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Central Heating Inhibitor: What It Is And How To Use It

Your central heating system won’t stay brand new forever, but of course, you want it to work as efficiently as it can for as long as possible. To make sure you get the most of out your boiler and overall heating system, you should at least consider an inhibitor for central heating. Adding the inhibitor to central heating can save you money on boiler system maintenance in the long run and keep your entire system running like clockwork.

This guide will explain how an inhibitor is used and why it will always be a wise decision when caring for your central heating system.

What is central heating inhibitor?

Central heating inhibitor is made up of a number of chemicals in liquid form, which are really beneficial to your boiler system. Looking after your heating system has always been an important factor when owning a boiler. If you don’t look after it, it won’t last. It’s as simple as that. 

Over time, your system and pipes can become clogged or eroded with rust and other unwanted materials, which all build up creating a ‘sludge’ like substance. It can also get stuck in some of the main components of your system, preventing it from running efficiently, or at all. The inhibitor liquid breaks down rust and unwanted minerals, ensuring the smooth running of your heating system.

How to add inhibitor to central heating system. 

The way to add inhibitor to your system depends on the kind of system you currently have. With a combi heating system, the inhibitor will go directly into your radiators. If you have a conventional boiler and heating system, the inhibitor will go into the heating tank, usually stored in the loft space. Here’s how to fill a central heating system with inhibitor:

Adding inhibitor to a loft tank. 

When adding the inhibitor to the feed and expansion tank in your loft, you’ll need to firstly stop the flow of water into the system. In some instances, you’ll have a valve on your tank which will do this. However, if this is not the case, you’ll need to find your mains water valve and turn it off. 

When the tank is empty, you’ll be able to see the condition it is in. If it looks like it is covered in limescale or corroded around the sides, you may need to take measures to clean this tank before you move any further. The inhibitor is then poured into the empty tank. Note down the number of radiators your household has, as this will be a good starting point to determine how much inhibitor you’ll need to use. The flow of water can then be turned back on.

Central heating inhibitor for combi boiler.

If you have a combi boiler heating system, there are a couple of ways you can add the inhibitor to a radiator. With a towel radiator, you can simply remove the plug on the top and pour it in. With a normal radiator, you’ll have to inject it into the valve where you would bleed a radiator.

For either method, you’ll have to ensure your entire heating system is turned off and your radiators have fully cooled down. Choose the radiator that you’ll be injecting your inhibitor into and shut both of the radiator valves. When you’ve attached the inhibitor container to the radiator securely, then you can inject in the liquid. You should turn on your heating for around 15 minutes afterwards for the inhibitor to travel around your central heating system.

How often should central heating inhibitor be changed?

Central heating inhibitor will need to be changed once a year or so. It will break down over time, allowing the minerals and rust to build up once more. Keeping on top of your system’s inhibitor intake will ensure that it always runs smoothly and any potential problems you may run into are kept to a minimum. 

You should always top up the inhibitor every time your system is drained. This drainage will obviously drain out the inhibitor liquid, so it’s important that you keep on top of it.

It’s important to find the best central heating inhibitor of a high quality to keep your system running efficiently. As we mentioned earlier, you need enough inhibitor for the amount of radiators you have. To put things into perspective a little for how much central heating inhibitor to use, it’s useful to know that an average sized container of the liquid should cover around 10 radiators. 

You can also use a central heating inhibitor test kit to get an accurate analysis of the concentration in the water of your heating system. These tests are easy to use and involve collecting water from your system into a sample tube. For more information about inhibitor testing, use our live chat feature to speak with an engineer. 

The benefits of central heating inhibitor.

Using inhibitor is very beneficial to your entire heating system in a number of ways, some of which we’ve already covered. As well as adding inhibitor to heating systems already in use, it’s also a good idea to use it in a brand-new system to help extend the life of it from day one. 

  • Central heating cleaner and inhibitor will firstly do what it says on the tin. It will clean away the debris and corrosion throughout your system, prolonging its life. The liquid is kind to a heating system. 
  • In the long run, you’ll save money on new boiler parts that could be expensive. Without an inhibitor, your system could experience the breakdown of components or blockages. It could fail to work completely without it. 
  • The process is more efficient. Radiators will be hotter much quicker due to the lack of debris filling up the system. 

Central heating inhibitor will ensure your system keeps on working.

Adding inhibitor to central heating will always ensure your system runs smoothly. It’s relatively straightforward to put inhibitor through your system, but if you feel you need a little more guidance, you can chat to one of our engineers for free using our live chat feature.

By purchasing your boiler from BOXT, we add the inhibitor as standard during the installation, so there is no need to worry about the process of adding it to your new system. If you’re looking for a new boiler system, use our ‘Find A Boiler’ tool. It only takes two minutes and we’ll recommend the perfect boiler for your home.

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