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  • FIRST POST
    Ravawhitby
    New Condensing Boiler = Flue dripping external water?
    • #1
    • 4th Mar 10, 10:17 PM
    New Condensing Boiler = Flue dripping external water? 4th Mar 10 at 10:17 PM
    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
Page 1
    • adonis
    • By adonis 4th Mar 10, 10:27 PM
    • 597 Posts
    • 502 Thanks
    adonis
    • #2
    • 4th Mar 10, 10:27 PM
    • #2
    • 4th Mar 10, 10:27 PM
    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.
    • CharlieBilly
    • By CharlieBilly 4th Mar 10, 10:39 PM
    • 1,442 Posts
    • 1,270 Thanks
    CharlieBilly
    • #3
    • 4th Mar 10, 10:39 PM
    • #3
    • 4th Mar 10, 10:39 PM
    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
  • ormus
    • #4
    • 4th Mar 10, 11:53 PM
    • #4
    • 4th Mar 10, 11:53 PM
    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.
    • olly300
    • By olly300 4th Mar 10, 11:55 PM
    • 14,315 Posts
    • 13,632 Thanks
    olly300
    • #5
    • 4th Mar 10, 11:55 PM
    • #5
    • 4th Mar 10, 11:55 PM
    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.
    Originally posted by adonis
    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.
    I'm not cynical I'm realistic

    (If a link I give opens pop ups I won't know I don't use windows)
    • keystone
    • By keystone 5th Mar 10, 12:07 AM
    • 10,783 Posts
    • 5,874 Thanks
    keystone
    • #6
    • 5th Mar 10, 12:07 AM
    • #6
    • 5th Mar 10, 12:07 AM
    Mine doesn't.
    Originally posted by olly300
    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
    • david29dpo
    • By david29dpo 5th Mar 10, 8:08 AM
    • 3,666 Posts
    • 1,387 Thanks
    david29dpo
    • #7
    • 5th Mar 10, 8:08 AM
    • #7
    • 5th Mar 10, 8:08 AM
    I always thought the flue had to be at a slight angle so the condensate drained back in to the boiler?
  • gas4you
    • #8
    • 5th Mar 10, 8:34 AM
    • #8
    • 5th Mar 10, 8:34 AM
    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.
  • Ravawhitby
    • #9
    • 5th Mar 10, 11:46 AM
    • #9
    • 5th Mar 10, 11:46 AM
    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
    Originally posted by keystone
    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.
  • Ravawhitby
    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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