If you’re constantly topping up your boiler pressure, water is escaping from your heating system somewhere. This isn’t normal for a sealed system and always points to an underlying issue.
A healthy system should maintain stable pressure for long periods. If you’re refilling regularly, the system is losing water — even if you can’t see where it’s going.
Our Central Heating Leak Detection service is designed to trace that loss accurately and confirm the exact cause before any repairs are carried out.
What This Usually Means
In most cases, it means water is escaping somewhere within the sealed heating system. This could be from pipework under floors, joints within walls, radiators, valves, or internal boiler components.
Because the system is sealed, even a small leak will gradually reduce pressure over time without leaving obvious visible signs.
Why This Happens
Pressure loss is usually caused by a hidden leak or a failing component. Over time, wear and tear, corrosion, or movement in pipework can allow water to escape slowly.
Some faults mimic leaks, but the pattern of repeated pressure loss after topping up is one of the strongest indicators that water is leaving the system.
For a deeper explanation, see how heating leaks work.
How to Tell If This Is the Problem
- Your boiler pressure drops again after topping up
- You need to refill the system regularly to keep it running
- The pressure loss happens gradually over time
- No visible leaks are present, but the issue keeps returning
What Most People Get Wrong
Topping up the pressure is often treated as the solution, but it only resets the symptom. The system continues to lose water in the background, which can lead to worsening damage if left unresolved.
How the Problem Is Actually Solved
The issue is only properly resolved by locating the exact point where water is escaping. This requires specialist detection methods to trace the leak without unnecessary removal of floors or walls.
Once identified, the repair can be targeted and verified, restoring stable pressure to the system.
What to Do Next
If you’re repeatedly topping up your boiler, the next step is accurate diagnosis. Our Central Heating Leak Detection service will confirm the cause and give you a clear, repair-led solution.