ᐅ Which heating system? Requesting recommendations

Folks, folks...

These figures are not just estimates; they come from Malmö, where it is known to be somewhat colder than in Cologne Nippes. Or Stockholm (OK, there we’re already talking about a remarkable difference of 12 kWh). That’s the advantage of having a broader perspective beyond your own backyard.

As for the owners of the many 315 models: it was predictable that this unit wouldn’t work well in the traditional German masonry houses. But to understand why, you need to look at the origin of the device, what it was designed for, and then compare the houses. You will realize that here in Germany, we are a few decades behind. Twenty years ago, we already built better than the current minimum standard of the energy saving ordinance / building regulations.

Unfortunately, that is a fact. And you don’t need to be a physicist to calculate this sort of thing.

Then come forward with facts instead of assumptions. I don’t see any in your post, only unrelated claims. I also don’t see any calculations (numbers just appear out of nowhere). Nothing you write or calculate is understandable; in many places, it’s not even clear what you are trying to say.

Back to the topic:

We had a gas condensing boiler in the old house and now have one in the new house as well. The first one was eight years old at the time of sale two years ago and had no smart thermostat. The difference between the old and the new one is huge! Both are Buderus. This time it comes with a smart thermostat, required by the energy saving regulations, but it’s not as bad as often described.
We are very satisfied. We have been living in the house for seven months now.
A consumption of just under 10,600 kWh/year was calculated for 154 sqm (1,657 sq ft) with a building envelope from the 2014 energy saving regulations (not KfW 70!), and double glazing. Four people, two of whom are young adults who frequently take long showers and baths and need at least 21°C (70°F) in their rooms because constant use of their PCs and gaming consoles cools their bodies down. 😉
Despite the heating-up phase and screed drying, we will not come close to reaching this consumption value after one year of use.

Heating remains a matter of intuition combined with personal preferences.

Our favorite then and now: a micro combined heat and power plant. 🙂 Maybe our next heating system. 😉

Hello

I have never understood the concept of the exhaust air heat pump.
You make the building airtight and windproof, then cut holes in the exterior walls to use the interior of the building as a heat source for heating it.
Congratulations to whoever invented this contraption.

Olli

Again: take some time to understand why this device was developed (namely at a time when the concept of residential ventilation was not even known here in Germany!), where it was developed, and under what conditions these devices were used. Only then can you contribute to the discussion. Simply saying “that won’t work” or “I’ve read otherwise” doesn’t help anyone. And regarding the numbers, Saruss: look them up online, but you will have to take the language course yourself—I can’t help you with that as well.

Rübe1 schrieb:
Once again: focus on why this device was developed (namely at a time when there was no awareness of mechanical ventilation systems in residential buildings here in Germany!), where it was developed, and under which conditions these units were intended to be used—then you can join the discussion. Simply saying “this won’t work, but I read somewhere it does” doesn’t help anyone. And the figures, Saruss: look them up online, but you’ll have to take the language course yourself; I can’t help with that.

I simply doubt all your statements. Even in my parents’ house, they already understood what mechanical ventilation systems are (which was important because their living space is in the basement/on a slope), and this type of heat pump hadn’t been developed yet.

We have been carefully examining the conditions under which these devices can and should be used, if you would just read everything, and we repeatedly find that people want to install them in buildings where these conditions are not met—and we advise against it! It’s not just about whether it works, but also how efficient it is. Direct electric underfloor heating works too—my sister is currently living in an apartment with that—but for my entire house, I use SIGNIFICANTLY less energy for heating...

You need to leave behind your lack of objectivity to be able to contribute meaningfully. Besides, I’ve checked online, and the regulations in the countries you mentioned are not nearly as strict as you claim. So far, your posts have not been helpful at all; it would be useful if you presented all essential facts and information clearly and objectively to assist the user asking the question, rather than throwing out unrelated snippets. And if someone needs to take a language course to understand your points, that’s not helpful either.