If you have a boiler pressure problem, you’re looking for a quick solution and as cheap as possible, for most heating leaks, using Leak Seal is not the ‘quick fix’ our customers hope for…
It does not come much cheaper than a bottle of leak sealant at about £20… Fernox and Sentinel are very common brands, these come in a variety of applicators, from a bottle to pour into a header tank or magnet to applicators used in a radiator bleed valve and pressurized cans to inject at the fill point.
Think of leak seal like a plaster on a cut, it does not last and unlike us, your pipes do not heal themselves.
The idea is that this fluid will only cure in contact with air and that should be where the leak is. However these are for VERY 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.
Leak Seal is a false economy…
We talk to most boiler manufacturers and leak seal often invalidates your warranty or at best is considered a poor solution to a problem. Like that plaster on a cut, it will fall of 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!
Leak seal can also cause problems with trace gas leak detection. It reacts to the trace gas as ‘air’ and sets, often fixing the leak but only for a while. We often 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!