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Table of Contents
Why is there no filling loop on my boiler?
It happens when you have a leak in the system (water out of your taps does not count) and typically occurs at joints and valves. Because of the high degree of pressure in the system, you only need to have a very small hole to lose pressure gradually.
Where is my boiler filling loop?
Nearly all built in filling loops are located directly underneath the boiler itself. Below is an image of the built in filling of an Ideal Logic combi boiler. An external filling loop can be located anywhere on the central heating circuit which gives it great location flexibility.
Does a system boiler have a filling loop?
Most combi and system boilers require a pressure of 1 – 1.5 bar in order to operate. Open the valve or valves on the filling loop. You should hear the sound of rushing water – the system is filling up. You should also see the needle on the pressure gauge rise.
Boiler Pressure Drop
The filling circuit itself consists of either a rigid piece of pipe or a braided hose. A filling loop can either be part of the boiler itself or attached nearby. Filling loops usually have a shut-off valve on one end and a double check valve on the other.
Overview filling loop
With closed central heating with a combination or system boiler, there is no flow and expansion tank in the attic. Instead, the system is powered by the mains.
The requirement for the connection to be temporary is because the Water Regulations prohibit water from flowing back into the mains, creating a risk of contamination. The risk of contamination of a central heating system is even greater due to the corrosion and sludge that can accumulate within a central heating system and/or the presence of anti-corrosive and biocidal chemicals. A permanent connection to a central heating is therefore not permitted and also not possible, since cold tap water is likely to have a higher pressure than, for example, the central heating of a standard combination boiler when cold.
External fill loops
A generic external inflation loop is simply a length of braided tubing with compression fittings at each end. There will be at least one shut-off valve used to control the flow of water. There will also be a double check valve to prevent water from flowing back into the main line. 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, ensure that it is installed in the correct position. Otherwise the valve stops filling the system.
Internal fill loops
Some boilers, such as B. the Ideal Logic Combi series, have integrated filling loops. They may look more complicated, but they still work on exactly the same principle. Since all combi devices have a direct connection to the power grid anyway (the tap water is heated by the boiler for hot water tapping), the filling circuit can branch off from this line.
How to use the fill loop
If the pressure is too low or continues to drop, you can easily repressurize your boiler and central heating:
First, identify the pressure gauge on your boiler. Most combination and system boilers require a pressure of 1 – 1.5 bar to operate. Open the valve or valves on the fill loop. You should hear the sound of rushing water – the system is filling. You should also see the needle on the manometer go up. When the needle indicates the target pressure, close the fill loop. Use the controls on the front of your boiler to clear any low pressure error codes. Depending on the make and model of your boiler, this may or may not be necessary. Congratulations – you have heating and hot water again!
Why do I have to keep refilling my boiler?
If you keep having to refill your boiler via the fill loop, you probably have a leak somewhere. The leak is either in your central heating (one of the joints or radiators) or in one of the components of the boiler. Faulty expansion tanks and pressure relief valves are likely suspects inside the boiler.
Anyhow, if your boiler pressure continues to drop, you should have the leak repaired immediately. Regular refilling of the system with oxygen-rich tap water promotes internal corrosion and sludge formation. Left untreated, this will gradually ruin your central system from the inside out, destroying the boiler and causing your radiators to leak.
Why can’t I Repressurise my boiler?
You might have noticed the pressure of your boiler drops as soon as you re-pressurise it. The most common reasons for lack of pressure include a leak somewhere in the system or a damaged pressure relief valve. If you’ve tried to re-pressurise the system once and it hasn’t worked, don’t keep trying it.
Boiler Pressure Drop
Once done, you can complete the process with the following steps:
Turn off your boiler and let it cool down completely. Locate the inflation loop and check that both ends are securely fastened. A leak in a valve can be a reason for pressure loss. Therefore, check if there is water around the valve. Open both valves to allow cold water to enter the system. Keep an eye on the pressure gauge. Close both valves when the pressure gauge reaches 1.5 bar Filling loop if not built-in Turn the boiler back on and check the pressure again
There are two types of fill loops: external and built-in. An external one will need to be fitted by you, so you should attach it in step 2 and then remove it before turning the boiler back on in step 6.
By repressurizing your boiler you allow more water to enter the system from the main supply. If you accidentally pressurize the system too much, don’t panic. You may need to bleed your radiators to get the pressure back down.
You should keep an eye on the pressure over the following days and weeks to make sure the pressure doesn’t drop again. If this is the case, chances are you have a leak.
If you get stuck trying to re-pressurize your Viessmann boiler, you can always contact us for assistance.
How do I add water to my boiler?
When the boiler has cooled down, locate the feed water pipe. This can be found off the cold water line connecting to the pipe that leads to the tank. Open the feed water valves carefully. Keeping an eye on the sight glass, slowly pour in clean water until it meets the right level mark.
