Construction costs are currently skyrocketing

Please inform yourself, for example, at the Federal Environment Agency, instead of spreading pub talk.

We have just been building, including installing a chimney. And therefore had to deal with it extensively.

A coefficient of performance of 4 or higher with an air-water heat pump is very well achievable if the installer doesn’t mess up the hydraulics. But most only stick to the standard schemes from the manufacturers, meaning buffer tanks, bypass valves, EER, and a run-of-the-mill underfloor heating design from the system provider/wholesaler with 35°C/28°C.

Yesterday I was at the wood specialist store looking for a 25 mm OSB board 67.5 x 2.50 m. There was still one left for 40€ and no resupply in sight; the manufacturer probably reduced production because demand has plummeted...

Well, at Hornbach they have 300 in stock here for 16 euros each, crap compared to the specialist store

Please inform yourself, for example, at the Federal Environment Agency, instead of spreading pub knowledge.

OK, my last post on the subject, since you apparently are not willing or unable to substantiate your statements.

Source: Federal Environment Agency homepage.
Emissions from small combustion plants in residential areas

,,Only untreated wood (firewood, wood chips, pellets, or briquettes) that has been stored long enough is permitted for combustion. ,,
and
,,Burn only suitable fuel, especially only dry, untreated wood. ,,

The statement by was definitely not pub knowledge.

,,Heating with wood causes significantly higher air-polluting emissions even when done properly than other energy sources such as heating oil or natural gas. Therefore, it cannot be ruled out that in some residential areas there may be short-term exposures to fine dust and polycyclic aromatic hydrocarbons (PAHs) – especially when many wood stoves and fireplaces are operated simultaneously in a residential area and inversion weather conditions occur. ,,

It speaks of some, short-term, with many wood stoves, simultaneously and certain weather conditions. I see no mention of:

Poisoning the neighbor’s children and making ventilation impossible in the residential area is therefore okay? The recklessness of some people is simply disgusting.

,,Air measurements commissioned by the ⁠UBA⁠ showed that wood combustion emissions can make a significant contribution to fine dust pollution in residential areas (Baumbach 2013). This specific temporal and spatial ⁠emission⁠ cannot be assessed for health effects because, on the one hand, there are no measurement stations specific to this source and, on the other hand, there is no short-term health limit value (one-hour value) to assess the health impact. ,,

The article is from 2022 but the measurements are from 2013. Since then there have been regulations requiring new heating installations with significantly better emission classes. Again, I read nothing of:

The Federal Environment Agency clearly advises against heating with wood.

,,When emissions from wood combustion add to the baseline pollution in urban areas, or in certain small-scale situations (for example, the entry of chimney emissions into residential rooms of neighboring buildings), applicable limit values for fine dust can be significantly exceeded. ,,

Here I also read "only urban areas," "certain small-scale situations," and "can be exceeded." So far from general statements and warnings.

Regarding this as well:

Fine dust pollution indoors has devastating effects on health.

I can find nothing on that on the Federal Environment Agency’s site.

Only open fireplaces are criticized.
,,Open fireplaces are very inefficient energetically, (...) significantly pollute indoor air with pollutants ,,

But then I come back to the starting point. You generalize and make claims without evidence. Therefore, I will not engage further with you on this topic.

Sorry was curt throughout the day today... ~160sqm according to KFW55, we have central ventilation from Zehnder... The heating engineer said, if I understood him correctly, 6000kwh electricity for heating+hot water... That would probably be around 18000kwh of heat... The local heating (biogas waste heat) costs 9 cents/kwh until 2031 + 416€ basic charge... Operator is a private cooperative... in other words, maximally profit-oriented.

You will never ever consume 6000 kWh! I have a few sqm more, 5 people in the house, KFW55 with controlled residential ventilation, and including cooling in summer (via underfloor heating) we have just half the consumption.

Please inform yourself, for example, at the Federal Environment Agency, instead of spreading pub talk knowledge.

Maybe you should inform yourself at the Federal Environment Agency. The Federal Environment Agency contradicts your statements.

Where I do think, based on what quoted... There's definitely a bit of a vibe of "this really doesn't sound so cool." I read it somewhat as "here and there and somewhere else investigations were done and it was bad, but we just don't have many studies yet." So yes, a blanket "stop that!!!" isn't in the quotes, but neither is an "absolutely no problem" either. (Personally, I'm absolutely not a fan of the fireplace trend in recent years, but I'm also not a fan of pointing fingers, so whatever ;) )