Heat pump or solar thermal with radiators

You can't badmouth everything that YOU don't like.

No matter who you addressed. Nothing is being badmouthed here. It’s also not about comparing to new construction. Even 50 years ago, they didn’t build like that anymore. There’s a reason for that. I don’t care at all where and how the OP will live. It just has to be clear that it is associated with many restrictions.

The supply temperature must be quite high, around 45-55 degrees I think. If it is -10 degrees outside, the heat pump must then manage a difference of around 60 degrees.

To heat the rooms, I would have a 1 split climate outdoor unit installed with 4 or 5 indoor units at strategically good locations in the building.

But that won’t change the electricity consumption, since the heating load is independent of that. And whether you then also want to open up the entire place from the inside to lay pipes is another question. From experience, I calculate with new radiators around 45-48 degrees supply temperature. That is still tolerable, since most of the time much less supply temperature is needed (the 45-48 degrees only in the really cold winter nights, if those even still exist). And you have to like the blowing air of an air conditioner.

At least then no electricity-guzzling heating rod kicks in and you don’t have too cold rooms, because every degree of supply temperature steals efficiency. At -10 degrees you can also turn on the gas heater, since the efficiency of heat pumps is really poor then.

Yes, the efficiency is no longer that good. But with gas prices it is probably still cheaper. Because up to -15 degrees nowadays no heat pump needs a heating rod (-10 degrees COP about 2.5 at 40 degrees supply, slightly worse at 45 degrees).

Nobody has built like this for 50 years.

The house dates from 1886 and was completely renovated in 2001 according to the Building Energy Act.

You could come back to the original thread again instead of just rambling!

You can go back to the original thread again and not just ramble!

I already said very early on that the heat pump will work with radiators. Where are your appropriate posts? Oh right, you don’t have any :rolleyes:

I already said very early on that the heat pump will work with radiators. Where are your appropriate posts? Oh right, you don't have any :rolleyes:

Yes, she did respond quite appropriately to your nonsense. Math isn't for everyone, you can easily confuse 136 years with 50. Where are ceiling heights of 2.00m prohibited or what restrictions exist? I don't see any condition in my building permit for the change of use that forbids me from living on the ground floor. Your statements suggest that there could be problems (and surely you don't mean the increased amount of plasters that have to be applied to head wounds). Your nickname suggests that you have a lot to do with renovation professionally or privately. I think there will be a lot of knowledge there. But your statements are currently confusing me a lot. Sorry if I'm distracting the thread a bit again here, but I didn't want to leave it standing uncommented.

if you slept poorly or haven't had any coffee yet, then go lie down again before things get personal here. After that, the sun will shine differently, you will read the comments from the renovator again and will have to realize that no nonsense is being passed on here, but well-intentioned experience...

Just stay factual!

Yes, she did respond appropriately to your nonsense.

Not to nonsense, but also not to my post about the heat pump. And not a single suggestion for heating on now five pages.

Where are ceiling heights of 2.00m prohibited?

See the state building codes. They prescribe what is today allowed or approved as living space/habitable room. Normal rooms (no basement, no attic) are usually around 2.4m. Deviations downward and upward are possible.
In NRW it even says explicitly: "There are concerns regarding usability, especially for health reasons, against falling below a clear height of 2.20 m."
In old buildings, there is non-retroactivity protection. Besides, a ceiling height of 1.99m would also cause the room to be counted as only half living space. Therefore, with the current 2m ceiling height, you have to be careful if, for example, you lay new tiles over the old tiles. Because then you halve your living space...
This is stated again in the living space ordinance.

I see no condition in my building permit for the change of use that forbids me to live in the ground floor.

No new construction. And I do not know exactly what you are remodeling. But your house was built with a valid building permit according to the building law valid at the time. So, like with the OP, all good.

What restrictions are there?

Be it the unergonomic doors (yes, in doubt this means increased paving needs), furniture, and others.

Your nickname suggests that you deal a lot with renovation professionally or privately.

Sort of, needed a new account because you get kicked out here very quickly ;) (even with a total of about 8,500 posts). I have been working in the real estate industry for over 25 years (bank/project development), DIY handyman, small real estate investor and landlord.