UK Leak Detection - Why you should not use leak seal!


A preface to this article must mention that UK Leak Detection try to avoid bookings where leak detection is unlikely to be successful. We do ask about the period of time taken to lose pressure and if applicable will offer other advice when we feel it is not the time to try and locate yet.

When you have a boiler pressure problem and are losing your heating or hot water, it is understandable that you look for a quick solution and as cheap as possible, why wouldn’t you!

For most heating leaks, unfortunately using Leak Seal is no longer the ‘quick fix’ our customers hoped for…

It does not come much cheaper than a bottle of leak sealant for around £20; Fernox and Sentinel are prevalent brands of leak seal. These come in a variety of applicators, from a bottle to pour into a header tank, radiator or magnetic boiler filter. Other applications use a radiator valve or filler loop. Pressurized cans inject at these points and can be the simple to use.

However, think of leak seal like a plaster on a cut, it does not last, and unlike us, your pipes will not heal themselves. When this ‘plaster’ falls off the leak is still there.

The idea behind the leak sealant is that this is a liquid glue, that only sets in contact with air; that should be where the leak is.

However this is for minor leaks, the sort that you top up every few weeks and not within a couple of day or even hours, add the cost of a plumbers call-out, and leak seal is about £100 and often either only slow the leak, or the leak seal fails after a short time.

Unless the leak is tiny, Leak Seal is a false economy…

UK Leak Detection - Why you should not use leak seal!

UK Leak Detection talk to most boiler manufacturers and many states that leak seal will invalidate your boiler’s warranty or at best is considered a poor solution to a problem.

Like that plaster on a cut, it will fall off at some point. Having set it is now a solid that can block your boiler causing a big bill for a new heat exchanger….and you still have the leak to find!

Think of that plaster on a cut, not falling off but going into the bloodstream. It will cause a blocked artery or worse a heart attack if you think of the boiler as the heart of the heating system.

Leak seal sometimes causes problems with trace gas leak detection. Leak seal needs to set in air and reacts to the trace gas as ‘air’ and sets, often fixing the leak but only for a while.

We find a system that has been treated with leak seal has no rhyme or reason to pressure loss. Some days pressure is all gone, and other weeks, boiler pressure lasts days or more, chasing a moving target is a real headache and one to be avoided!

It is best to locate a leak and deal with it permanently. This will initially cost more but is often absorbed as part of an insurance claim, making it far more cost-effective than the temporary solution of leak seal.

Unfortunately, we tend to be involved after someone has already added it to the system, often well-meaning and hoping to solve the problem; hopefully, you are reading this before it is added!

Call UK Leak Detection now

 0800 228 9000