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Discuss Vaillant eco TECH plus 835 in the Gas Engineers Forum area at PlumbersForums.net

Hi,
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?
 
OP
Windy
yeah, tried a few times, had it running at full..

more concerned about the valiant figures, really
 

Stu-B

Advent Win
What was the inlet pressure at the boiler?

What did Vaillant say when you spoke to them?
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
I would be happy with that gas rate you will never get it perfect that’s why they allow you a % up or down
 
OP
Windy
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
 
OP
Windy
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?

IMG_5844.jpg
 

EvilDrPorkChop

Gas Engineer
Advent Win
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.
 

sammathias

Plumber
Gas Engineer
Installer level, codes in the book. Then p.01 with tap on full. After 10 minutes start p.01 again then take gas rate.
 
OP
Windy
Ok...
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...
 

Harvest Fields

Esteemed
Plumber
Gas Engineer
Advent Win
Didn’t think you could put the hot water on in P1 on the new Vaillant’s? As it is just like running a tap normally?
 

Riley

S. Mod
Plumber
Gas Engineer
I think what they are trying to say is that putting the hot tap on isnt necessarily going to get the boiler working at full rate
 
OP
Windy
I think what they are trying to say is that putting the hot tap on isnt necessarily going to get the boiler working at full rate
but as i have said.... I'm looking at the boiler figures!!!!
The boiler was at full rate and checked correctly
 

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