Away from fossil fuels - House from 1999

this is about as original as the electric buses that are running here in test operation.
To heat the passenger compartment, these vehicles have a fuel-powered auxiliary heater inside,
because, unfortunately, the electric drive lacks waste heat for heating.

There are electric buses with diesel auxiliary heaters for very low temperatures, yes. But that’s about it.
The vehicle itself is still many times more efficient, locally low-emission (mostly emission-free over the year), and above all QUIET, which is no insignificant feature in the city.

btw. I don’t know if you knew this, but the "chain letter" on some social platforms regarding the e-bus fleet in Berlin is a hoax. Just as a note in case there happens to be a connection here ;-)

Technological progress doesn’t work at the absolute optimum on the first day. That takes some time, sometimes decades for certain technologies or even infrastructure. The speed at which e-mobility is currently developing is already rather impressive.
The narrow-mindedness of grumblers is, however, sometimes equally impressive.

Pianist, weren't you the one with the difficult property situation at your parents'? How did that turn out?

Well, "difficult" is not the right term. Basically, it's quite simple: until now, everything belonged to my father. In the meantime, after thorough consultation, he has transferred half of all his possessions to his wife, that is, to my mother. This way, eventually two separate inheritance cases will take place, which, with some luck, will each remain below the tax exemption limits. The house that I built and live in is, in any case, considered by the tax office as belonging to me for tax purposes, so nothing arises there. We don't see any further need for regulation. Back to the topic: How would hot water production actually work? It has to be regularly heated to 60 degrees to avoid legionella problems. But a heat pump can't manage that, can it? Does it have to be done electrically then? When I look out the window, I have to conclude that we haven't seen the sun for weeks... Matthias

There are now heat pumps that can reach up to 60 and even 70 degrees. The prevailing opinion here in the forum is that legionella in single-family homes is generally not a problem, with an appropriate storage size, and the users consistently maintain around 46°C. With three people and 300 sqm, of course the storage tank could be correspondingly very large, so there might be problems after all. Then the most sensible solution would still be to simply regularly empty the storage tank and the pipes. So a full bath for the whole family and all pipes open. The water can also be used for flushing/washing or something like that.

So a house from '99 and then 3000 liters consumption is in my opinion very much. My sister also built in '99, living area should be around 160m2 but only 800-900 liters oil + 2-3 ster wood. I would first look where the oil is going.

He heats almost 300 sqm! That’s already okay. No input, no output.

The „mistake“ was already made during the construction in 1999, the missing underfloor heating.

You have already received the right tips!

But a '99 building should also be able to be heated compatibly with a heat pump…

If I look out the window like this, I have to admit that we haven't seen the sun for weeks...

What a pity - especially this week the heat pump is running (almost) from sunrise to (almost) sunset with photovoltaic power and the car can still be charged at noon.

The decision to forgo the underfloor heating was a conscious one at the time. I was told that warmth from below is not good for the body, and that it also stirs up too much dust because warm air continuously rises across the entire surface. Many pipes also run under the screed in my case. If the pipes had been added there as well, it would have caused complete chaos.

Furthermore, relatives at the same time had massive problems with their construction project because the cooperation between the screed company and the heating installer did not go well, and as a result, the screed along with tiles cracked one after another in all rooms accompanied by loud banging noises.

All this together led me to decide to stick with conventional radiators.

Matthias