Your current heating consumption

KFW classification does not exist as it was built without it.

That then means "house according to the Energy Saving Ordinance" and also says something in connection with the year of construction. However, it could also be a super-duper insulated house without KfW financing. Depending on what you wanted to say

I didn't mean to say anything with that. I only have the primary energy demand of 99.6 kWh/(m²a). As for the RT, I actually start sweating at 21°C...

Quite interesting what a good old oil heating system consumes. Heating system from 2000. Heated area 430 sqm, of which 130 is residential, the rest is commercial or used otherwise. House from 1979, double-walled, subsequently triple-glazed. Annual consumption 2016: 6078 liters. The price was 3000 including tax. 3000 divided by 430 is about 7.10 per sqm. Progress is thus a snail.

I don’t know what’s so great about the oil heating system. You produced about 60,000 kWh of heat with the oil heater (I don’t know how efficiently it now gets into the rooms). With my heat pump, it would have cost me about a thousand less in total than your oil. However, a conversion from oil to heat pump would not be worthwhile due to the investment when replacing. But I doubt whether burning limited resources is overall promising for the future. Economically, however, it can make sense. By the way, progress is purely slowed down by the state - economically. If you look at the state levies, you realize that per kWh of energy for oil you pay 1.44 cents of levies, but for electricity the share per kWh is about 12 cents, so you pay about eight times as much in taxes and surcharges on electric power. If the kWh were only taxed as much as with oil, heating with a heat pump would be much cheaper than with oil.

It's not about oil. It's about a house from 1979. That's what I mean by progress being slow as a snail. Because six thousand liters is really okay for 430 sqm as an annual consumption. Oil has also almost cost one euro per liter, it's very volatile. I wouldn't choose oil again for a new building and I won't do it. Only we will hardly manage to halve our heating costs in the new building.

Hi;

I don't know what's so great about the oil heating. You generated about 60,000 kWh of heat with the oil heating. With my heat pump, that would have cost me about a thousand less in total than your oil.

I'm not quite following the calculation:
Your heat pump is supposed to produce 60,000 kWh of heat for €2000?
Quick calculation: for €2000 you get about 8,000 kWh of electricity. That would be an annual performance factor of 7.5. For that, you would probably need a COP in the range of 9-10 (as an annual average).
Either you found a way to get cheap nuclear power from France, or the heat pump is a perpetual motion machine, or you're sitting on a hot spring...

Realistically, I would estimate the electricity consumption of a heat pump for 60,000 kWh of heat at a minimum of around 15,000 kWh. That would be closer to about €4000 cost...

Or am I missing something here?

Best regards,

Andreas

Just briefly on this: My heat pump actually operates with an annual performance factor above 6 (total electricity consumption of the heating system, including hot water + pump electricity), because in recent years my flow temperature only had to exceed 30°C for a few hours per year (!) (I had my house/borehole generously designed, and it was never really cold for long, at 0°C I am well below that), so 10,000 kWh of electricity, and I would pay about 2000€ for that with my heat pump tariff. However, I also know from other forums people who operate heat pumps (naturally not air ones...) with similar annual performance factors in significantly colder regions, e.g. Switzerland. With a worse overall concept or unfavorable electricity prices, the situation of course looks different.

The mentioned consumption is naturally very good for the size and age. Although – if it is a commercial or craft business in the premises, or if many PCs are located there – one might possibly have to consider other energy contributors as well. (For example, if there are 30 computers, you quickly have a few kW of additional power that also contribute to heating).