Gas rating ?

[Deano202]

Hi sorry to but in but does anyone know the allowable tollerences when gas rating an appliance from what it should be to what it is doing surely you can't be expected to hit the mark all the time there must be a 5% or so diffrence I can't find it in my bpec gas book .

 

[neily01]

+- 5% some even say -10% ie vaillant

 

[PETE 123]

From working for north thames gas and over 35 yrs exp se i have understood it to be 5% over 10% under

 

[fast phil]

:iagree: with pete

 

[Danv44444]

I've always gone 10% either way

 

[kirkgas]

There's a Technical Bulletin about this ( prob a few months now) stating 5% over and 10% under being the acceptable range

 

[AWheating]

yep after years of disagreement its been put into writing

 

[stevetheplumber]

I wonder how many plunmbers could actually work out what 5%of 2.87 m2 is

 

[kirkgas]

Me for one

 

[kirkgas]

I also wonder how many plumbers can spell plumber?

 

[Danv44444]

Isn't it just 5% or 10% of the kws?

 

[kirkgas]

Danv can you explain what you are asking?

 

[kirkgas]

Haha Steve your getting pelters from me tonight
I also wonder how many plumbers know to gas rate in m3/hr and not m2

 

[Russell]

Do most of use do gas rating on hot water? Sometimes when a do it on heating mode the ratings are way under? Modulating boiler?

 

[vern]

Do most of use do gas rating on hot water? Sometimes when a do it on heating mode the ratings are way under? Modulating boiler?

Most can be put in test mode to avoid modulation, on heating its all to do with the return temperature, higher it is the gas rate will decrease, hence look at most MI's and you will find 3 different kw ratings for 3 sets of flow and return temps!

 

[kirkgas]

Most can be put in test mode to avoid modulation, on heating its all to do with the return temperature, higher it is the gas rate will decrease, hence look at most MI's and you will find 3 different kw ratings for 3 sets of flow and return temps!

aye right vern, dont start telling us to use the MI's that will just confuse us

 

[RGII79]

gas rating in the republic of ireland and come across people doing it wrong all the time with the different cv from the uk 11 . 3 here whats it over their

 

[Rob Sale]

imperial its between 1035 and 1042 , in metric its 33-40

 

[Mike Jackson]

Being an old timer I'll stick to doing it in imperial, 1/10 and 1/20. None of this modern percentage stuff for me.

 

[Reg Man]

Haha Steve your getting pelters from me tonight
I also wonder how many plumbers know to gas rate in m3/hr and not m2

Class:shades_smile: