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New Condensing Boiler = Flue dripping external water?
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# 1
Ravawhitby
Old 04-03-2010, 10:17 PM
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Question New Condensing Boiler = Flue dripping external water?

Hi,

I have recently (last week) had a new condensing combi boiler installed (Glow Worm Flexicom 35HX). I have noticed that when its in use there is always a patch of water outside on the block-paved driveway underneath the flue. Am i right in thinking this should not be the case and that this should be coming back into the boiler and into the condensing drain ? This was ordered direct with Glow Worm and fitted by one of their sub-contracting firms. Today we had a visit from a Glow Worm Service Engineer to 'commission' the boiler and check installation was ok. When it was mentioned to him he said it was 'normal'. I've looked at the flue and it appears to be very slightly tilted back so not sure why there is this patch???

Any thoughts/suggestions would be most appreciated, - I'm thinking of contacting them again but feel like they've already decided all is ok.

Thanks
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# 2
adonis
Old 04-03-2010, 10:27 PM
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I thought condensing boilers had to have a pipe outside going into a drain or soakaway as the discharge was slightly acidic.
Someone else may be able to confirm this.
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# 3
CharlieBilly
Old 04-03-2010, 10:39 PM
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Thats normal I think there has been issues when water hasn't escaped recently in some installation as the pipe didn't slop enough and water would then freeze
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# 4
ormus
Old 04-03-2010, 11:53 PM
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how do you know it is condensate from the boiler?
it maybe just water vapour in the atmosphere, thats been condensed from the normal hot flue steam/gases.
Get some gorm.
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# 5
olly300
Old 04-03-2010, 11:55 PM
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Quote:
Originally Posted by adonis View Post
I thought condensing boilers had to have a pipe outside going into a drain or soakaway as the discharge was slightly acidic.
Someone else may be able to confirm this.
Mine doesn't.

Edited to say: I've had two different plumbers work on it over the years. One does a gas check every year which I have to do as the requirements of my lease.
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# 6
keystone
Old 05-03-2010, 12:07 AM
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Quote:
Originally Posted by olly300 View Post
Mine doesn't.
It may not but any condensing boiler will have a condensate drain so you'll have one if you can't see it because its prolly connected to your internal waste pipework somewhere. A condensing boiler typically produces 4 litres a day - it has to go somewhere.

Cheers
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# 7
david29dpo
Old 05-03-2010, 8:08 AM
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I always thought the flue had to be at a slight angle so the condensate drained back in to the boiler?
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# 8
gas4you
Old 05-03-2010, 8:34 AM
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The flue on a condensing boiler should, in a perfect world, slope back towards the boiler at 3 degrees.

You may still get a very slight discharge of condensate when the boiler fires up as the fan may 'blow out' any residual condensate drops that my be laying in the flue.

Boilers can produce around 2 litre/hr if in full condensing mode.
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# 9
Ravawhitby
Old 05-03-2010, 11:46 AM
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Quote:
Originally Posted by keystone View Post
It may not but any condensing boiler will have a condensate drain so you'll have one if you can't see it because its prolly connected to your internal waste pipework somewhere. A condensing boiler typically produces 4 litres a day - it has to go somewhere.

Cheers
Yep, I removed part of the kitchen so they could run the condensate pipwerork internally to the waste pipe rather than on the exterior into the main soil pipe.
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# 10
Ravawhitby
Old 09-03-2010, 6:49 PM
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I was just outside taking some photos to send to Glow Worm as it looked particularly bad when I came home tonight.......other half was inside and not aware of what I was doing and turned on one of the taps......this resulted in a gush of HOT water coming out of the flue, down the wall and onto the driveway. I'm sure this can't be right. Its sited to the left of the front door and I'm sure if a visitor was to be 'splashed' they'd not be happy ? Think I'll ring Glow Worm tomorrow......
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