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condensing

Condensing boilers are water heaters fueled by gas or oil. They achieve high efficiency (typically greater than 90% on the higher heating value) by condensing water vapour in the exhaust gases and so recovering its latent heat of vaporisation, which would otherwise have been wasted. This condensed vapour leaves the system in liquid form, via a drain. In many countries, the use of condensing boilers is compulsory or encouraged with financial incentives.

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  1. D

    Can I get a flue diverter for a non condensing oil fired boiler ?

    Hi I have moved into a older semi bungalow it contains a Boulter 50/70 non condensing oil fired boiler the flue is illegal as far as I know being about 6" from the semi next door anfor about 6 " from ground level. Not only that the neighbours next door complained in the past about the smell so...
    • Deleted member 113202
    • Thread
    • america boiler condensing diverter fired flue oil usa
    • Replies: 5
    • Forum: USA
  2. A

    warmflow B70 HE not condensing.......

    hi fellas - installed a warmflow B70 HE yesterday but cannot get it into condensing mode - going back tomorrow and will possibly downsize the nozzle and oil pump pressure and circulation pump speed - any other suggestions?
    • apcdave
    • Thread
    • america condensing usa warmflow
    • Replies: 5
    • Forum: USA
  3. M

    SS twin-wall flue with condensing oil boiler

    Hi Forum, I am about to start the process of removing a wood pellet boiler and replacing it with a Grant Vortex Eco 15-21kW Utility condensing oil boiler. Flue currently in use is Staovax XQ Stainles twin-wall system, Stovax's manual states "For use with both commercial and domestic high...
  4. davidw

    Greenstar Condensing Boiler 24 Ri big enough for job?

    We've just moved into a house with the Greenstar condensing boiler. It seems to be struggling a little in that if you're running a bath and someone puts the dishwasher on then it's as if it can't cope. We've come from a combi Boiler and this seems a little ropey in comparison. Maybe I'm...
  5. M

    worchester bosch 34cdi

    Hi I have a Worchester bosch 34cdi 3 years old recently started to loss pressure associated with water running from the condensing pipe every 15 minuets I/2 a tea cup and i know this because it had a lift pump which i noticed was pumping all the time removed the pump placed a bucked under pipe...
    • miked
    • Thread
    • america bosch condensing pipe pressure usa water worchester
    • Replies: 10
    • Forum: USA
  6. M

    condensing flue through cellar roof to above-ground ?

    Hi all, can anyone advise if it's possible to route a flue from a condensing boiler in an underground room up through the ceiling (15" thick) where it will come out above ground on a flat surface ? And from there it will extend up the side of the house, as in this picture ?
  7. A

    Grant euroflame condensing oil boiler losing pressure

    Hi all, Hope you might be able to help. Last year I installed a new boiler as per title. Since then the pressure is always very low to none and I have to constantly top it up. The system was fed from a tank in the attic and had very low pressure, at best 0.4. I had it swapped it to be fed...
  8. B

    GREENSTAR 25i GAS CONDENSING BOILER

    Just had the above boiler fitted, and my gas fitter has just gone away on holiday. I,ve noticed that the pump ( i assume) seems to keep operating every so often even though i,ve turn the CH down to minimum and all the TRV,s off. I,m awaiting an MT10 programmer as the one i had was no good , but...
  9. J

    Grant Vortex Condensing Boiler air in fuel?

    hi I have a grant oil fired boiler that is approx 4 years old. Recently the burner has started locking out. If I press the reset button it will start and fire and heat enough water for a shower etc... but then locks out. Sometimes it will stay on for a couple of days and give hot water on demand...
  10. C

    Condensing Boiler - switching off

    I need to regenerate my megaflo - my wife reports occassional dripping in the tun dish. Our boiler is in the garage and it operating on frost protection most of the time at the moment. Usually, the system closes down by turning off the boiler and then the pump (I assume to make sure that hot...
  11. H

    Condensing mode when does it happen

    Hi all , I live in new build house with condensing boiler and unvented cylinder , what I would like to know is if my boiler is ever in condensing mode and how I could find out. I have read that the return needs to be around 55 degrees c to reach dew point which I guess is when the residual...
  12. sammathias

    Worcester 24i junior non condensing breakdown

    Called to a breakdown. Basically boiler locksout and flashes 4 times a second. Fans working getting 240, pumps getting 240, working but not really strong. Boiler lights and runs for a minute or so then I noticed the fan cuts out and burner flames come from under burner. Flues clear and cleaned...
  13. T

    Firebird Condensing Boiler

    Firstly I don't install boilers, I'm not a plumber, I commission, service and repair, hopefully anyway. Was called out to a Firebird Enviromax Condensing Boiler after it had sooted up. Boiler is about 3 or 4 years old. Cleaned it out, changed nozzle, checked oil pressure. Still burning black...
  14. M

    Drain hose - integrated washing machine / condensing dryer

    Hi Would like to extend this hose to a total of 3.2m (which is ok in the manual) Can I route the hose down to floor level (so as to go underneath the oven and cabinets etc) before then coming back up to connect in to the sink? Or is that not allowed / would cause problems? Thanks! :)
  15. gpbeck

    Dodgy Bypass Preventing Condensing

    I am always surprised that Boilers don't display return temperatures. I manually adjust flow temps to achieve a return of about 53 as a form of weather compensation. Last time the best flow temp was 62 with return 54 and as you can see my solid walled home couldn't get there. A hand on the...
  16. M

    Condensing Boiler Flue Discharge

    I have recently had a Worcester Bosch 30Si boiler installed and it works a treat. However I have noticed that when it is fired up, in addition to the plume there is a steady drip of water that comes from the flue (externally not internally). Is this normal because I thought all the condensed...
  17. J

    Weather Compensator - Greenstar CDi condensing boiler

    Hi, I have a Worcester 30 CDi boiler running on natural gas and would like to know if a weather compensator can be retro-fitted to the boiler. I have contacted Worcester Bosch and the technical guys there say that they do not have anything that will be able to assist in this problem and would...
  18. Rob Foster

    Condensing Boilers - what volume of codensate is discharged

    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
  19. D

    Condensing boiler problems

    Hi, please can you help me solve this. My condensing boiler (Glow worm Betacom 3 - 30c ) leaks what I think is condensate as it's not clean water. I think I'm not using my boiler enough?? I live alone and work away so the boiler doesn't get used much. It only happens in summer when the...
  20. Bogart

    Condensing boiler trap

    Now I always thought that a condensing boiler needed a condensate trap. Was at the back of mine just now and cannot see any trap. There is a 22mm plastic pipe from an outlet marked "condensing outlet" which goes off into a soakaway. It is a Grant Vortex Utility about 10 yrs old.
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