Gross and Net. Latent heat? Head scratcher

[Hobo128]

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 question is? If I gas rate an new condensing boiler which uses the latent heat in turn (condensing) and releasing water vapor out the flue do I have to covert from gross - net ?????

 

[chris watkins]

What would the MI's give the output of the new boiler in, Net or Gross Hobo ?? back to the books, LOL

 

[plumber 88]

I thought if the data badge doesn't say gross or net you assume gross then convert to net the new boilers give you it in gross and net on the technical data sheet on installation Manual

 

[kirkgas]

No data badge says gross, old appliances simply state a figure for HI, when they changed they way they calculated it to fall into line with the way the Central Europeans did it they had to let us know what was badged under the new scheme, so the listed the new ones as HI ??kw nett