Gas Boiler potential Kwh

Hi,

Just looking at my current non-smart boiler and I think I can probably monitor the cost of heating using HA just like I do with my electricity. So the question is - does anyone know if a boiler that claims to be a 24Kwh boiler (as mine is) actually uses 24Kwh of gas?

I am somewhat confused because surely if I only set temperature to 75c (or there about) and not the 90c it was when it was installed then it’s technically using less gas?

Obviously I can set up my sensor with a 24000w variable to work out usage and cost but just not sure it’s always running at 24Kwh.

Sorry if I am not making any sense :slight_smile:

Anyone looked at this or got any ideas?