Water-carrying fireplace or wood gasifier - experiences?

Hello everyone,

after a long back and forth, we decided against a "prefabricated house" and in favor of a planned house from the architect. A pretty decisive point was that almost all of these rely on heat pumps, but we are not fans of this system (unfortunately, due to the orientation of the house, a photovoltaic system cannot be sensibly installed at our place).

Therefore, we would like to use a gas condensing boiler in combination with a wood gasification boiler or a water-bearing fireplace. We are now very unsure which solution might pay off the most.
We would definitely want a wood stove in the living room...

Regarding the framework conditions:
- New building according to KFW 55
- Living area approx. 175m²
- Construction site Landkreis Lüneburg
- Own forest available (approx. 5ha) with predominantly pine stock

I would like to avoid any fundamental discussion here regarding "Hey, heat pumps are still the best solution"
For us, the above-mentioned solutions are up for selection, only which would be more economical.

Has anyone perhaps gathered experience with these combinations themselves?

Thanks and regards

In any case, you will need a buffer storage tank from which the underfloor heating is fed through a mixer. When it comes to amortization, I am generally very skeptical. This might be more feasible with the wood gasifier due to the higher efficiency.

Hello,

I have the combination of gas and wood gasifier.
There is a 2000l buffer available.
For hot water, there is a fresh water station.

The heated area is about 400m2 with underfloor heating.
However, I also have radiators via a separate circuit in the bathrooms / sauna / hallway.

Hello everyone,

(...)

Definitely have the heating load calculation done (or have it done) and then seriously think about what you can do in your living room with the 5-7 KW airside of the stove when it’s blazing for hours...

In a modern house, the stove easily pushes into one room in 90 minutes the amount of power that the entire house needs for heating and hot water per day...

Neither one nor the other will probably pay off. For space requirements, maintenance, and chimney sweeping, you pay just as much as for the gas. And you still have to buy the stuff.

Therefore: it’s a luxury anyway, so build what you like better and don’t try to make a cost/benefit calculation. That only makes you unhappy.

Just out of curiosity: where would the carburetor be located?

I kind of expected that...
The location of the carburetor would then be the next problem... Can it be easily accommodated in the utility room? Or does it emit too much heat? The size of the room, at about 16m², would actually be sufficient.

Since we want a wood stove anyway, we will probably opt for the water-bearing wood stove