Boiler Pressure Drop
Boilers are used to generate hot water and steam for homes and businesses. These systems require wood, electricity, oil, gas, or propane to function. Household boilers sometimes require maintenance, so knowing how to put water in a boiler is of the utmost importance for anyone who owns one.
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video of the day
When the boiler water is running low
Boilers must have enough water to run properly and adding water to a boiler is important to avoid overheating. A sign that the appliance is low on water is when the house is not heating properly. This situation is exacerbated when the thermostat is continually adjusted; This can damage a boiler beyond repair. The problem is known as “dry firing,” which can cause the tank to overheat and then crack.
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There are other symptoms that could indicate low water levels in boilers. These include strange noises or smells that can result from tank damage. Some boilers have built-in sensors that detect overheating. These sensors will automatically shut down the boiler, so these symptoms may not appear.
Boiler shutdown can also be due to other issues such as: B. a malfunctioning pump, a closed valve or a defective thermostat. These problems are red flags that indicate the need for service or repair. Other signs are when the water is not hot enough or there is no water or little pressure.
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Adding Water to a Steam Boiler
It’s a good idea to check your boiler every few weeks or sooner if it’s misbehaving. Check the boiler’s pressure gauge/sight glass, which is usually located on the side of the unit. It looks like a narrow glass tube no more than 10 inches high. Some boilers have automatic water supplies, while older ones require manual topping up. Boilers with manual valves should be checked more frequently, at least once a week.
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Whenever the water level is at the “Add” mark, some water needs to be refilled. The system must be switched off and completely cooled before any maintenance work, e.g. B. the addition of water can be carried out. The feedwater shut-off valves should be located near the boiler. Turn them off and wait.
When the boiler has cooled, locate the feed water line. This can be found on the cold water line that connects to the pipe that goes to the tank. Carefully open the feed water taps. Keeping an eye on the sight glass, slowly pour in clean water until it reaches the correct level mark. Note that steam jets do not need to be vented.
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How to bleed radiators
Once the correct water level is reached, you need to “bleed” the radiators of a hot water system. Steam systems do not need to be bled as they use a different technique to remove air from the system, but identifying working radiators is a similar process.
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For both types of systems, this determines whether the system is running properly. Turn on the central heating and then feel every radiator in your house. After that you can switch off the heating.
For a hot water system, first put on work gloves and locate the vent valve of each radiator if necessary. This can be found on one side of the cooler at the top. A radiator key is required for this. Use the wrench to loosen the valve screw to release air pressure.
At this point you should hear a hissing sound. Don’t worry – it’s just the trapped air that escapes and the water that gets in. After the valves are loosened and the hissing stops, tighten the valves, wipe up water from the bottom, and turn on the system. Your boiler should be set up to work properly.
How do I know if my filling loop is closed?
Filling loops can come in different designs and can be detached from the boiler when not in use. With the black levers in this position the valves are OFF/CLOSED. Find the filling loop and check that both ends are securely attached.
Boiler Pressure Drop
If you’ve noticed that you don’t have heating or hot water, the problem could be your boiler pressure.
If your boiler pressure has dropped, you may need to repressurize your boiler.
You can check the pressure of your boiler and repressurize it yourself without having to call a gas technician.
This post tells you everything you need to know when it comes to repressurizing a combi boiler.
How do I check my boiler pressure?
You can check your boiler’s pressure by looking at the small round pressure gauge on the front of your boiler. You will notice a green SAFE zone and the maximum pressure with a red zone. Some boilers have digital pressure gauges and these indicate if the pressure is too high or too low by flashing the reading on the boiler display screen.
The pressure of your combi boiler should be between 1 and 1.5 bar when the system is off and the water is COLD. It is perfectly normal for your meter to go up when your heating system is on and the water is hot.
If your pressure is less than 1 bar, it is possible that you have lost water from your system through a leak. If you find a leak or suspect you have one you should call us on 0116 287 8000 and we can investigate and fix the problem. If you think that the pressure has gradually dropped over time, you can refill the boiler pressure yourself.
How can I repressurize my boiler?
Every boiler type and model is slightly different so please check your boiler manual for instructions on how to re-pressurize your combi.
Turn off your boiler and let it cool down completely
Check your heating system for leaks
A good place to check is near your radiators and plumbing. A leaking radiator valve could be a reason for the loss of system pressure. Also check your carpets and blankets for damp spots and air conditioning closets for other leaks.
If everything seems fine, continue to the next step. If you find a leak you should call us on 0116 287 8000
External fill loop type
A boiler fill loop makes a temporary connection to the mains, allowing you to re-pressurize your heating system and fill it with water.
Filling loops are available in different designs and can be removed from the boiler when not in use.
When the black levers are in this position, the valves are OFF/CLOSED.
