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No Hot Water? Check Your Boiler Pressure!

Ever come home from a long day, dreaming of a hot shower, only to find… no hot water? One culprit could be a loss of pressure in your boiler. But don’t panic! In this blog, we’ll help you diagnose the problem and, in some cases, even fix it yourself.

Understanding Boiler Pressure:

Your boiler heats water and circulates it through your home’s pipes and radiators. To function properly, it needs proper pressure to “push” the water. Modern combi boilers use a filling loop connected to the cold water supply to maintain this pressure.

Normal Pressure and Checking:

Normal boiler pressure typically falls between 1.0 and 1.5 bars. You can check the pressure gauge on your boiler, usually located on the front. The gauge will often have colored sections (green and red) indicating the appropriate pressure range.

Causes of Pressure Loss:

Several factors can cause your boiler to lose pressure:

  1. Boiler Leak: Leaks can occur from various points, including valves, joints, or the heat exchanger. If you notice a puddle under your boiler, call a registered gas engineer immediately.
  2. Leak in the System: Leaks can also occur in the piping throughout your house. Inspect the pipes, especially around joints and bends, for signs of leakage. If you suspect a leak, call a certified professional to fix it.
  3. Faulty Pressure Relief Valve: This valve releases excess pressure to prevent boiler damage. A faulty valve can leak at lower pressures. In this case, call a professional to replace the valve.
  4. Damaged Expansion Vessel: This vessel absorbs pressure changes in the system. When damaged, it can’t expand, causing pressure spikes and triggering the relief valve. Regular boiler servicing can help prevent this. If your vessel needs repair, a licensed professional can handle it.
  5. Recently Bled Radiators: Bleeding air out of radiators can slightly lower pressure. To fix this, simply re-pressurize your boiler using the filling loop (refer to your boiler manual for specific instructions).
  6. Broken Boiler Parts: If your boiler monitor displays an error code or unusual behavior, it likely has a broken part requiring professional replacement. Depending on the boiler’s age and the cost of repairs, a new boiler replacement might be a better option.

What to Do:

  • If you can’t locate a leak or suspect a broken part, try re-pressurizing the boilerfollowing the manufacturer’s instructions.
  • For any other issues, always consult a qualified professional to diagnose and fix the problem. Attempting DIY repairs can be dangerous.
  • Consider a new boiler if yours is old and experiencing frequent problems.

Remember: By understanding boiler pressure and its potential issues, you can keep your home warm and comfortable. And if you do encounter problems, don’t hesitate to seek professional help!

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