A Wates Pressure Vessel is a key component in any hot water system, helping to regulate pressure, absorb thermal expansion, and protect system components from stress. While Wates vessels are built for durability, regular maintenance is essential to keep them performing at their best for years to come.
This guide covers the key steps to maintain your Wates pressure vessel and extend its service life.

1. Check the Pre-Charge Pressure Regularly

• Why it matters: The pre-charge pressure determines how well the vessel can absorb pressure changes.
• How to do it:
  1. Turn off the hot water system and isolate the vessel.
  2. Drain water from the vessel.
  3. Use a tyre-style pressure gauge to measure air pressure.
  4. Adjust to 0.2–0.3 bar below the pump cut-in pressure.

2. Inspect for External Damage

• Look for dents, cracks, rust spots, or leaks on the vessel body.
• Check fittings and connections for signs of corrosion or wear.
• Make sure mounting brackets or supports are secure.

3. Test the Vessel for Waterlogging

• Tap the side of the vessel — a hollow sound at the top and a dull sound at the bottom is normal.
• If the vessel feels heavy and sounds dull all over, the bladder or diaphragm may have failed, causing waterlogging.

4. Clean and Protect Connections

• Periodically disconnect and clean threaded fittings to prevent mineral buildup.
• Apply a suitable anti-corrosion paste or sealant when reconnecting.

5. Monitor System Pressure

• Keep an eye on the system pressure gauge during operation.
• If you notice frequent safety valve discharges or pressure fluctuations, the vessel may need recharging or repair.

6. Schedule Annual Professional Servicing

• A professional technician can:
  • Inspect the bladder or diaphragm for wear
  • Check internal anti-corrosion coatings
  • Test the vessel’s integrity under pressure
  • Replace any worn components

7. Protect Against Environmental Factors

• Ensure the vessel is installed in a dry, shaded, and well-ventilated location.
• Avoid exposure to freezing conditions or direct high heat sources.

8. Replace When Necessary
Even with good maintenance, bladders and diaphragms have a lifespan. If your vessel shows signs of failure — such as constant waterlogging or inability to hold pressure — it’s time for a replacement to maintain system safety and efficiency.
A well-maintained Wates Pressure Vessel can deliver stable hot water pressure, protect your heating system, and save energy for many years. By following these maintenance steps and scheduling regular checks, you can ensure long-term performance and avoid costly breakdowns. For more info contact Wates Sharjah or call us at +971 4 2522966.