Viessmann fuel cell / CHP system

Hello everyone,

after diligently searching through the forum, I would like to ask for experience reports / opinions on the CHP system from Viessmann (Vitovalor 300-P).

Planned is a KFW 55 house in timber frame construction / 150m² / slab foundation / gas available.
Massive construction seems to me the jump to KFW 55 is too expensive.

At first, the high investment sum of about 25,000 EUR + installation + energy consultant is quite shocking.
However, looking at the current funding opportunities, it looks a bit better:

BAFA approx. 3,500 EUR
+ approx. 800 EUR from the gas supplier
+ Bavarian 10,000 houses program (technology bonus of about 3,500.00 EUR + if a 3.5-liter house is achieved, there is another 4,500.00 EUR on top.)
+ KFW funding possible (whether it makes sense is another question)
+ Relief on gas costs
+ Electricity generation or usage

So you "almost" get into the range of other heating systems.

Does anyone have experience operating such a system?
Gas consumption values?
Since there is a lot of technology, surely a lot can also break = more expensive maintenance??

Looking forward to comments.

You are then an early adapter, but there will be around 5-6000 € maintenance costs for the next few years. That must not be neglected. If you look at it purely from a cost perspective, you should not acquire a fuel cell.

yes the maintenance costs would definitely be too high....although it is supposedly easy to maintain/should be maintained....+ 10 years warranty (after that it explodes :) and takes the whole neighborhood with it) Does anyone know anything about the gas consumption of such a system?

I only know one model home from Hanse Haus in Oberleichtersbach, where they installed such a heating system. However, it was brand new there, so it is certainly not a reference.