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Discuss Vaillant eco TECH plus 835 in the Gas Safe Register Forum - Public Forum area at UKPlumbersForums.co.uk.

  1. Windy

    Windy New Member

    writing up my last report for my gas portfolio and have come up against something i can't work out whilst doing the gas rate figures!!
    Data plate shows Hot water pnw 34kw and qnw 34.7kw (hi)
    manual shows gas rate norm level 3.78m3/h minimum 3.4m3/h maximum 3.97m3/h
    If i fudge a gas rate level to 3.78m3/h that is equivelant to 40.67kw gross which is 36.64nett.
    They don't match up? are the data plate figures nett?
    I even called valiant, they were useless...
    Reason i am asking is that I don't want to mess up my portfolio by making a mistake! my gas rate came out at 3.42m3/h which is too close in my opinion to the MI docs minimum allowance..
    Any ideas?
  2. scott_d

    scott_d Plumber GSR Top Contributor!!

    How did you gas rate it?
    Did you try twice?
  3. Windy

    Windy New Member

    yeah, tried a few times, had it running at full..

    more concerned about the valiant figures, really
  4. Stu-B

    Stu-B Active Member

    What was the inlet pressure at the boiler?

    What did Vaillant say when you spoke to them?
  5. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    I would be happy with that gas rate you will never get it perfect that’s why they allow you a % up or down
    • Like Like x 1
  6. Windy

    Windy New Member

    Vaillant weren't of much use, only asked CO2 levels from a safety point of view... He said i could email them but they will take ages to reply.. LOL. I just wanted to try and understand the levels in MI's against data plate on the boiler....
    Inlet pressure was ok 19.5mb
  7. Windy

    Windy New Member

    just to be clear, my issue isn't really with my personal gas rate obtained. Its with Vaillants quoted figures!
    Ive attached the data plate.... and as stated the norm gas rate is 3.78m3/h +5% -10%
    what would you say the max input is from the data plate and is that a nett figure?

  8. scott_d

    scott_d Plumber GSR Top Contributor!!

    We’re you testing by running a hot tap?
  9. Windy

    Windy New Member

    Yes I was...
  10. EvilDrPorkChop

    EvilDrPorkChop GSR

    I'm not sure what the issue is? You've gas rated it and it's within the MI range. If the MI allows you that range then it's correct. TBH i've never had a Vaillant over read that much anyway, they're usually slightly under the nom.
  11. scott_d

    scott_d Plumber GSR Top Contributor!!

    Use the test programs
    • Agree Agree x 2
  12. sammathias

    sammathias Plumber GSR

    Installer level, codes in the book. Then p.01 with tap on full. After 10 minutes start p.01 again then take gas rate.
  13. Harvest Fields

    Harvest Fields S. Mod Trusted Plumber GSR Top Contributor!!

    You cannot test it like that.
  14. scott_d

    scott_d Plumber GSR Top Contributor!!

    We’re you helping someone install?
  15. Windy

    Windy New Member

    Install was with official Vaillant installer... Gas rate obtained by putting boiler into installer modes and running hot water!!
    my point as stated....
    vaillant instructions show 3.78m3/h as norm with tolerance of +5%/-10%
    boiler data plate (as shown in picture) shows max heat input pnw 34kw and qnw 34.7kw.
    gas rate is a formula... if i work out a gas rate of 3.78m3/h gross this gives you a kw level of 40.67 gross or 36.64nett NOW.. if you look at data plate. that means that the norm expected for this boiler is 34kw or 34.7kw (data plate)
    the point i am making is, i don't think the vaillant figures can tally up correctly...
    I know my gas rate obtained is within guidelines, i just don't get the manufacturers levels...
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