Locate the inflation loop and check that both ends are securely fastened.
Open both valves by rotating them 90 degrees so they are in line with the pipes, allowing cold water to enter the system
Keep an eye on the pressure gauge and close both valves when the pressure gauge reaches 1.5 bar
Remove the inflation loop and reinstall all caps (if applicable).
Turn the boiler back on and check the pressure gauge again
Depending on the make/model of your boiler you may need to reset your boiler – if you are unsure consult your boiler manual
Open a hot water tap and see if your boiler is on and your water is getting hot
Type of internal fill loop
The Worcester Keyless Filling Link is a quick and effortless way to repressurize your heating system without the need for a separate filling loop or key. The keyless filling connection is quick to find and makes it easy to repressurize your heating system
Locate the small BLUE lever under your Worcester combi boiler
under your Worcester combi kettle Pull the lever down and hold it down
Keep an eye on the pressure gauge and release the lever when the pressure gauge reaches 1.5 bar
Turn the boiler back on and check the pressure gauge again
Depending on the make/model of your boiler you may need to reset your boiler – if you are unsure consult your boiler manual
Open a hot water tap and see if your boiler is on and your water is getting hot
By repressurizing your boiler you allow more water to enter the system from the main supply. If you accidentally pressurize the system too much, don’t panic. You may need to bleed your radiators to bring the pressure back down to 1.5 bar.
You should keep an eye on the pressure over the following days and weeks to make sure the pressure doesn’t drop again. If this is the case, chances are you have a leak.
Below is a really helpful video from Worcester Bosch on how to top up your boiler pressure using fill loops, links and keys.
https://www.worcester-bosch.co.uk/heating-advice/boiler-pressure
Is 3 bar too high in boiler?
High boiler pressure isn’t dangerous, even if it’s showing as three bar on the pressure gauge. In most cases, the boiler will turn itself off if the pressure goes about a certain level and a working PRV should successfully control the pressure, preventing it from getting too high.
Boiler Pressure Drop
When your boiler heats the water for your radiators and faucets, the water expands. Because of this, you will find that your boiler pressure is different when the heater is off than when it is on. A pressure relief valve can control this jump by automatically venting the extra pressure from the system.
Boiler pressure is controlled by the expansion tank, the balance between air and water in your central heating system. Not enough air in your expansion tank and the pressure can get too high. causing the water to leak out of your pressure relief valve. Too much air could cause over-pressurization in the system, this could also cause water to leak out of the pressure relief valve. For this reason, it is important for the installer to determine the cause of the high pressure in your boiler.
What happens if boiler pressure is too low?
Symptoms of boiler pressure loss
You’ll know the boiler pressure is too low in your system, if: There’s no heating or hot water. Your radiators aren’t warming up properly. The dial on the pressure gauge has fallen.
Boiler Pressure Drop
In this blog we will look at:
How high should your boiler pressure be?
How to know if you have a problem
And how to fix your boiler pressure if it’s too high or too low.
02.10.2020 | Help me with maintenance and repairs
Is it easy to Repressurise a boiler?
Repressurising a boiler is a relatively simple job and can be done on a DIY basis. However, there are two main ways to top up your boiler, either via an external filling loop or an internal filling loop (either keyed or keyless) – and both methods are demonstrated in the video and the step-by-step guide below.
Boiler Pressure Drop
Repressurizing a boiler is a relatively simple task and can be done on a do-it-yourself basis. However, there are two ways to top up your boiler, either via an external fill loop or an internal fill loop (either keyed or keyless) – and both methods are demonstrated in the video and step-by-step guide below.
Topping up a boiler with cold tap water is a routine aspect of maintaining a boiler’s life cycle. You may have noticed that your heating is less efficient or that the pressure gauge on your boiler has turned red.
If in doubt about how to repressurize your boiler, consult a professional.
If you are not sure which filling circuit you have, ask your installer who can confirm this for you.
(MORE: How to improve the efficiency of your central heating system)
How to repressurize a boiler with an external fill circuit
Your boiler system may have two valves and therefore will require an external filling circuit while it is being re-pressurized (Image credit: Future)
If you have a system with an external fill circuit, you will see two valves, one from the cold water mains and a second connected to the heating system. They also have a silver braided hose to connect the two valves so you can repressurize the kettle.
Take the hose and attach it to each side of the valve.
Attach the external fill loop to the valves like this (Image credit: Future)
Once the hose is securely attached, fully open the valve for the cold water network, followed by the valve that connects to the heating system. Leave the valves open until the boiler pressure is just over 1 bar. Then you can close both valves. Don’t worry if you went too far as this can be corrected later.
Leave the hose connected while you walk around and bleed all the radiators in your house. Then go back to the boiler and check the pressure again – you may need to top it up again.
