Reading consumption values on Vaillant EcoCompact gas boiler

In our current apartment, this gas boiler is running. Now the gas consumption is to be determined, but apparently, not everything was properly documented. Therefore, my question to the specialists here: Is there an option where I can read off what gas consumption this boiler has had so far, that is, since its installation or flow temperature, even per year? Installation was in 2019. Gas boiler EcoCompact + Multimatic from Vaillant

In newer Multimatic devices, you can read it under Menu → Information → Consumption. For the current month and the previous month as well as since commissioning. Consumption is given in kWh. You would then have to convert this into gas consumption in m3. Unfortunately, not all heat generators forward this information to the control unit. The question is also which Multimatic you have. Actually, the gas meter is important. The billing is based on it and it is also the most accurate. When converting from heat generation (kWh) back to gas consumption, possible losses are not taken into account.

Ok, thanks. I'll also check regarding the exact type as soon as I have the opportunity. It's a somewhat special situation here.... well... our new construction should finally start in the next few days. As long as we can get at least a rough consumption here, that's enough for us, it won't be exact here anyway, but we already knew that or could have guessed it :D. So as always, also a bit self-schooling.