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Discuss Condensing Boilers - what volume of codensate is discharged in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. Rob Foster

    Rob Foster Top Contributor!!

    When a 25 kw condensing boiler is going full tilt in the winter what volume of condensate water might be discharged per hour ? Obviously an overflow pipe will cope. Anybody any ideas. It could be 20KW or 30 KW I am looking for a ball park volume. Many thanks
     
  2. scott_d

    scott_d Plumber GSR

    What's the reason you need to know?
    I don't think many boiler are condensing 100% of the time
     
  3. Rob Foster

    Rob Foster Top Contributor!!

    customer asked my mate, he didnt know and asked me ,neither did I so I asked you !
     
  4. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Would say under a litre an hour
     
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  5. scott_d

    scott_d Plumber GSR

    I think sone boiler have an amount listed in the manual
     
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  6. fixitflav

    fixitflav Active Member

    For 25kW output, I make it theoretical water production about 2.4 litre/h , but not all of that will condense.
     
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  7. Rob Foster

    Rob Foster Top Contributor!!

    Hi fixitflav thanks for that - how did you calculate it may I ask - in awe of you on this one
     
  8. rpm

    rpm Trusted Plumber

    Rob, when you had 20 fitters working for you what sort of work were you doing?
     
    • Funny Funny x 2
  9. Rob Foster

    Rob Foster Top Contributor!!

    Types of work ..1 Contract ch installation new build, 2 medi-gas contracting, 3 local plumbing/domestic ch installs but in a quite tight area - no adverts just word of mouth so we knew the customer and they us. 1st 2 profit is all down to margins and speed 3 is down to reputation word of mouth. Beware you have to get from one man (you) to over 5/6 very quickly or you end up not earning anything yourself Young men for 1, steady fellas for 3 and anybody who was prepared to work xmas easter and bank holiday for 2
     
  10. fixitflav

    fixitflav Active Member

    Originally I used a hand calculator and seem to have dropped a cod, it's actually more like 3.8 l/h.
    Calculation below. I used Mathcad, but pleasantly surprised it copied in OK. Don't worry about apparent lack of conversion factors etc, Mathcad takes care of that for you. I've made one or 2 assumptions, as natural gas is not pure methane, but it won't be far out for water produced. Be interesting to compare with maker's figure, to get an idea about what fraction condenses. Come back if you need more.

    upload_2018-8-7_19-17-40.png
     
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  11. Rob Foster

    Rob Foster Top Contributor!!

    thank you gobsmacked - o_O
     
  12. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    2.347m3/hr not 2.429

    also that figure is a constant 25kw on a heat/system boiler which even at the middle of winter wont run constantly on full

    if its a combi that figure will be lower also due to the output
     
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  13. fixitflav

    fixitflav Active Member

    Depends on the makeup of the gas and the assumed boiler efficiency, but either is near enough in practice.
    OP said "when the boiler is going full tilt".
     
  14. sammathias

    sammathias Plumber GSR

    Honestly I think I've read closer to 3l/h somewhere. Maybe a vaillant manual.
     
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  15. sammathias

    sammathias Plumber GSR

    28kw vaillant 1.9l/h...
    30kw vaillant 2.5l/h
    God I'm sad.
     
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