When you are satisfied that the pressure is 1 bar, make sure both valves are closed and remove the connecting hose. Do this over a bucket as there may be some water in the hose.
The ideal boiler pressure is 1 bar. Don’t worry if the pressure gets too high, you can reduce this by bleeding your radiators (Image credit: Future)
Repressurize a boiler with a coded internal fill circuit
If you have such a system, you have received a key (you may have received it during installation or it is in the hatch under the boiler).
Then you have to figure out where the key fits. This can vary depending on the boiler, but on a Worcester Bosch model the connection is on the front right hand side.
Your boiler may have an encrypted internal fill loop (Image credit: Future)
Align the arrow on the key shank with the open padlock in the opening, once the key is fully engaged, turn to the closed padlock position. Once the key is in place, slowly open the white faucet to the left of the key hole and watch the pressure increase. As soon as the pressure is 1 bar, close the tap.
Turn the key back to the open padlock position and carefully remove the key. Some water may drip out when removing the key, which is normal.
Repressurize a boiler with a keyless internal fill circuit
This is the quickest and easiest way to repressurize a boiler and is commonly used on Worcester Bosch combi boilers (Image credit: Future)
The keyless fill connection can be identified by a blue lever on the bottom of the boiler. To repressurize the system, simply pull the lever down until the pressure is just over 1 bar and then release.
Whichever method you use to repressurize your boiler, don’t worry if you’ve gone too far, you can release some pressure later by bleeding your radiators.
What does filling loop look like?
Some boilers & have a Standard filling loop or filling tap on pipework: This will usually look like a small silver braided hose linking two of the plumbing & heating system pipes together.
Boiler Pressure Drop
As your local Bristol Boiler Engineer, the management of Reactivate Boiler and Central Heating Repairs wanted to create a resource to help the fine folk of Bristol with small central heating maintenance tasks. This particular one relates to the general problem of how to refill a boiler.
Some water heaters and boilers have a standard fill loop or tap on the plumbing: This usually looks like a small silver braided hose connecting two of the plumbing and heating system pipes together. It’s usually on the plumbing just below the boiler, although it can sometimes be found under the kitchen sink or in the drying cupboard – there’s no hard and fast rule on where to put these appliances, so you may need to look around.
A fill loop usually has a tap or some sort of small lever at each end of the hose, although sometimes it’s a flathead screwdriver. Using a fill loop arrangement that opens both faucets will refill your system, it usually refills very quickly so be careful not to run it for too long. Very important: remember to close both taps after refilling and remove the hose if possible.
Can a boiler lose pressure without a leak?
Boiler Losing Pressure, No Leak
In 99% of cases, a boiler losing pressure means a leak — it’s as simple as that. Unless the dial sits at 0 even when topped up (which could be a sign of a faulty pressure gauge), there’s a leak somewhere – even if you can’t see it in the boiler or the heating system.
Boiler Pressure Drop
The good news is that usually just one failure causes low boiler pressure. The bad news is that adding water without fixing the problem doesn’t solve anything. In any case you are in the right place because today we are going to explain how to fix low boiler pressure and restore the correct pressure value.
If your boiler pressure continues to drop, there’s a good chance you’ve been prompted to use the fill circuit to “top up the boiler”. My advice would be: don’t.
Hopefully the installer has dosed your new boiler system with inhibitor and fitted it with a scale reducer (in hard water areas) and a magnetic system filter.
An inhibitor breaks down any bad particles in the system so the scale reducer can catch them. Each time you fill the boiler with cold tap water through the fill loop, you dilute the inhibitor in the system.
Here are some of the reasons that cause a gas boiler to lose pressure. And if you need a boiler repair specialist to visit you at home or in your company, of course, contact us.
We’ll go through the possible reasons why your boiler keeps losing pressure, but let’s look at the DIY solution first…
The [DIY] solution if your boiler pressure keeps dropping
In 99% of cases, modern combi boilers constantly lose pressure due to leaks, whether in the boiler itself or elsewhere in the heating system.
Before you spend £100 on a repair technician, there is a DIY solution that can depressurize your boiler – it comes in the form of Fernox F4 leak sealant.
This sealant will migrate around your hot water system (including the boiler) and work its way into small gaps (i.e. the leaking area).
Fernox is a well known brand in boiler protection/repair and the F4 leak sealant will work within 1 to 24 hours and hopefully stop your boiler from depressurizing.
Do you need a new boiler? Get a FREE fixed on-screen quote with flexible financing options from Heatable. Price equality guaranteed.
Boiler loses pressure, no leak
99% of the time, a loss of pressure in a boiler means a leak – it’s that simple. If the dial doesn’t read 0 even after filling up (which could be a sign of a bad pressure gauge), there’s a leak somewhere – even if you can in the boiler or in the heating system does not see.
