Gas Stove: Wobbe Number, Calorific Value, Heat of Combustion, & Conversion Factor (11.542 kWh/m3)

Hello

I am not a gas boiler service technician (I also need help in this regard - luckily there is a person on this forum who has been helping me recently), but I think I can provide some useful information on this topic.
The settings for gas boilers are given for the furnace expressed as Upper Wobbe Number in units of energy per unit volume, ie [kWh / m3].

The Wobbe number was defined in order to be able to compare the energy produced by different fuels with each other (therefore we now have settlements not in m3, but in kWh).
The relationship between the Upper Wobbe Number ( GLW ) and the heat of combustion ( Cs ) as defined is as follows:

Upper Wobbe Index = (Heat of combustion) / ? (relative gas density)

where relative gas density = (gas_density) / (air_density)

We know that the gas density

Hello

Finally, it is worth adding that what we all have on the invoice and what we pay for, and at the same time we like the least, is the heat of combustion, expressed in [kWh], of gas supplied in a given settlement period.
Summarizing all considerations:

If we have the output heat of combustion Cs in [kWh / m3], we obtain the upper Wobbe number after conversion GLW , which is roughly the following formula:

Cs (we pay for it) -> GLW (we use for boiler settings)

best regards