Rainwater entering boiler flue from gutter above

[genki1]

Hi,
Looking for some advice from the wonderful experts on this forum!

I've been experiencing rainwater entering my boiler via the flue on my back wall (pictured) and dripping down through the boiler and then causing damage to internal walls. Sadly, there is only one downpipe on the row of terraced houses that I live on, which belongs to next door. Due to the build up of debris and the fact it takes water from 5 terraced houses, the gutter often overflows in heavy rain, which then drips directly onto and into my flue. I cannot afford to move the boiler, so was wondering what the best solution might be. I've considered a boiler plume diverter kit? Or a boiler flue cover installed above? Obviously, we can keep trying to clear out the gutters, but this is not a long term solution and there is no possibility of installing additional downpipes at the back. I cannot do this as my lean to conservatory (installed before I moved in, as was the boiler) spans the whole of the back of the house.

Thanks so much in advance for your ideas.

 

[CountryFan]

Flue cover/rain guard might help. Plume kit would only help products of combustion, air intake stays the same. They’re only suitable for condensing boilers anyway iirc.

 

[JohnD]

Stand back and take a wider pic showing more of the roof and gutter please. Gutters should not routinely overflow.

 

[Mr Chibs]

Looks like the guttering has also come away from the union, hence the leaks at the joints.

I suffered similar issue at last house, and quickly made a temporary flue cover from a cut down section of 110mm soil pipe (block)
After cutting the pipe in half, down it's length (1ft long), I used a hot air gun to bend the last inch at 90° to allow it to be fixed to the wall.

It's like this type of thing.

Rain cowl

Solved the problem, so left it there.

 

[Harry Bloomfield]

I cannot afford to move the boiler, so was wondering what the best solution might be. I've considered a boiler plume diverter kit? Or a boiler flue cover installed above? Obviously, we can keep trying to clear out the gutters, but this is not a long term solution and there is no possibility of installing additional downpipes at the back. I cannot do this as my lean to conservatory (installed before I moved in, as was the boiler) spans the whole of the back of the house.

The gutter leaks need to be addressed first. The amount of leakage in the photo, also suggests there might be a buildup of water in the gutter, suggesting the fall pipe might be partially obstructed.