Regardless of whether you have an oil, system or combi boiler, pressure loss is usually directly related to a leak in boilers. We have already created a guide here on why boilers leak and how to find a boiler leak.
Causes of the pressure drop in your boiler
#1 – Faulty pressure relief valve on boiler
Most modern boilers operate at 1.0-1.5 bar. But their pressure can reach 3 bar when there is a problem, such as a boiler leak. A pressure relief valve senses this abnormal change in system pressure and relieves it. If the PRV has failed, this will cause the boiler to lose pressure.
#2 – Automatic vent leak in heating system
Central heating systems can become air locked over time (and they certainly will when you top them off).
Bleeding the radiators in your home or office is the best solution, but automatic bleeding (which is usually located inside the boiler housing on newer station wagons) can also help combat this problem, which ultimately affects the boilers.
However, if the automatic vent is defective, it could lose pressure through a leak.
#3 – Leaky radiators, towel rails and radiator valves
This is the most common cause of pressure loss in a combi boiler. Tiny leaks can cause your system to depressurize.
We recommend a visual inspection of all radiators, radiator valves and towel rails. If there are signs of water leaking, then that’s probably the culprit. A small whistle on a radiator valve is enough to cause a loss of pressure in your boiler.
If the connections are extremely loose, (gently) tightening will usually solve the boiler pressure problem. If it doesn’t, the culprit needs to be repaired – or replaced.
#4 – Radiators are full of air
If you have done any work on your central heating system, some air may have collected in the radiators and towel rails. You can release this system pressure with a vent key.
To vent radiators and towel rails, open the vent slightly with the key. You will hear trapped air hiss. Once the air stops, water will start dripping (or squirting out if you opened the vent too far); This is your signal to close the vent.
Repeat this process on every single radiator and towel rail on your property. It’s worth taking a small container to catch dripping water and a towel to protect carpets.
Also remember that if you are constantly removing air, the boiler pressure will drop every time you bleed the radiators.
#5 – Shady Expansion Ship
From time to time, expansion tanks need to be repressurized. If they are not, they can affect the pressure of the boiler in your home. In some cases this could be the reason for boiler pressure loss.
However, a more likely cause is that the Schraeder valve is leaking. This is the valve on the boat that looks just like the valve on your car hose. A defective valve can lead to pressure loss in a boiler.
Another possibility is that the membrane on the tank has deteriorated over time and the tank pressure is lost there.
If repressurizing the expansion tank doesn’t work, or the suspect is a diaphragm or Schraeder valve, you’ll need to replace the tank entirely to prevent the boiler from losing pressure.
#6 – Boiler solder joints are leaking
As we have already mentioned, leaks are the most common reason for a boiler to lose pressure. If your system is particularly old, there’s a good chance the solder joints have weakened, which could lead to a new leak. It only takes a tiny leak for a system to start depressurizing.
If you can find the leak, call a Gas Safe engineer to come by and re-solder the connection to stop the leak. Use the fill loop to fill up the boiler and you should see the pressure increase back to where it needs to be. Then monitor the pressure gauge for pressure loss.
#7 – The pressure gauge on your boiler is broken
It’s unlikely, but it happens – there’s a chance that the pressure gauge on the front of the boiler won’t show the pressure correctly. This condition is quite dangerous, especially when the wrong reading causes you to constantly refill your system.
If you top up the boiler and the pressure gauge doesn’t respond, it’s probably broken – otherwise you would surely notice a leak of this magnitude.
Do you need to replace a defective boiler?
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What the loss of pressure in your boiler means – and what you have to do to fix it
Boiler keeps losing pressure when the heater is on
When you turn on your heating, pipes, fittings and radiators expand and the boiler pressure increases. So a heating system may not leak when it’s off, but may start leaking when you turn it on.
Boilers slowly/quickly lose pressure
The rate at which your boiler loses pressure will determine how bad the new leak is. So if your boiler is slowly losing pressure (i.e. you can’t see the gauge going down but the pressure is going down overnight) the leak is small.
If you see the pressure gauge going down, your boiler is rapidly losing pressure and the leak is large. You must have the boiler repaired as soon as possible as it could cause water damage to your home or business.
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Is low boiler pressure dangerous?
It depends on the cause of the boiler pressure loss. There is a chance that the root problem is a leak, and leaking water can damage the electronics, the structure of your home, and your belongings.
If the pressure drop you’re seeing is caused by a faulty pressure gauge, that’s just as dangerous, because then you won’t know the actual boiler pressure.
Boiler also loses pressure AFTER repairs
If you have resolved the above issues but are still seeing low boiler pressure and the unit is not under warranty, you may need to consider replacing your boiler entirely.
And while installing a new boiler is by no means cheap, it can cost you less than unsuccessfully replacing one faulty part after another (or worse, getting a permanent leak that damages your property).
