Why Service my Unvented Cylinder

An unvented cylinder needs regular servicing to ensure it operates safely and efficiently. Here are the key reasons why servicing is essential:

1. Safety Checks
• Unvented cylinders are pressurized and store hot water. If safety components fail, there is a risk of overheating, explosion, or scalding.
• The expansion vessel, pressure relief valves, and thermostats need checking to prevent dangerous pressure build-up.

2. Preventing Leaks & Corrosion
• Over time, seals, joints, and fittings can degrade, leading to leaks that reduce efficiency and can cause water damage.
• Limescale buildup inside the cylinder can also lead to corrosion, affecting performance and lifespan.

3. Efficiency & Performance
• A poorly maintained cylinder can result in reduced water pressure, longer heating times, and higher energy bills.
• Servicing ensures it is heating water efficiently and maintains proper water flow.

4. Legal & Warranty Requirements
• Many manufacturers require annual servicing to validate warranties.
• Landlords must service unvented cylinders annually to comply with legal safety regulations.

5. Legionella Prevention
• If water temperatures are not properly maintained, bacteria like Legionella (which causes Legionnaires' disease) can develop in the system.

How Often Should It Be Serviced?
• It is recommended to service an unvented cylinder once a year by a qualified engineer (G3 certified in the UK).

Regular servicing ensures your unvented cylinder remains safe, efficient, and legally compliant while avoiding costly breakdowns