Need to Replace a Part?
If your Ferroli boiler is leaking, you may need to replace a faulty component. At Suner, you’ll find original spare parts for Ferroli boilers—available online and with fast delivery.
🛠 Find pumps, valves, heat exchangers, gaskets, and more.
👉 Visit our store and get your Ferroli boiler working again today.
Is Your Ferroli Boiler Leaking Water?
Leaks in a Ferroli boiler can be caused by several different issues. Some are minor and easy to fix, while others may require professional attention. In this guide, we’ll walk you through 10 possible reasons your boiler might be leaking and what you can do about each one.
1. Expansion Vessel Is Damaged or Deflated
The expansion vessel helps regulate pressure inside the boiler. If the internal membrane is punctured or the air charge is lost, water may leak from the pressure relief valve.
Solution: Recharge the vessel or replace it if the membrane is broken.
2. Leaking Heat Exchanger
If you see water dripping from inside the boiler casing, the heat exchanger might be cracked or corroded.
Solution: Replace the heat exchanger. This is a delicate and expensive part, so professional replacement is recommended.
3. Safety Valve Is Open or Defective
If the boiler pressure is too high, the safety valve may release water to protect the system.
Solution:
- Check the boiler pressure (should be around 1–1.5 bar).
- If the valve is faulty, replace it.
4. Leaking Pump or Worn Pump Gaskets
The circulation pump can leak if its gasket is worn or if the pump is damaged.
Solution: Replace the pump gasket or the pump itself if the leak persists.
5. Leaking Radiator Valves
Sometimes, the problem isn’t in the boiler itself, but in the radiators or their valves, especially if you’ve recently filled the system.
Solution: Tighten or replace the leaking radiator valves.
6. Faulty Filling Loop
A filling loop that doesn’t close properly can cause water to continuously enter the system, increasing pressure and causing leaks.
Solution: Replace the filling loop or its isolation valves.
7. Corroded Pipes or Fittings
Leaks from pipe joints or corroded fittings near the boiler are common in older systems.
Solution: Inspect all visible pipework and replace any corroded sections or fittings.
8. Pressure Relief Valve Constantly Releasing Water
If the pressure relief valve drips constantly, it may be stuck open due to scale or debris.
Solution: Clean or replace the valve.
9. Blocked Condensate Pipe
If the condensate pipe is blocked, water can back up and overflow from the boiler.
Solution: Clear the blockage—usually with warm water if it’s frozen or with a pipe cleaner if it’s clogged.
10. Internal Leaks from Seals or Gaskets
Boilers have many internal seals and gaskets that can wear out over time, causing small leaks inside the casing.
Solution: Locate the damaged seal and replace it. In many cases, this will require removing the boiler casing.
Frequently Asked Questions – Ferroli Boiler Leaking Water
🔧 Can I keep using the boiler if it’s leaking?
No. Continuing to use a leaking boiler can be dangerous and cause more damage. Turn it off and investigate the issue.
🧪 What pressure should my boiler be at?
Around 1 to 1.5 bar when cold. If it’s higher than 2.5–3 bar, it could trigger the safety valve and cause leaking.
🔁 Why does the pressure keep rising?
Likely due to a faulty expansion vessel or a filling loop that is stuck open.
🧼 Can I fix the leak myself?
If it’s a minor issue like a radiator valve or a filling loop, yes. But for internal components or the heat exchanger, you should contact a technician.
Conclusion
A leaking Ferroli boiler can be caused by several different things: from a loose valve to a damaged internal part. Some problems can be fixed with basic tools, while others need a specialist.
Always check the pressure, expansion vessel, valves, and pipes—and remember, you can find all original replacement parts for Ferroli at Suner’s online store.