Boiler Losing Pressure in Kent

A boiler losing pressure can be stressful, especially in cold weather when you rely on heating and hot water. At DAKS Plumbing, we’ve helped homeowners across Swanley, Dartford, Bexley, Orpington and throughout Kent find the cause and restore pressure safely. This guide explains common reasons, how to repressurise, and when to call in a professional.

Why Is My Boiler Losing Pressure?

1. Leaks in the System — The most frequent reason for a boiler losing pressure is a hidden leak. Check around radiators, valves, or under the boiler for damp patches. Our leak detection services in Kent quickly find and fix the issue before it worsens.
2. Bleeding Radiators — Bleeding trapped air improves heat efficiency but releases system pressure. After bleeding, you’ll usually need to top up the boiler to 1–1.5 bar.
3. Faulty Pressure Relief Valve — This safety component can wear out, slowly releasing water even when the system is fine.
4. Expansion Vessel Problems — A failing expansion vessel causes the pressure to drop after heating cycles.

How to Check Boiler Pressure

Look at your boiler’s pressure gauge. When cold, it should read between 1.0–1.5 bar. Below 1.0 bar means low pressure; above 2.5 bar suggests overpressure — switch off and call an engineer if that happens.

How to Repressurise a Boiler

1. Turn Off the Boiler — Let it cool before adjusting anything.
2. Locate the Filling Loop — A silver flexible hose with two black valves under the unit.
3. Open Valves Slowly — Watch the pressure gauge as water flows in.
4. Stop at 1.5 Bar — Close both valves once within range.
5. Restart and Check — Confirm steady pressure after heating begins.

If your boiler keeps losing pressure after topping up, there’s likely an internal leak or component failure.

When to Call a Professional

Persistent drops in pressure often point to deeper issues like leaks, worn valves, or an ageing boiler. Our Gas Safe team provides reliable heating repairs and plumbing services across Kent, including Swanley, Dartford, Wilmington, and West Kingsdown. Visit the Gas Safe Register to verify your engineer’s credentials.

Preventative Boiler Care

• Check the pressure monthly to catch issues early.
• Book annual servicing to maintain efficiency and warranty cover.
• Consider replacement if your boiler is over 12–15 years old or frequently losing pressure.

Other Services to Support Your Home

DAKS Plumbing offers complete home maintenance, including bathroom installations, drainage solutions, and homebuyer plumbing inspections. We keep every part of your system safe and efficient.

Need Help with a Boiler Losing Pressure?

If you’re tired of repressurising your boiler every week, it’s time for expert help. Our DAKS Plumbing team offers fast callouts, honest advice, and lasting solutions across Kent. Contact us today for diagnosis, repair, or replacement.