To get an idea of how much it can cost to replace your faulty appliance, you can read our in-depth boiler replacement cost guide.
On average, however, you can expect to pay at least £2,000, including installation. However, remember that this number depends on a lot of variables, such as:
Your existing and new types of boiler — are you exchanging a combi for a combi? Or do you have an older, conventional boiler but would like a combi instead? In the latter case, you may pay more.
— Are you swapping a station wagon for a station wagon? Or do you have an older, conventional boiler but would like a combi instead? In the latter case, you may pay more. Whether you need to move your boiler to a new location – Moving your boiler will incur additional costs.
— Relocating your boiler will incur additional costs. Where you live – If you’re a Londoner you’ll pay more, sorry.
— If you’re a Londoner, you pay more, sorry. The list goes on.
To get an accurate quote you can call a local installer and give them this information. You can now also get a fixed price on your screen by completing Heatable’s anonymous 90-second questionnaire (10-year guarantee included).
What happens next when you notice a loss of boiler pressure?
Having trouble understanding why your boiler is losing pressure? Or do you need more advice on how to fix the daily pressure drop in your boiler?
Can I leaving filling loop open?
Some people find it more convenient to leave the filling loop attached or next to the boiler. This is actually against regulations, as they state your filling loop needs to be disconnected from your boiler when it’s not in use. If it’s left on, you can cause irreparable damage to your filling loop boiler.
Boiler Pressure Drop
Luckily, even if you think you don’t know enough about how boilers and central heating systems work, using a boiler fill circuit is a surprisingly easy task.
You need one if your boiler pressure has dropped too much. Anything below half a bar has a major impact on the operation of your boiler. If recently installed, your fill loop can be secured with blind caps.
You don’t need anything else to repressurize your boiler as you can simply turn the fill loop valves with your hands. However, you must ensure that the valves are in the off position before beginning.
Use your hands to make sure the fill loop is tight. Turn a valve to match the direction of the line. Slowly turn the other valve on the fill loop. Water begins to flow through the main line and into your system. Water should start flowing through the system. In this case, the pressure of your boiler shown on the pressure gauge should increase. As soon as it reaches 1.4 bar, close both valves again
Some people find it more convenient to leave the fill loop on or near the boiler. This is actually against the regulations as they state that your filling circuit must be disconnected from your boiler when not in use. Leaving it on can irreparably damage your fill circuit boiler. Also, it can be dangerous if you have children on the property. You can accidentally tap the fill circuit valves, which could allow water to flow back into the system, increasing boiler pressure and causing further problems.
Should filling loop be open or closed?
After use the valves on the filling loop should be closed, the metal braided filling loop removed and the valves capped. The majority of people don’t do this so there is always a chance that the valves can be opened accidentally or be faulty.
Boiler Pressure Drop
The first step is to turn the faucets so that they are in the off position. If it’s a round tap, turn it clockwise. If it has a lever, turn it so that it is not in line and at 90 degrees to the valve body. If it’s accidentally turned on, you’ll hear the water flow and hear the flow stop as you turn the valve to the correct position.
The filling loop underneath is open
The filling circuit underneath is closed
It doesn’t have to be that strong to increase the pressure, even slightly open is enough.
To fix this you need to turn off both valves (or one if you only have one). This should no longer overflow the metal pipe on the outside.
The metal overflow pipe should only overflow when the pressure is above 3. So if the pressure drops below 3 again, the water should stop.
If it doesn’t then you may need a new safety valve as these are notorious for not re-closing once opened. This is a job for a gas safety engineer, not a DIYer.
BOILER KEEPS LOSING PRESSURE – WHY AND HOW TO FIX – Plumbing tips
See some more details on the topic can’t find filling loop on my boiler here:
Can’t find Filling loop | PlumbersForums.net
The installer may have taken the filling loop off as this is a water bye law requirement. If the boiler is in the atic, the installer may have …
Source: www.plumbersforums.net
Date Published: 6/23/2021
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Repressurise Your Boiler Even Without a Filling Loop
If you can’t find the boiler filling loop, it’s possible that your unit doesn’t have one. Here’s what to do if that’s the case. How to repressurise when there’s …
Source: justboilers.com
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Low boiler pressure but no visible filling loop – MyBuilder
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Date Published: 5/21/2021
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What’s a Boiler Filling Loop? Here’s what they are and how to …
Heard about filling loops in a boiler and wonder exactly what their … If you can’t find it, try getting in touch with the manufacturer.
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Date Published: 7/9/2022
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Boiler Pressure Drop
An external filling loop can be located anywhere on the central heating circuit which gives it great location flexibility. In many instances the …
Source: loveyourboiler.com
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Your Handy Guide To Boiler Filling Loops – Plumbing Force
You can easily find a filling loop in your local hardware stores. If you are having a tough time finding a filling loop, you can try to target …
Source: www.plumbingforce.co.uk
Date Published: 3/28/2022
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Boiler pressure on zero…boiler not firing…can’t find filling loop??
