Central Heating Boiler Flue Dripping Water
- Thread starter merchant_banker
- Start date
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Cheers, so is this bad then?
Ho hum....
If it's a CONDENSING boiler, water in the flue is ENTIRELY NORMAL. The flue should slope back towards the boiler and any joints in the flue should be designed and installed so that nothing leaks out. If it leaks, it's probably an installation problem.
If it's a CONVENTIONAL boiler, there WILL be condensation in the flue when it starts from cold (because the internal surface of the flue will be below 'dew point'). The flue should slope continuously DOWNWARDS away from the boiler, so if there is some condensation it will drip out of the end. If this is impossible (eg. a vertical flue) the boiler spec will take this into account when stating the max length, etc. Conventional boiler flues are usually NOT watertight, so if there's a sag in the middle, the joint WILL drip when the flue is cold. If the flue slopes down then up again, this is DANGEROUS because accumulated water could block it. Even a slight sag is bad practice.
If it's a CONDENSING boiler, water in the flue is ENTIRELY NORMAL. The flue should slope back towards the boiler and any joints in the flue should be designed and installed so that nothing leaks out. If it leaks, it's probably an installation problem.
If it's a CONVENTIONAL boiler, there WILL be condensation in the flue when it starts from cold (because the internal surface of the flue will be below 'dew point'). The flue should slope continuously DOWNWARDS away from the boiler, so if there is some condensation it will drip out of the end. If this is impossible (eg. a vertical flue) the boiler spec will take this into account when stating the max length, etc. Conventional boiler flues are usually NOT watertight, so if there's a sag in the middle, the joint WILL drip when the flue is cold. If the flue slopes down then up again, this is DANGEROUS because accumulated water could block it. Even a slight sag is bad practice.
Its condensing type and drips from the end of the pipe that sticks out.
Not much one big drip every now and again depending how hight we've got it set.
Not much one big drip every now and again depending how hight we've got it set.
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At risk of repeating myself...
If it's a condenser and dripping out of the end, it's (obviously) sloping the wrong way.
If it's a condenser and dripping out of the end, it's (obviously) sloping the wrong way.
Not necessarily!
He has already said it depends on how high he has it set.
Many boilers, even if the flue slope is correct will "blow" a few drips out of the terminal.
I saw a new one a few days ago doing this. In that case I was able to do a little minor surgery with a hacksaw blade to reduce the build up of condensate at the remote end. It solved the problem in that instance.
Did you hear the brain surgeon on R4 today about the man with a nail fired from a nail gun into his skull? Had a barbed nail too! He walked into the hospital! She cut around the nail, removed the nail/bone, filed off the barbs and hammered the nail in the reverse direction and then refitted the bit of bone and sewed it up. He walked home three hours later.
Tony
He has already said it depends on how high he has it set.
Many boilers, even if the flue slope is correct will "blow" a few drips out of the terminal.
I saw a new one a few days ago doing this. In that case I was able to do a little minor surgery with a hacksaw blade to reduce the build up of condensate at the remote end. It solved the problem in that instance.
Did you hear the brain surgeon on R4 today about the man with a nail fired from a nail gun into his skull? Had a barbed nail too! He walked into the hospital! She cut around the nail, removed the nail/bone, filed off the barbs and hammered the nail in the reverse direction and then refitted the bit of bone and sewed it up. He walked home three hours later.
Tony
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