Weishaupt WTC 25 Gas conversion???!!

Hello,
we had a Weishaupt condensing boiler installed, and it is operated with liquefied gas.
Now, after 4 months of operation, the installer found that the conversion (by means of an adjustment screw that only limits the flow?) from natural gas to liquefied gas was not done!!

Question: Can this damage the system???

How does this circumstance affect gas consumption??

We have used about 2300 liters of gas in 4 months!!! For a 150 sqm house built according to the 2009 Energy Saving Ordinance with underfloor heating, that seemed quite excessive to me...
I am grateful for any answers.

Hmm, natural gas is also a liquefied gas!?!? And if you have a liquefied gas system, you generally also have a liquefied gas tank, but then you shouldn't have a gas connection to the local gas network. Am I seeing this wrong? 2300L is pretty heavy, but consumption shortly after moving in and then still in winter is always higher.

Sorry - so we do not have natural gas... - and we have a propane tank installed in the ground.... the conversion is done on the boiler - if it is done. Certainly, with new construction etc., increased consumption must be expected.. - but we used timber frame construction on the upper floor.. - so little moisture was introduced into the process...

I don't know much about this subject, but what exactly is being changed on the system? Natural gas is also a liquefied gas, so what is supposed to change significantly? And if there is a faulty (combustion) setting, you should try to hold the heating engineer liable.

But why on earth are such tanks still being installed today? Are there really still major suppliers for that? Isn't the whole system much more expensive in terms of time compared to installing a heat pump?

Well, we also considered the topic of heat pumps... but then decided on the above-mentioned boiler in combination with a 12.5 sqm solar system due to the lower initial costs... I hope that's not a total mistake... The boiler is supposed to be converted from natural gas to liquid gas, since propane operates at significantly higher pressure and because propane also has a better heating value? I just think that the fact of the higher pressure and the better heating value could lead to increased consumption??? if the conversion is simply not done... Well, maybe an expert in the field will still come up with an answer who can explain this matter better....

What you say about the pressure and the feed-in makes sense and might really be a reason for it.

I have now done a bit of research for myself and am surprised; if the information is correct, even an oil heating system is cheaper at the currently high oil prices, apart from the fact that the liquid tanks are usually rented expensively and tied to a supplier.

But you should really talk to your heating engineer, because 2300l of propane is about 1500l of heating oil, which roughly should be your annual consumption without solar support.
Did you not have a heating load calculation done before the construction? There must have been numbers before!??!
I also find a 25KW system very oversized for 150m²; maybe the system is working inefficiently???
We are currently planning a single-family house with 130m² and underfloor heating, and one assumes a maximum of 8-9KW heating if building to the simplest standard.