Away from fossil fuels - House from 1999

That is generally more efficient. (Brennwertheizungen sollten immer so eingestellt sein, da sie nur so einen Vorteil generieren können.) You just can’t always perfectly regulate everything with old heaters. However, if you manage to do this approximately for one winter, you can very well estimate the heating load and the necessary flow temperature at the standard outdoor temperature. Two important values for heat pump usage. (Eigentlich fehlt dann nur noch das genaue Wissen über die Möglichkeiten der Hydraulik...)

Record daily average temperatures and oil consumption daily.

I understand the temperature part, that's what thermometers were invented for. But how am I supposed to know my daily oil consumption? Then I would have to unscrew the painstakingly sealed tank cap every day to stick a measuring stick in, or install a highly precise sensor. Or a flow meter in the supply line. I only know such things from boating technology...

Matthias

There are different methods – if you don’t have any, of course you can’t do it.
Check if maybe even the heating system counts in some menu.

The best tool for determining the heating load (besides a professional calculation) would of course be a heat meter. You can have that retrofitted, but of course that costs something. Is it worth it? Maybe if there is great uncertainty.

One more thing: If possible, you should set the heating circulation pump to a permanently high performance. Just enough so that the radiators don’t make noise. This also allows for lower flow temperatures, and the heat pump will later have to do the same to efficiently deliver the heat.

We burn about 3,000 liters of heating oil per year (that is 10 liters per square meter including hot water) and use about 8,000 kWh of electricity, as we also charge two electric cars.

Thanks for the roaring laugh on Sunday, burning heating oil to *ROTFL* drive "low-emission" cars! :)

Thanks for the booming laugh on Sunday, using heating oil to generate electricity in order to drive *ROTFL* "low-emission" cars! :)

There is nothing to laugh about. That would actually be more efficient and also more environmentally friendly because a) locally emission-free (good for the local population) and b) corresponding large-scale plants would have better filtering options than a car.

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

Find an energy consultant in the immediate vicinity. They will prepare a concept for you.

..., burning heating oil to generate electricity in order to *ROTFL* drive "low-emission" cars

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