Central Heating Leaks Explained


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Spotting and fixing a central heating leak

What if you suspect the heating system is leaking? Find out more. Central heating leaks can be very expensive to fix if you leave them unattended for a long time.

It can be multiple types of central leaks, such as boilers, heating system pipes, radiators, or hot water cylinders.


Radiator, boiler, and cylinder leaks are kind of obvious to see, but what about internal heating system leaks?


Here are 3 signs you have an internal leak.

  • Higher water bills
  • Watermarks on the wall, floor, or ceiling.
  • Boiler is losing pressure.
  • If you experience any of these, you are more likely to have an internal leak.

Where can I have an external leak?

That can be anywhere, as multiple leaks exist, not just heating system leaks.
External can be radiator valves leaking, minor leaks, or more significant leaks from the ceiling with an obvious sign.
You can also have a leaking plumbing appliance, such as a washing machine or fridge. When the water comes out from any of these appliances, a professional is needed asap.
Overall the most obvious sign is a water drop or water running from the wall, ceiling, or floor.

What do I do if I have a central heating leak?

Once you notice any of those mentioned above, you better call out a professional with professional tools. Here at NL Group, we have the right tools to see through the walls, causing no more damage than you currently have with a leak.
Contact us today at info.nlleakdetection@gmail.com.


Central Heating System

Water Heating

Common components of a central heating system using water circulation include:
A supply of fuel, electric power, or district heating supply lines

  • A boiler
  • Pump to circulate the water
  • Radiators


The basic parts of a water circulation-based central heating system are fuel, electric power, or district heating distribution lines; a boiler (or a heat exchanger for district heating) that warms water for the system; a pump to circulate the water. And radiators that release heat into rooms as the warmed water flows through them.

Closed-loop systems circulate the same water over and over, heating and reheating it. Sealed systems, as opposed to the normal water supply in a building, provide a kind of central heating by circulating water independently for heating.


 A heating system leak can cause significant water damage and lead to an insurance claim. If you suspect a leak in your heating pipes, look out for signs such as a pressure drop or water leaks on your concrete floor. Faulty valves can also cause leaks, so it’s essential to locate the source of the problem as quickly as possible. Tracer gas and the latest equipment can help accurately pinpoint the location of the leak, so repairs can be carried out with minimal disruption. Don’t ignore a heating system leak; contact a professional to prevent further water damage and ensure the problem is fixed promptly. Always check the system pressure. 

Other Heating Systems


Two kinds of leaks can occur in the heating system. 1. Internal and 2. External. Whatever your experience, it is time to call a professional leak detection specialist to avoid further damage to your property.
Losing pressure is a common sign of a leak, but it can also be a boiler fault. A gas engineer can help you with that.
It can, depending on the issue. If it is a leaking TRV, it can be replaced, for instance.
Radiators are susceptible to corrosion over time and cause pinhole leaks. Because it can flood the house soon, it is better to call a plumber. ( central heating pipework – dropping pressure)
central heating leaks

Areas We Cover

Water supplies can leak without evidence and visible surface damage, slowly breaking up foundations and eventually causing massive damage. You may only know about leaks once you receive a letter or phone call advising of a possible leak from your water supplier.
Leak detection service provided by MML Plumbing Ltd, trading as NL Leak detection. We cover only the North London area, which means we can attend quicker than other leak detection companies covering the whole of London or the UK. We specialize in hidden water leaks, leak location, locating leaks, heating systems, leaking baths, and detecting leaks.