When I had my boiler (new one) moved to attic, I got the guys to put the gauge, Mag Filter and fill loop in airing cupboard.
Source: community.screwfix.com
Date Published: 3/15/2021
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Can’t find filling loop! – Ultimate Handyman
I have a Glowworm 24cxi combi boiler. I removed a radiator to do some decorating, put it back on and turned boiler back on… and it won’t …
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What is a Boiler Filling Loop? – Boilerhut
How do you use a boiler filling loop? · Using your hands, make sure that the filling loop is fixed firmly into place · Turn one valve so that it matches the …
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Can’t find Filling loop
There is usually a flexible braided stainless steel hose that connects from the incoming cold pipe to the central heating return pipe. This is called a fill loop.
Whereby this connects flexibly with one. or possibly at both ends, there will be a shut off valve, this has a piece of plastic that acts as a handle, by turning this handle pressurized water enters the central heating circuit from the mains and increases the pressure, this increase shows on the pressure gauge.
Are you trying to increase the pressure shown on the pressure gauge because the boiler is not working?
Also, depending on who installed the device, there may not be a plastic insert, just a screwdriver slot. If this is the case, be careful not to let the flat blade screwdriver slip out of the slot and go through your hand .
The installer may have removed the fill circuit as this is a water law requirement. If the boiler is in the attic, the installer may have placed the fill loop in a more convenient location, e.g. B. under the kitchen sink.
Once you locate the shutoff valves, turn them slowly so you don’t over pressurize your system.
Much luck
Tim
Repressurise Your Boiler Even Without a Filling Loop
Written by JustBoilers.com Experts | Last update: July 2022
We all love to stay cozy and warm at home at any time of the year. That is why it is so important to keep your boiler in perfect condition. It is essential for your comfort as it provides a constant flow of hot water, heats your radiators and generally makes the place feel like home. But what to do when one of the most common boiler failures occurs: an unexplained pressure drop?
Let’s take a look at everything you need to know about re-pressurizing a boiler. We explain why this is important, what could be causing the pressure drop, and how to troubleshoot boiler pressure issues. Soon you will know how to keep the heating running even if there are imminent pressure problems.
Why might you lose pressure?
Loss of pressure is more common than you might think, especially if you’ve just been caught unawares by a boiler that suddenly refuses to light. It happens when you have a leak in the system (water from your faucets doesn’t count) and typically occurs at connections and valves. Due to the high pressure in the system, a very small hole is enough to gradually relieve pressure. This can complicate the search for the cause of the leak, which is compounded by how quickly the hot water droplets evaporate.
Why is pressure loss important?
If your boiler loses pressure, it won’t convert fuel to heat as efficiently. This will then put more stress on the internal components of your boiler and potentially increase your heating bill.
If the pressure drops sharply, the boiler stops heating. You then have a cold house and no hot water, as well as a boiler that you need to learn how to troubleshoot.
Can you pressurize a boiler too often?
Yes, you certainly can. You may think that as long as you learn how to repressurize a boiler, everything else will take care of itself. Unfortunately it doesn’t work that way.
Repeated repressurization leads to a build-up of deposits, namely sludge-like build-ups, in your boiler. This then puts a greater strain on it, reducing its service life and efficiency. Two things you don’t want to let happen if you want to reduce the likelihood of a costly repair call.
Does repressurizing the boiler always work?
Unfortunately not, but it’s definitely worth a try. Over time, it’s common to get a small leak from a valve or connection in the boiler. In these cases, isolation from the rest of the system and repressurization will prove that this is the case.
If you repressurize the system as a whole and you still experience repeated pressure drops, chances are you have a leaking valve, pipe or radiator that needs your attention. Finding such leaks can be time-consuming, so it’s always worth hiring a professional. They know what to look for and often have imaging equipment that allows them to detect hot water through floorboards and insulation.
What happens if you pressurize your boiler too much?
It is not advisable to over pressurize a boiler as it is designed to operate within a specified pressure range.
For safety reasons, boilers are usually supplied with pressure relief valves that vent to atmosphere if the pressure gets too high. This is to prevent large pressure build-ups from causing ruptures in the boiler and the explosion that is likely to accompany it.
Here’s how to prepare for reloading
Repressurization is a delicate process that must be done properly. To make sure you’re prepared, it’s a good idea to work through the following hints and tips.
Check all vent valves and fittings on your radiators to make sure they are closed. This will ensure you have a closed circuit (barring potential leaks) when you need to top up with water.
You should also note the current pressure so you have it for reference. Also, check the optimal running pressure in the manufacturer’s guidelines. This then tells you how much to add to your system to get it working as you want again.
