Introduction
Spotting a leak from your boiler can be alarming, especially if you’re in Selborne (GU34) and the water starts pooling on the floor. Whether you’re in Selborne, nearby Bordon, Alton, Liphook, or Petersfield, a leaking boiler needs prompt attention. This guide explains the likely causes of leaks, safe steps to take immediately, and when to call in a professional to avoid more serious damage.
Common Causes of Boiler Leaks
Internal Component Failure
Over time, seals and valves inside your boiler can wear out. A failed pressure relief valve, expansion vessel, or heating element seal may allow water to escape. These components are subject to constant pressure and temperature changes, leading to cracks or leaks.
Corrosion and Wear
If your boiler is several years old, internal corrosion can eat away at metal parts. Rust weakens the heat exchanger and pipe joints, causing small leaks that can grow if left unchecked. Houses in GU35 and GU34 areas with hard water may see faster corrosion rates.
High Pressure Issues
When the system pressure rises above the recommended level (typically around 1–1.5 bar), the pressure relief valve may activate and discharge water. Fluctuating pressure often results from a faulty expansion vessel or an overfilled system after topping up the water.
Frozen Condensate Pipe
In winter, the condensate pipe can freeze, forcing water back into the boiler and causing leaks around the condensate trap. This is a common issue in older properties across Selborne and surrounding villages during cold snaps.
Immediate Steps to Take When Your Boiler Leaks
- Turn Off the Water Supply: Locate the mains water shut-off valve and turn it off to prevent further flooding.
- Isolate the Boiler: Close the isolation valves on the flow and return pipes to stop water entering the boiler.
- Switch Off the Boiler: Use the on/off switch or boiler control panel to power down the unit safely.
- Contain the Leak: Place a bucket or towels beneath the leak to collect escaping water and protect flooring.
- Check the Pressure Gauge: If the gauge shows unusually high or low pressure, note the reading and be ready to relay it to your engineer.
- Note the Leak Source: Identify whether the leak is coming from a pipe joint, valve, or the boiler body itself. This information will help speed up the repair.
- Contact a Professional: Call a qualified Gas Safe engineer rather than attempting complex repairs yourself. This ensures safety and compliance with regulations.
Preventing Future Leaks
Regular Boiler Servicing
Annual servicing by a qualified engineer helps catch corrosion, worn seals, and pressure issues before they cause leaks. Consider routine boiler servicing to keep your system in top condition, especially if you live in regions like GU35 or GU32.
Install a Magnetic Filter
A magnetic filter fitted to your central heating system captures iron oxide sludge that can lead to corrosion and blockages. This simple upgrade reduces wear on components and helps prevent leaks in old pipework.
Maintain Pressure Levels
Check your boiler’s pressure gauge monthly and top up the system water if it falls below recommended levels. Avoid over-pressurising by following the manufacturer’s instructions or consulting your Gas Safe engineer.
Quality Installation
If your boiler is old or faulty, a new boiler installation by a Gas Safe engineer ensures all connections are secure and components are fitted correctly. Poor installation is a common cause of early leaks.
Role of a Gas Safe Engineer
Only a registered Gas Safe engineer has the expertise to diagnose and repair boiler leaks safely. They carry specialised tools to test pressure relief valves, inspect heat exchangers, and replace faulty seals. Calling a Gas Safe engineer protects your warranty and ensures all work meets national safety standards.
Boiler Cover and Homeowner Peace of Mind
Unexpected boiler repairs can be costly. Comprehensive boiler cover provides protection against emergency call-outs, breakdowns, and repair bills. If you’re in Hindhead, Farnham, or Liss, a cover plan can give you peace of mind through winter.
Frequently Asked Questions
1. Can I continue using my boiler if it’s leaking?
No. Running a leaking boiler risks water damage, electrical faults, and system failures. Isolate and switch off the boiler, then seek professional assistance.
2. How much does it cost to fix a leaking boiler?
Costs vary depending on the cause and required parts. Simple seal replacements may cost under £150, while a new valve or heat exchanger repair can reach £300–£500. Boiler cover can help offset these expenses.
3. What if the leak is coming from radiators and not the boiler?
Radiator leaks often stem from corroded valves or pinholes. While different from boiler leaks, a Gas Safe engineer or heating specialist can service or replace radiators to stop the issue.
If you need help with your heating or boiler, our local engineers are here to help. Call us on (01420) 558993 or book online at embassygas.com/book.
Written by Embassy Gas — your local heating experts covering Selborne, Bordon, Alton, Liphook, Farnham and surrounding areas.