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. R

    Condensing mode

    I have read that condensing boilers operate more efficiently if the return temperature is kept below 55degC to enable the boiler to run in condensing mode. Assuming that's correct, how is this achieved? Do the boilers monitor the return temperature and adjust output accordingly, or Is it the...
  2. W

    Oil condensing boiler- Burner Lockout Problem

    Hi gents, ive had a problem for sometime now with an oil condensing boiler suffering from "burner lockout" I' ve just had the boiler serviced, cleaned and checked out and took the precautions to replace some of the suspect parts. Oil filter was replaced burner nozzle was replaced Solenoid was...
    • Widdzy
    • Thread
    • boiler burner condensing condensing boiler lockout oil problem replaced
    • Replies: 1
    • Forum: Plumbing Jobs | The Job-board
  3. M

    Cheapest & Best 25KW Combi condensing Boiler

    I will have to replace and old Worcester 24i boiler that is about 13 years old. I have been looking on line for some similar spec boilers and would like to know anyone have any suggestions. There is Worcester for about £900 but it seems very expensive. Any Ideas Thanks in Advance for...
  4. R

    Condensing bolier flow and return temps - effect on rad sizing?

    Had a quote for complete new CH system including Worcester Greenstar 28i Junior. Not sure I totally understand this, hence asking here: I was pretty surprised at how small the rads spec'd were as I thought condensing boilers needed as low a return temp as possible? The installer (WB...
  5. M

    boiler servicing

    Hi every one What checks do you guys do when boiler servicing ? I m 99% I cover it all just want to check Check boiler works Tightness test Visual inspection Fga Clean spark electrodes and condense Scrub heat exchanger Standing pressure Burner pressure Fga Tightness And also whats...
  6. M

    potterton performer non condensing continuously running

    Now, I believe it's the pcb as no matter what you do, the pump runs continuously and down heating. Apart from when isolated. So I can't turn it just to hot water on dash board to turn it off. I cannot turn it of with a mechanical timer which is switching but no joy.
  7. Hobo128

    Gross and Net. Latent heat? Head scratcher

    Hi, Was having a read the other night and "the penny dropped" Not sure if I'm right though. Example: If I gas rate an appliance say an old combi boiler I get a gas rate in Gross which I then have to convert to Net because of latent heat (Something like 11% of heat is lost in flue gases) My...
  8. M

    8m long boiler flue in void with no room for slope back

    I am trying to replace an existing non condensing boiler which has an 8m long truly horizontal flue which runs in a 90mm tall ceiling void. The Installer proposal is to use a Keston System 30 condensing boiler with dual 50mm plastic flues with only 2 joints since they come in 4m lengths. This...
  9. S

    Unusual Boiler Suggestions

    Evening all, Any suggestions for a gas CH boiler that's not a white box? It's for a listed building, needs 120,000+ btu (big old farmhouse). CO is driving me nuts with his restrictions on flue outlets... there's an unused inglenook fireplace so one possible solution was to combine with a range...
  10. B

    Worcester 28i junior, non condensing - is it the pcb?

    Hi guys, went to one of these boilers today. Everything working as normal but no gas coming through gas valve. Tested the voltage on the power leads to it and was getting 47v. Sure I should be getting 230v. Checked the resistance on the valve too, anyone know what the resistance should be? if...
  11. B

    Back boiler to condensing boiler swap

    I live in Edinburgh and have received a quote for swapping my old back boiler, 23 years old with a new condensing combi boiler, as I know the Baxi Bermuda I have is really inefficient, and my gas bill is £100/month! Also Scottish Gas are refusing to cover it. I'm guessing it's too much risk for...
  12. T

    Large Oil Boiler Brand?

    Hi, I require a new oil boiler. Currently heating does not do attic however I would like boilers to be able to cope in future. For this reason I think it may be better to get 1 boiler now and have plumbing for another at a later date? How much more efficient would heating be with 2 boilers...
  13. Hobo128

    Fitting a Keston twin flue condensing boiler

    Hi has anyone dealt the Keston combi 30 (twin flue system). I went to see a job earlier and there is already a Keston system boiler in with this strange twin flue system in.(Which by the way is made out of 50mm solvent weld waste pipe. The propery is a 30-40 unit block of apartments. In the...
  14. T

    intermittent lockout 24 I junior ( non condensing)

    I have a Worcester 24junior, (early one not the greenstar) intermittent lockout, suspect ignition lockout, but cannot repeat fault when on site, all works lovely after reset. Frustrating!!! Fan replaced last year (seized) Inlet 23Mbar standing 21mbar working Bp12mbar Spark...
  15. P

    Alterations for a twin wall oil fired fue

    Hi all Being a "townie" I am GSR but never really have anything to do with oil. Looked at a job for a builder before Xmas which is a 2nd storey extension, so my involvement is extra rads, move and add a cylinder, and fit a bth/shower room. There's an oil fired boiler there with a twin wall...
  16. G

    Condensing boiler using alot of oil.

    Hi Folks, I just wanted to ask about the oil consumption of my condensing boiler. It is a Worcester boiler which was installed and commissioned 2.5 years ago. The boiler achieved an efficiency back then of 98%. I have been keeping a close eye on my oil use recently and feel that it is excessive...
  17. Hobo128

    Installation of a condensing boiler and 7 rads????

    I know it doesn't really work like this without seeing the job but give me a price for fitting a condensing boiler and 7 rads re piping the whole lot, you can use hep for most of it, the ground floor 3 rads are on drops and are being chased into the walls( not down for plastering) the existing...
    • Hobo128
    • Thread
    • about boiler cheap cold radiator condensing condensing boiler hot rads installation interested labour oil you're
    • Replies: 25
    • Forum: Plumbing Jobs | The Job-board
  18. Scott_D

    Potterton powermax condensing?

    Quoting to replace one of these with a wall hung combi (the want a WB 34cdi) I think the cupboard was built around the boiler so no room to look at anything around the back. Are they all condensing? looking at the MI's they are but didnt want to get caught out as its in the middle of the...
  19. S

    baxi condensing system boiler

    just had a text of boiler error 125 primary circuit and burner light been on only occasionally any one had this
  20. B

    Cowl for a non condensing

    Custard has asked me to use the following on his conventional flue for an old non condensor. Any reason why it shouldnt be ok? Thanks

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