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Thanks Here is a photo taken from above. I’ve pixelated out some features. You can see all the green algae around the wall - sign of a lot of CO2? It’s also very noisy and roars like a jet engine (I know all oil boilers are and I cope with the noise of it didn’t smell so much). It’s...

What would the symptoms of a cracked heat exchanger be?

The engineer has been doing oil boilers for years so he should have good knowledge. It was probably installed before the new regs came in in 2004 so is sited incorrectly. The flue is actually nearer my window than theirs so they probably don’t get to experience the fumes. It’s good that people...

And if it’s burning oil inefficiently, that would lead to the PAH smell whereby the carbon has not been fully burned in the combustion process. Pretty toxic.

Thanks Chris, Yes they have to order oil all the time - twice if not more as much as me so it must be costing a lot of money. Plus the services at least 4x a year due to the toxic fumes. It needs replacing.

Thanks for the reply. The smell is definitely not sweet and damp, it makes me and other family members feel quite ill and I can’t use my garden at all when the neighbour’s boiler is on. I have to keep all my windows and doors closed as well even when it’s boiling outside. It also smokes badly...

Looking for some help. My neighbour has an outdoor oil boiler housed in a boiler house. The flue is positioned horizontally and is about 15cm from my boundary and about the same in height from the ground. It’s about 20 years old I think and was here when I moved. Lately though the smell and...