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Discuss Combi boiler installation in the Gas Safe Register Forum - Public Forum area at UKPlumbersForums.co.uk.

  1. Sonia Muss

    Sonia Muss New Member

    We've just had a new combi boiler installed by a corgi registered engineer and there's a join with 2 different size pipes as picture. We were told by other engineered when getting quotes that the smaller pipe needed to be replaced. Can someone please clarify if this difference in pipes size is correct and we are safe?
    And also, 2nd picture, is it safe to have this pipe separated from the wall dip much? It will be enclosed in a cabinet, but even so, I was planning on storing something there.
    Many thanks
    Sonia

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    15082463059251555687937.jpg
     
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Your other engineer is correct to a certain extent, and I would never done it like in the pics never like it

    But if it's got enough pressure and it's using enough gas it's fine

    Any chance you could take a pic of the benchmark (in the back of the installer instructions)
     
  3. Scott_1979

    Scott_1979 GSR

    What type of boiler make is it? I know the logics only need a 15mm gas run. I'm assuming it was gas rated and had all the pressures taken when it was commissioned.

    Pipework isn't great but depends what was on the quote to start with, sometimes I would like to repipe everything in properties but you can only do so much.
     
  4. Vee

    Vee Plumber GSR

    How far is the gas meter from the location pictured. What kilowattage is the combi. Do you have any other gas appliances? Gas Safe Register give free second opinions....
     
  5. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Can I please ask why you are questioning this now and not before the work had been completed?
     
  6. Vee

    Vee Plumber GSR

    My bet is on the cheapest quote.
     
  7. jtsplumbing

    jtsplumbing Plumber GSR

    Take it the copper pipe is gas ?? looking at the photo showing the copper pipe the fitting looks like its not been soldered , when was this done ? as the copper pipe looks older than the condense pipe, was this existing pipe work ?
     
  8. Meady

    Meady Plumber GSR

    All looks soldered to me, but isn’t that a condense pipe going into a copper pipe? If so I didn’t think you were allowed to do that.
     
  9. Chalked

    Chalked Plumber GSR

    That's a condensate, going into a copper waste!! It will be rotten in weeks. That need sorting immediately.
    As for the gas it depends how far away your gas meter is and the size ( kw) of your boiler. 15mm copper will only work correctly, if the meter is no more the a couple of metres away.
     
    • Like Like x 1
  10. Chalked

    Chalked Plumber GSR

    Hi how do you work out that a logic can work off 15mm??
    It depends on meter position.
     
  11. Scott_1979

    Scott_1979 GSR

    Just answered your own question
     
  12. scott_d

    scott_d Plumber GSR

    More pictures needed
     
  13. Colin0368

    Colin0368 New Member

    Condensate looks incorrect if connected to copper but looks a bit like old discoloured 1 1/ 4 pipe .. gas pipe fine providing working pressure holds up on max with other appliances running at time of testing .. there can be 2 issues here .. 1) scruffy looking connections making you think it's wrong 2) scruffy looking connections making you think it's wrong but it's safe and will hold up under testing.
     
  14. jtsplumbing

    jtsplumbing Plumber GSR

    Was looking at the photo of the 22mm elbow , not the 22/15 reducer
     
    • Agree Agree x 1
  15. kezz_123

    kezz_123 plumber

    Must of run out of talon clips ;)
     
  16. Moffski72

    Moffski72 Moffski72 GSR

    Benchmark??:D:D:D
     
  17. Sonia Muss

    Sonia Muss New Member

    Hi guys,
    the boiler is a Worcester Bosch 30i.
    The boiler is at least 5 or 6m from the gas meter.
    Here are more pictures.
    I am along the question now because I didn't know what he was going to do and assume he would change the small pipe just as everyone one else had said. He is a corgi registered engineer Sonia I thought he would do the same as every one else. I gutted after so many quotes I didn't go into detail of work and wad thrilled when he said he could do it at the end of the week.
    Thanks for all your replies. I hope these pictures make it clearer and you can all come to a deviation of whether it is safe and it will work correctly.
    Kind regards
    Sonia

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    • Disagree Disagree x 1
  18. Sonia Muss

    Sonia Muss New Member

    Hi guys, forgot to say that the narrow pipe was the pipe connected to the old boiler which was on the floor and don't remember the make because the engineer took it but sounded like Thompson or something with o's in the name.
    Thanks again
     
  19. Sonia Muss

    Sonia Muss New Member

    And only the water and central heating is gas, the cooker is electric, just answering another one of your questions
     
  20. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    I would say at an estimate it's not right and needs upping (gas pipe)
     
    • Agree Agree x 1
  21. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    The gas pipe to a Worcester should be 22mm for at least the whole length.
     
