Water coming in flue pipe after boiler installation

[tamz]

Every condensing boiler made by every manu has the flue fitted at an angle of approx 5 degrees sloping back to the boiler so that the condensate in the flue gas (from the inner pipe) falls back to the boiler and then to drain.
This means that the air intake (outer pipe also slopes to the boiler therefore any driven rain will enter the air intake which leads to the inside of the boiler.
ALL the manu's know this could happen but they are stuck between a rock as the condensate (acidic) must run back to drain.
BTW non condensing FF boiler flues sloped away from the boiler to stop this happening and on older balanced flues, it just happened anyway although nobody noticed for a good few years until it started rotting.

 

[stevetheplumber]

i can see this being a major problem in future as rain water entering through the air inlet has nowhere to run to probably going to need redesign to allow water to enter the condensate pipe work via some kind of seal
in theory this water could be drawn into the fan

 

[jontris]

Thanks again respondents.

So ... the answer is that rain water CAN get back into the boiler. On the gas side it goes back into the condenser and isn't a problem. On the air side it has nowhere to go but down. My installer laughed at me when I suggested this might be happening.

My flue is high up and exposed, so I may be more prone to the problem than most. I suppose one solution would be to build a cover to protect it from the rain.

 

[rob jefkins]

Just had to replace a fan on potterton 70HE because rain water had come in through the flue and blew the fan motor. Obviously a common fault here.

 

[sparky]

A stab in dark but could the inner flue pipe have been cut accidently when cutting flue down? Have seen this before with water coming into boiler.Havent read all posts so apolagise if this has already been mentioned.

 

[Unregistered]

switch boiler off,get gassafe engineer to have a look.your discrpition of fault is to vague,why do you need de humidifyer.the flues are designed to fall back to allow condesate water produced, to run throu boiler and out vai con pipe

this is the boiler i have and i am having the same problem

 

[Dotty]

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