?

Annual servicing for an unvented cylinder typically costs anywhere from £80 to £200, depending on factors such as:

• Your geographic location.

• The complexity of your system.

• Whether any replacement parts are required.

Remember, this cost is a small investment compared to potential repair costs from neglecting maintenance.

Don't Neglect Your Cylinder's Health

Your unvented cylinder is the powerhouse behind your home’s hot water supply. Regular servicing ensures it stays safe, efficient, and longer-lasting. If it’s been more than a year since your last professional service or you’ve noticed any warning signs, it’s time to take action.

Other related guides

Can an Unvented Cylinder Be Installed in a Loft Space?
How to Choose the Right Unvented Cylinder for Your Home
Why Is My Unvented Cylinder Losing Pressure?