  22. Sparkgap

    Sparkgap Active Member

    In an ideal world there'd be 22mm all the way. You can get away with 15mm for about 7-8m for that boiler size. I assume the installer did a pressure drop test and any drop was within acceptable limits.
    All those burn marks on the wall tho', didn't he hear of solder mats?
     
  23. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    The boiler is made to connect a 22mm gas pipe. Which means in my eyes it should all be 22mm otherwise it is undersized. Your comments may stand on an old install but not a brand new one. It should have been upgraded.
     
  24. scott_d

    scott_d Plumber GSR

    How much did this cost out if interest?
     
  25. SlimD

    SlimD GSR

    That waste pipe could be an old terrain pipe with crap on it. Just the photo making the colour look off so it gives the impression it's copper. But if it IS copper then WTF?!
    Looks like he's just stuck 22mm on the old existing 15mm for the last stretch. I'd have been inclined to replace whole gas pipe with 22mm if at all practical.
    Whilst no one is perfect it's not best pipework with burn marks on walls which is sloppy. I've taken to polishing up my pipework afterwards with Brasso. Only takes a minute and leaves a good impression if pipes are gleaming when jobs finished.
    If this was a cheap quote then I'm afraid you get what you pay for.
     
    • Like Like x 1
  26. Chalked

    Chalked Plumber GSR

    Good spot. That could be old brown waste pipe.
     
    • Like Like x 1
  27. jtsplumbing

    jtsplumbing Plumber GSR

    Dark grey waste Proberly Key-Terrain or Hunter, is the small gas pipe accessible on the other side of the wall ? Pipe work is something of a mess, but at the end of the day its down to what you have paid, can't expect top quality work for low cost price, but get the gas re-checked not much you can do about the rest
     
  28. oz-plumber

    oz-plumber Plumber

    In fairness to the owner and the installer...

    When you quote for a boiler replacement, how much do you consider to replace existing pipework.
    From the pics, where do you start and where do you finish?
    You are dealing with an old system with pre-existing pipe work.

    Fair enough, the gas line looks undersized, but..can we judge?
    Might be OK - some pertain to this, no proof of testing of appliance.
    Condensate - to me and my experience, the fittings on the pipe don't look like copper fittings, so from pics, should assume not copper pipe.

    It's a dilemma we all face. How much of the pipework do we upgrade, re-assemble when changing a boiler, considering all the unseen pipework will be done to the standard of the visible pipework or worse.

    The Plumber has installed a Magna Clean filter, that shows something.
    From my depiction of the pics- gas line pipe sizing ?, the rest of the install he has made the best out of a previously installed boiler, without going over the top on replacing existing visible pipe work/

    As for the cheapest quote scenario, it is the customers choice of whom they choose.
    As for the plumber, I think he has done a neat enough job for the situation he was presented with.
    He may have done the minimal required, but that's his judgment on how much t replace.
     
    • Dislike Dislike x 1
  29. scott_d

    scott_d Plumber GSR

    I agree with the 'how far do you go' but this guy must have turned up with 2 pipe clips and no level.
    He hasn't scrimped on the filter, boiler and lime fighter but took no pride in the work. Maybe as it was done on the cheap, maybe not.
     
    • Like Like x 1
    • Agree Agree x 1
  30. spanner

    spanner Plumber GSR

    I'm assuming the 15mm pipe is coming from the meter and the pipe to the biliiler is a 22mm connector??
     
  31. Sonia Muss

    Sonia Muss New Member

    Thanks, the engineer said the pressure drop is within limits, 21 I think he said, the pipe to the gas meter is a straight line of maybe 4 or 5m, and we only have the hot water and central heating running on gas, so he said it should be ok, which matches your answer. It all works fine so far so I guess it's ok. Thanks
    I didn't know about solder mats but he should have known! Anyway it will be enclosed in a cupboard and I'll try to paint over it. Thanks for your answer
     
  32. Sonia Muss

    Sonia Muss New Member

    Hi guys, thank you all for your replies. The job is done and works. I just wanted to know it was safe. The 15mm pipe goes under ground and I think he should have cut it and replace with one parallel to the wall, but he should Have had to cut on a straight line through 2 walls. I guess he didn't want the extra work! Tune main thing is that the 15mm pipe is safe considering the state it is in, all rusty and dirty. I'll clean it with Brasso, as per of you suggested, and see how it looks.
    Job done by British Gas engineer, so not cheap
     
  33. jtsplumbing

    jtsplumbing Plumber GSR

    You say done by a BG engineer ! was it done by BG or some one that works for them as a private job, For a BG guy this is a poor standard of work ! Did you know that if he is employed by BG that he is not coverd by gas safe out side of working hrs, but loads of their guys do jobs on the side, for cash,
     
    • Like Like x 1
  34. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Hope he didn't do it on the side as he's not qualified out of work time :D
     
  35. spanner

    spanner Plumber GSR

    That's the BG umbrella
     
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