Where is filling loop on combi boiler

When installing external filling loops it is important to check what valves the loop has and ensure you are installing it the right way round, to avoid any water flowing the wrong way. Some boilers, namely combi boilers, actually have the filling loop integrated into the system. Mechanically, these function in the same way as external filling loops, but they can be found beneath the boiler in the form of a coloured lever.

There may be problems with internal valves which are difficult to fix individually and it is much quicker to try a new filling loop first. If this fails, then you may need to replace something internally in your boiler and this could be a more complex job. Combi boilers tend to have flexible filling loops. These look like short, braided pieces of stainless steel and they go into two taps that are beneath your boiler and connected to copper pipes.

In the event that you need to replace a filling loop that is built onto the side or beneath your boiler, you must follow three simple steps. If the pressure gets too low in your boiler it is easy to re-pressurise the system and is something we recommend homeowners knowing anyway. We are using the Baxi Boiler as an example as it has 3 main ways of re-pressurising depending on your model.

Instructions do vary depending on the type of boiler you have and also the type of filling loop it is fitted with. Sometimes they do not have a filling loop at all. Follow our step by step instructions below for both rigid and flexible filling loops and for boilers without filling loops at all:.

Beneath the boiler, you should be able to locate a green lever. Pull the lever until the pressure gauge shows As a final check, look round your radiators to ensure they are not leaking any water. If while you are re-pressurising your boiler, you exceed 2. Did the job as intended without a problem Date published: Are filling loops universal?

I have a vaillant ecoTEC pro combination boiler and need a filling loop to put my water pressure up. My boiler is 12 years old so not the newer fancy ones. Would any combi loop do? Hello MrsMac14, Yes, these are universal. Are the valves at each end removable? Is it possible to remove the tap and the one way valve?

Are the connections within standard? Hello, Thank you for your enquiry. The supplier has told us: It will be fine, but if they are going to use it as a filling loop it should have the non-return and isolating valve on the set up. Hope that helps. Answered by: Screwfix Direction of fitting Hi. Need to fit this as a direct replacement.. There will also be a double check valve to prevent the backflow of water into the mains. A double check valve is so called because it contains not one but two internal spring-loaded anti-backflow mechanisms.

When installing an external filling loop, care must be taken to ensure that it is fitted the right way round. Otherwise, valve will stop the system from filling up. Some boilers, such as the Ideal Logic Combi range, feature integrated filling loops. They may look more complicated, but still function on exactly the same principle. Since all combi boilers have a direct connection to the mains anyway mains water is heated by the boiler for the hot taps , the filling loop may tee off from this pipe.

If the pressure is too low or keeps dropping, repressurising your boiler and central heating system is very easy:. If you keep having to use the filling loop to top up your boiler, you probably have a leak somewhere.

Faulty expansion vessels and pressure release valves are likely suspects inside the boiler. Either way, if your boiler pressure keeps dropping, you should get the leak fixed pronto. Regularly topping up the system with oxygen-rich mains water will encourage internal corrosion and the build-up of sludge.

If left untreated, this will gradually ruin your central system from the inside out, destroying the boiler and causing your radiators to develop leaks. This content is blocked. Accept cookies to view the content. DIY Plumbing supports the information, tips and guides you need with advertising.