Gas condensing boiler or LW heat pump for water-bearing fireplace?

We are planning a new building (approx. 180m²) (KfW70) and have been considering for a long time which primary energy source we should use. In any case, it includes
- underfloor heating everywhere
- controlled residential ventilation (current favorite: Buderus HRV)
- hydronic fireplace (Wodtke Giro, 8KW with buffer storage)

Since we like wood heat, it is no problem to absorb cold peaks in winter, which can become expensive with the heat pump.
Nevertheless, a heat pump costs a few thousand euros more to purchase, and the heat pump tariffs from electricity providers are disappearing. And at 27 cents/kWh, that is not cheap.
On the other hand, we first have to have a gas connection installed (despite the new housing estate, 1800€!), and you pay a basic fee on top of the cheap gas, plus you need another chimney shaft through the entire house, which must be planned and built.
At the moment, we are undecided... My brother-in-law is a heating engineer, does not want to interfere (he would tend towards gas) and works at Buderus, which is why we get good (!) discounts there, no matter what we choose. That means the brand is basically fixed.
Is the Buderus heat pump (indoor or split?) a good idea together with the Buderus HRV residential ventilation? Or is gas better?

Hello,

......
- underfloor heating everywhere
- controlled residential ventilation (current favorite: Buderus HRV)
- hydronic fireplace, (Wodtke Giro, 8KW with buffer tank)...

As in all other cases, a preliminary investigation must first be carried out. => actual demand (capacity, energy) for heating and hot water. Only then can reliable conclusions be drawn and a suitable concept found. Until then, everything is merely assumptions and speculations without background!

.... Since we like wood heat, it is no problem to absorb cold peaks in winter, which are expensive with the heat pump.

With well-designed air heat pump systems, the few hours per year of lower outdoor temperatures usually hardly play a role, depending on location and energy demand.
Example:

In my planning, I always take location-specific climate parameters into account!

.....Nevertheless, a heat pump costs a few thousand more upfront and the heat pump tariffs from electricity providers are disappearing...... And at 27 cents/kWh that is not cheap....

Gas condensing boiler plus connection often match the cost of a suitable air heat pump. With gas, a second heat generator is generally required to comply with the Energy Saving Ordinance/KfW or EEWärmeG requirements. With a heat pump, you can cool; with gas, you cannot!

.... That means the brand is basically fixed....

And what if the devices hardly or not at all match the specific requirements? What is the discount actually worth then?
Wood usually only makes sense if it is permanently available for free. However, then one should be consistent, e.g. wood gasifier.
With hydronic fireplace stoves, the air-side output is often a problem in new buildings (overheating of the installation room). It is often forgotten that the manufacturer’s power specifications apply only to a defined operating point.
You get as close as possible to the ideal state if only as much energy is produced or provided as is currently needed! The more components involved in heat generation, the more complex, prone to faults, and uneconomical (costs, energy efficiency) it becomes due to partly competing demands. Simply the best!
If energy must be stored thermally, it usually becomes inefficient!

Best regards

Gas condensing boiler + connection often come close to a suitable air heat pump. With gas, a second heat generator is usually required to comply with the Energy Saving Ordinance/KfW or EEWG requirements. With a heat pump, you can cool; with gas, you cannot!

Since we do not bury ground probes or anything else, there will probably be no cooling option for us. The garden is terraced several times, etc.
However, to my knowledge, there is an inexpensive—less efficient—solution where you only lay a kind of "water coil" once around the house. I still know too little about that.

And what if the devices hardly or not at all fit the specific requirements? What is the discount actually worth then?

I honestly cannot imagine that the saving effect with another manufacturer is so large that it exceeds the saving effect. I get all heating elements (starting from the stove to heat pump/gas condensing boiler, all pipes, etc.) with a 30-40% discount + installation at cost price. But only with Buderus, because he works directly there—and that is not a bargain brand.
Besides, I already attached the question which of the available models there would be interesting.

Wood usually only makes sense if it is permanently available for free. Then you should be consistent, e.g., wood gasifier.

The wood stove is included solely for the coziness. It does not necessarily have to pay off. I like to put wood in and watch the fire.

With water-bearing stoves, the air-side output is often a problem in new buildings (overheating of the installation room). It is often forgotten that the manufacturer's power ratings apply only for a defined operating point.
You get as close as possible to the ideal state when only as much energy is generated or provided as is currently needed! The more components involved in heat generation, the more confusing, prone to failure, and uneconomical (costs, energy efficiency) it gets due to partly competing demands. Simply the best!

Exactly for this reason, we decided on a water-bearing stove. With these, up to 70% of the heat goes into the buffer tank and does not dissipate, because otherwise, you would be forced to constantly open the windows after 30 minutes because the room overheats.
And so, instead of just the living/dining room through the stove, I can heat the entire house (via the water and underfloor heating).
I know that the combination has to make sense. That’s why I ask whether the above-mentioned models from Buderus are sensible, or whether gas or heat pump fits better with my chosen combination of the water-bearing stove.

If energy has to be stored thermally, it is usually inefficient!

Best regards.

Logical. But due to the firm decision for a stove, in my opinion, still the best solution.

Too bad, no more tips on the question of whether gas or heat pump at current prices?

Gas definitely gas... with today's electricity prices, heat pumps only really pay off in passive houses....

Good evening,

Gas definitely gas... with today's electricity prices, heat pumps only make sense in passive houses....

If you are talking about an air-to-air heat pump, I fully agree with you. If you mean an air-to-water heat pump, you should reconsider your statement. Basically, neither one nor the other can be outright recommended or ruled out. Every construction project must be examined individually based on raw numbers.

Therefore, the question from the OP cannot be answered without reliable numerical data – putting aside the usefulness of a water-bearing fireplace.

Rhenish greetings