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Discuss Incredibly noisy boiler from flue. in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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I've just had a Worcester Bosh 25-32 Heat Slave oil fired boiler installed and the sound from the flue is like a jet engine and can be heard 25 yards away at the bottom of my garden. I'm told oil fired boilers are quite noisy but this is ridiculous. Is this normal. I even spent a few pounds on a sound meter. The specs say it has a noise level of 55 decibels but I'm not sure if this means inside or outside. Its perfectly quiet inside the boiler house but outside its 66 decibels.

When it was fitted a part in a plastic bag called a damper which says must be fitted was left off, could this be the problem.

Any advice before I ring the manufacturer would be welcome, I would hate to have to live with it.
 
I've just had a Worcester Bosh 25-32 Heat Slave oil fired boiler installed and the sound from the flue is like a jet engine and can be heard 25 yards away at the bottom of my garden. I'm told oil fired boilers are quite noisy but this is ridiculous. Is this normal. I even spent a few pounds on a sound meter. The specs say it has a noise level of 55 decibels but I'm not sure if this means inside or outside. Its perfectly quiet inside the boiler house but outside its 66 decibels.

When it was fitted a part in a plastic bag called a damper which says must be fitted was left off, could this be the problem.

Any advice before I ring the manufacturer would be welcome, I would hate to have to live with it.

Hi. The installer should have left you the boiler manual, inside there it should say when to fit and when not to, depends on flue length, I'm looking at an old manual, which isn't upto date. Have a look through and report back. If in doubt phone technical tomorrow.

Update: flue damper only required on 32KW model if flue length is equal to or less than 4 metres
 
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Hi. The installer should have left you the boiler manual, inside there it should say when to fit and when not to, depends on flue length, I'm looking at an old manual, which isn't upto date. Have a look through and report back. If in doubt phone technical tomorrow.

Update: flue damper only required on 32KW model if flue length is equal to or less than 4 metres
Hi. The installer should have left you the boiler manual, inside there it should say when to fit and when not to, depends on flue length, I'm looking at an old manual, which isn't upto date. Have a look through and report back. If in doubt phone technical tomorrow.

Update: flue damper only required on 32KW model if flue length is equal to or less than 4 metres

Thanks for that, he did leave a manual and you are correct about the 4 metres. The flue is straight out of the wall at head height so it looks like damper needs to be fitted. Looks reasonably easy to do and I really hope it makes it a bit quieter. Thanks
 
Thanks for that, he did leave a manual and you are correct about the 4 metres. The flue is straight out of the wall at head height so it looks like damper needs to be fitted. Looks reasonably easy to do and I really hope it makes it a bit quieter. Thanks
I hope you will have the installer back, if you fiddle with it you will lose any protection over the whole installation, flues no matter how simple are for experts, this one ought to return at no charge
Centralheatking
 
Further to that, installing the damper without modifying the combustion settings may cause problems. As CHK says, the installer should return and put this right at no extra charge.

These things happen and I'm sure they will put it right but it is important it is done correctly.
 
Thanks for that, he did leave a manual and you are correct about the 4 metres. The flue is straight out of the wall at head height so it looks like damper needs to be fitted. Looks reasonably easy to do and I really hope it makes it a bit quieter. Thanks

In that case you need to get the installer back to put the damper in. This is not something you should do yourself as the CO2 will need to be adjusted again to suit new flue pull. It should say that in the manual as well but you might have missed that.
 
I think you are right, thanks for the advice.
Hi - did this work? I have exactly the same problem with the same boiler we have only just had fitted. Our neighbour is very unhappy (understandably) and we have moved and changed the flue twice, with no success. Help!!
 
Any pictures of the boiler and flue ?
 
Interesting to see where flue outlet is with regard to boundaries etc.

All the noise is, moving air, combustion and a fan motor.

Certainly not noisy, but then neighbours can be something else.
Fixed a toilet inlet valve, the top floor flat had lived with a siamp spraying into the cistern for over 3 years. Swapped it out for a new one. Downstairs collared me on the way out, telling me I couldn't leave it like that as it was too noisy. He was told, it was a standard valve, it had run over quiet for more than 3 years and to jog on as he wasnt the one paying my bill.

Normally an older boiler will shake the street when it wakes up.
 
My neighbour has just had a Grant oil fired combi boiler fitted . The noise from the flue is like a jet engine . I live in a terraced house and the flue is as close to the boundary as is allowed . I can hear it from inside my house . It is a nightmare !
 
Our neighbour just had a new oil condenser boiler fitted and the flue makes a very loud throaty noise - much worse than ours and other neighbours. I could cope with that but they have the thermostat set at17deg all night. The boiler continually ie often at 10 min intervals, fires up for 30-40 seconds through the night and wakes me up. They say the installer told them this was the most efficient way to run it. The flue outlet is about 1 metre above the boiler on the side of their garage so they don’t hear it but about 5 metres from our window. Any advice please? Is there a muffler for this?
 
Our neighbour just had a new oil condenser boiler fitted and the flue makes a very loud throaty noise - much worse than ours and other neighbours. I could cope with that but they have the thermostat set at17deg all night. The boiler continually ie often at 10 min intervals, fires up for 30-40 seconds through the night and wakes me up. They say the installer told them this was the most efficient way to run it. The flue outlet is about 1 metre above the boiler on the side of their garage so they don’t hear it but about 5 metres from our window. Any advice please? Is there a muffler for this?

Probably a blue flame burner, they are known to be a bit louder than other burners. A plume kit extension might help.
 

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