Now that you know how to repressurize a boiler you should be good to go. But there is one more thing we need to talk about: the boiler filling circuit.
What is a boiler fill cycle?
The kettle fill loop is a small braided hose with a valve attached. It is located in your boiler and is used to add extra water to the heating system.
The volume of your system is fixed, so adding more water increases the pressure. By opening the boiler filling circuit valve and monitoring the start of the pressure rise, you can re-pressurize in just a few seconds. Just make sure the valve is tightly closed before firing the boiler.
Boiler fill loops are used when you install and service a boiler or when you drain or bleed your system.
If you can’t find the boiler fill loop, your device may not have one. Here’s what to do if that’s the case.
How to restore pressure when there is no boiler fill circuit
Some older style boilers are not equipped with boiler fill loops which can make it quite difficult to know what to do.
Some boiler systems work with a storage tank designed as a hot water storage tank. The filling loop should not be placed there, but there are cases when they are installed on the bottle. You are looking for a braided hose with a small inflation valve.
Pressurizing the boiler again: The hot water cylinder
Some older design boilers have a separate water tank with hot water. If you notice that you don’t have a fill loop but do have a large metal cylinder that’s warm to the touch, this is where you need to start looking.
What you are looking for is a braided hose with a small valve attached to it. Opening this valve while monitoring the pressure on the boiler will add extra water to your hot water tank. The tank is part of your overall heating system and when you refill it, the pressure in the system is increased and therefore your boiler is pressurized again.
Are you putting too much pressure on your system?
Don’t worry, this will happen. If you’ve exceeded the recommended working pressure by about 0.5 bar, you can remove it from the system by bleeding a radiator with a radiator wrench to repressurize your boiler.
What to do if there is a constant loss of pressure?
Last but not least, if you find yourself constantly losing pressure, consult a professional to have the leak diagnosed and repaired. It will always save you money in the long run.
Get in touch with one of our qualified technicians to schedule an appointment and we’ll fix the problem in no time.
Sources used:
https://www.homebuilding.co.uk/advice/how-to-repressurise-a-boiler
How to Repressurise a Boiler [Without Paying an Engineer or Boiler Expert]
https://www.britishgas.co.uk/home-services/boilers-and-heating/guides/boiler-pressure.html
https://singletrackworld.com/forum/topic/low-pressure-in-boiler-but-no-filling-loop/
Boiler Pressure Drop
boiler pressure drop
Boiler pressure drop, a boiler’s pressure can drop for numerous reasons, let’s not focus too much on why but on the process to get it back to where it should be (1.5 bar).
First, you need to identify two key components:
The fill loop
The manometer
Fill loop, what is it and where can I find it?
The component of the central heating system that connects the cold main line (pipe) with the primary central heating circuit (heating line) is called the filling circuit.
There are two main types of fill loops:
Built-in
External
Built-in fill loop
Built-in filling loops differ in design from manufacturer to manufacturer, but their basic function is the same. Almost all of the built-in filling loops are located just below the boiler itself.
Below is a picture of the built-in charge of an Ideal Logic combi boiler.
External inflation loop
An external fill loop can be placed anywhere in the central heating circuit, giving it great flexibility in placement.
In many cases the filling loop on the piping is within 1 meter of the boiler.
Again, external fill loops may vary in design, but they all share similarities to the one pictured below.
Pressure gauge, what is it and where can I find it?
Your boiler has one of two types of pressure gauge:
hydraulic
Digital
Hydraulic pressure gauge
A hydraulic pressure gauge is usually located at the front of the boiler, but can also be located under the boiler.
This type of pressure gauge gives a visual indication of the system pressure since water in the primary circuit (heating system) directly affects the position of the pressure gauge needle.
Digital pressure gauge
A digital pressure gauge shows a pressure reading on the boiler display itself. This is displayed either as digits or as a virtual gauge.
The downside or limitation with this type of pressure gauge is that the boiler must be on for the pressure to be read. This can be a problem when the power supply is interrupted, for example during renovations.
boiler pressure drop
When the pressure on your boiler has dropped below 0.75 bar, a safety pressure switch will prevent the boiler from igniting, leaving you without heat and hot water until the pressure in the central heating system has risen to 1 bar or more.
The process for this is very simple, it can be achieved in 5 simple steps:
Identify the fill loop Identify the pressure gauge Rotate the fill loop shut-off handle 90 degrees, at this point you will hear water entering the central heating system (some fill loops have 2 handles, rotate both handles 90 degrees) Bring both handles in place When the pressure gauge reads 1.5 bar (this is the ideal pressure when the central heating is cold) Press the reset button on the front panel of your boiler (many models will reset automatically)
It’s that simple. If you’re still unsure, watch this short video
We hope you found this article helpful and informative.
Please take the time to share this article on your social media profiles, you never know who in your family or friends might have the same problem with their heating system.
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