Air heat pump with fireplace, water-bearing stove, hot water heating

when does an investment with additional costs of approx. €10,000 pay off

In my opinion/knowledge, very, very many air-to-water heat pump owners had to "top up heating" last cold winter... and that with electricity... The first tears came as early as February 2009 because that was when the additional payment bill for 2008 arrived. There will be more tears, as it is known that January to March 2009 was even colder...

But it is also true - if the house is super insulated (all new houses due to the Energy Saving Ordinance 2009 Heat Regulation are mandatory) - you consume very little - e.g. €50 heating costs - no matter what, whether gas, electricity, or wood, and then I would do the math. If heating costs rise by over 100% = in a new building up to €100 (for an old building that would be from €240 to €500 per month, which would lead to a wave of private insolvencies among all homeowners who have a 20-year-old house)...

So a difference between electric operation (air-to-water heat pump vs. gas) is approx. €30 per month = €360 per year = approx. €10,000 in 30 years. Then the investment is recovered. I don’t do it because I can’t calculate it commercially today. BUT if you install (and maybe use) underfloor heating and in 10 years there is hardly any additional cost (a geothermal drilling also costs about €10,000 additional) compared to the gas system, then maybe retrofit.

PS: Without maintenance and filter replacement... I myself am now replacing a 30-year-old gas heating system...

But I have never seen an ELECTRICAL DEVICE or pump older than 10 years with 24-hour operation in (my) house...

I have already read through x forums but have not found a satisfactory answer. I hope someone here can help me:
We are planning a new construction project (single-family house, 130m²) and are now unsure which heating system to choose. Since we plan to mainly heat the ground floor with a fireplace, our idea was to cover the remaining heating demand with an air heat pump (due to lower acquisition costs compared to other heat pump systems). In any case, we want to be independent of gas or oil! Surely you read again and again that air heat pumps are not necessarily the most efficient heating systems, but in our case it will rather be used for “top heating” and hot water supply - or am I mistaken?!
Who has experience with the aforementioned heating system and can possibly recommend an air heat pump? Or who has an alternative suggestion for an AFFORDABLE heating system?
Thanks for all answers!

why should anyone start crying about that?
Air heat pumps are always designed with a heating rod.
It is also known that this type of heat pump does not achieve high annual performance factor values.
Only here, a chimney is available in the question.

A building according to the 2009 Energy Saving Ordinance is by no means "super insulated,"
not without reason the 2012 Energy Saving Ordinance will tighten by about 30% again.
The rules for energy-efficient buildings still apply.

- e.g. 50 € heating costs - no matter what, whether gas, electricity or wood

The energy carriers do not have the same costs or cost increases by far.

So a difference of electricity operation (air-water heat pump versus gas) is about 30 € per month = 360 € per year = in 30 years about 10,000 €. Then the investment is paid off.

and who cares about that, in 30 years no one will be able to pay for gas anymore?

... Since we plan to primarily heat (at least the ground floor) with a fireplace, our idea was to cover the remaining heating demand with an air heat pump (due to lower acquisition costs compared to other heat pump systems).

A fireplace is hardly suitable for permanent provision of heating loads. It is not without reason that the KfW rejects recognition for partial heating load coverage. In my opinion, this is because permanent and sustainable use is not given.

You often read that air heat pumps are not necessarily the most efficient heating systems, but in our case it will rather be used for “additional heating” and for hot water supply – or am I mistaken?!

Air heat pumps lag behind ground/water/soil heat pumps in terms of energy efficiency. However, they have significantly lower investment costs. The economically sensible system for the specific case is found through a cost-effectiveness comparison. Heating and hot water preparation should also be considered together and not separately. Hot water preparation worsens the annual performance factor of the heat pump. Depending on the energy proportion for hot water preparation in relation to the energy consumption for heating, this plays a not insignificant role. In some cost-effectiveness comparisons I have conducted for single-family houses, air heat pumps and gas condensing boilers delivered a “neck and neck” race. Heat pumps require low flow temperatures for heat distribution if operated efficiently, meaning only underfloor heating or fan coils are sensible here. However, then the whole house must be heated. A flexible heating system is no longer possible. Especially for the builder: you won’t have warm feet in the bathroom then! Air heat pumps have other particularities that must be taken into account. Nevertheless, depending on climate location, user behavior, and building insulation standard, they are a viable alternative. Best regards

So, when I read here, there is no enthusiasm for [Luftwärmepumpe].... I still ask the question. House 120 m2, is the [Luftwärmepumpe] worth it?

Depending on the concept, only in a passive house. Because here the air heat pump is only an "emergency heater". Air heat pumps do not have such a poor BAFA funding rating for nothing. Or sophisticated combinations of biomass / exhaust air heat pump / solar thermal energy. See [Institut Wohnen und Umwelt].

How do I calculate the annual performance factor? I have an L-W heat pump from Alpha Innotec in mind with a COP value = 3.5 The system seems suitable for our construction project, I am now just wondering, is this a good L-W heat pump? Are there better ones? Is 3.5 okay now?